MINER, Circuit Judge.
Defendant-appellant James Zillgitt appeals from a judgment entered in the United States District Court for the Northern District of New York (Scullin, /.), following a jury trial, convicting him of one count of conspiracy to distribute cocaine and marijuana in violation of 21 U.S.C. §§ 841(a)(1) and 846. Pursuant to the United States Sentencing Guidelines (the “Guidelines”), the district court set Zill-gitt’s base offense level at 28 as a result of its finding by a preponderance of the evidence that the drug conspiracy involved a total of 3.25 kilograms of cocaine. This base offense level, coupled with Zillgitt’s Criminal History Category III, yielded a sentencing range of 97 to 121 months’ imprisonment. The district court sentenced Zillgitt to 109 months’ imprisonment.
Zillgitt argues on appeal that his sentence is unconstitutional on two grounds. First, he claims that his sentence violates Apprendi v. New Jersey, 530 U.S. 466, 120 S.Ct. 2348, 147 L.Ed.2d 435 (2000), in which the Supreme Court held that “any fact that increases the penalty for a crime beyond the prescribed statutory maximum must be submitted to a jury and proved beyond a reasonable doubt.” Id. at 490, 120 S.Ct. 2348. Zillgitt contends that because neither the type nor the quantity of the controlled substances charged in Count One of the indictment were submitted to the jury and proved beyond a reasonable doubt, his sentence is unconstitutional under Apprendi.1
Second, Zillgitt argues that his sentence is unconstitutional under United States v. Barnes, 158 F.3d 662 (2d Cir.1998), in which we held that where a jury returns a general guilty verdict on a single count of conspiracy involving multiple controlled substances, the district court must sentence the defendant as if convicted of a conspiracy involving only the substance that carries the lowest statutory sentencing range. Zillgitt contends, following Barnes, that the district court was required to sentence him under 21 U.S.C. § 841(b)(1)(D), the penalty provision applicable to a conspiracy to distribute an indeterminate amount of marijuana, which carries a maximum term of imprisonment of five years, or sixty months. We agree that Zillgitt’s sentence was unconstitutional under Barnes and the cases upon which Barnes relied.
Because Zillgitt did not raise these arguments either at trial or at sentencing, we review his claims for plain error. See Fed.R.Civ.P. 52(b); United States v. Guevara, 277 F.3d 111, 123 (2d Cir.2001); United States v. Thomas, 274 F.3d 655, 666 (2d Cir.2001) (en banc). Applying plain error review, we hold that the district court committed error, that the error was plain, that the error affected Zillgitt’s substantial rights, and that the error seriously affected the fairness and the public reputation of the judicial proceedings.
[132]*132For the reasons that follow, we withhold judgment on Zillgitt’s conviction for thirty days. If the government consents to a resentencing under 21 U.S.C. § 841(b)(1)(D), the statutory provision applicable here to a marijuana-only conspiracy, we will affirm the conviction. If the government does not consent, we will vacate the conviction and remand for a new trial. Should the government elect to retry Zillgitt, any sentence imposed for the crimes charged under Count One of the original indictment will be reduced by the amount of time he has already served. Ohio v. Johnson, 467 U.S. 493, 499, 104 S.Ct. 2536, 81 L.Ed.2d 425 (1984).
BACKGROUND
On December 10, 1993, Zillgitt was charged in a ten-count indictment with various violations of 21 U.S.C. Count One charged conspiracy to possess with intent to distribute and to distribute a quantity of cocaine, a Schedule II controlled substance, and a quantity of marijuana, a Schedule I controlled substance, in violation of 21 U.S.C. §§ 841(a)(1) and 846. The government alleged that the conspiracy started on approximately January 1, 1988, and continued through the time of the indictment. Counts Two, Four, and Six charged Zillgitt with possession with intent to distribute a quantity of cocaine on three separate dates, in violation of 21 U.S.C. § 841(a)(1). Counts Three, Five, and Seven charged distribution of a quantity of cocaine on three separate dates, in violation of 21 U.S.C. § 841(a)(1). Counts Eight and Nine charged, respectively, possession with intent to distribute, and distribution of, a quantity of marijuana, in violation of 21 U.S.C. § 841(a)(1), and 18 U.S.C. § 2. Count Ten, a forfeiture count, charged that Zillgitt and his co-defendants derived proceeds obtained directly or indirectly as a result of their criminal activity in the amount of approximately $100,000, in violation of 21 U.S.C. § 853.
Following trial, the jury returned a general guilty verdict on October 6, 1994 against Zillgitt on Count One, the conspiracy count, and acquitted him on the eight substantive counts. Zillgitt failed at trial to object to the jury charge, or to request a special verdict requiring the jury to determine the type or quantity of controlled substance underlying the conspiracy charge. He likewise failed to raise at sentencing the arguments he now advances on appeal.
At Zillgitt’s January 26, 1995 sentencing, the trial court found, by a preponderance of the evidence, that he had conspired to distribute a total of 3.25 kilograms of cocaine. This finding, together with Zill-gitt’s Criminal History Category III, resulted in a base offense level of 28, which corresponded to a sentencing range of between 97 and 121 months’ imprisonment. Zillgitt was sentenced to 109 months in prison. The court also ordered that Zill-gitt, jointly and severally with his co-defendants, pay $276,000 pursuant to the forfeiture count. On May 3, 2000, Zillgitt filed a notice of appeal.2
Zillgitt subsequently filed a motion for bail pending appeal. On July 28, 2000, the district court denied Zillgitt’s motion. In order to succeed on his motion Zillgitt was required to establish that: (1) he was not likely to flee or pose a danger to the community; (2) his appeal was not for the [133]*133purpose of delay; (3) his appeal raised a substantial question of law or fact likely to result in: (i) reversal, (ii) an order for a new trial, (iii) a sentence that does not include a term of imprisonment, or (iv) a reduced sentence less than the total of the time already served plus the expected duration of the appeal process; and (4) there were “exceptional circumstances” warranting release. 18 U.S.C. §§ 3142(f)(1), 3143(b), 3145(c).
In support of his motion, Zillgitt for the first time argued that under both our decision in Barnes, 158 F.3d 662, and the Supreme Court’s decision in Apprendi 530 U.S. 466, 120 S.Ct. 2348, 147 L.Ed.2d 435, he was likely to prevail on appeal because “by removing the type and quantity of narcotics as factors to be determined by the jury, the trial court unconstitutionally removed from the jury the assessment of facts that increase the prescribed range of punishment to which [he] was exposed.” The district court disagreed, holding that “the failure of the trial court to differentiate between cocaine and marijuana within the jury instructions or to submit a special verdict form to the jury is harmless error.”
The court based this conclusion on its finding that it could locate only one instance in the trial transcript that connected Zillgitt with marijuana, and that the remainder of the lengthy testimony offered by witnesses related to Zillgitt’s involvement in a cocaine conspiracy. The court found, as a result, that the jury would have had no basis to find that Zillgitt participated in a marijuana conspiracy rather than a cocaine conspiracy. Having concluded that Zillgitt failed to establish that his appeal raised a substantial question of law or fact as required under the statute, the court did not address the remaining three requirements.
Zillgitt appealed the district court’s denial of his motion and, by order dated August 20, 2001, we concluded that Zill-gitt’s appeal did, in fact, raise substantial questions of law concerning the validity of his sentence, and remanded the motion to the district court for further findings as to the other three prongs Zillgitt was required to meet. On remand, the district court determined that Zillgitt satisfied the three remaining prongs, and on December 20, 2001, we granted Zillgitt’s motion for bail pending appeal and instructed the district court to set the terms and conditions of his release.
DISCUSSION
I. The Sentence on Count One
Zillgitt argues that his sentence is unconstitutional under United States v. Barnes, 158 F.3d 662 (2d Cir.1998), in which we held that where a jury returns a general guilty verdict on a single count of conspiracy involving multiple controlled substances, the district court must sentence the defendant as if convicted of a conspiracy involving only the drug that triggers the lowest statutory sentencing range. Our holding in Barnes relied primarily on our earlier decision in United States v. Orozco-Prada, 732 F.2d 1076 (2d Cir.1984), where we reached the same conclusion.
A. United States v. Orozco-Prada
In Orozco-Prada, the defendant was charged in a seven-count indictment with conspiracy to distribute and to possess with intent to distribute marijuana, a Schedule I controlled substance, and cocaine, a Schedule II controlled substance (Count One), and various substantive charges involving a money laundering scheme (Counts Two through Seven). Id. at 1079. The jury returned guilty verdicts against the defendant on all counts except Count Three. Id. Because Count One [134]*134charged a conspiracy involving both cocaine and marijuana, a conviction on that count was punishable under different statutory provisions. Id. at 1083.
The statutory provision applicable to a cocaine conspiracy, 21 U.S.C. § 841(b)(1)(A), permitted a maximum sentence of fifteen years’ imprisonment while the applicable provision governing conspiracies involving marijuana, 21 U.S.C. § 841(b)(1)(B), set a five-year maximum term of imprisonment. The district court sentenced the defendant to eight years’ imprisonment pursuant to the statutory provision applicable to a cocaine conspiracy on the theory that the evidence presented to the jury supported the inference that at least some of the money laundered was the product of cocaine sales. Orozco-Prada, 732 F.2d at 1083.
On appeal, w;e found the sentence improper, holding that “in the absence of a special verdict, there was no way for [the district court] to know whether the jury intended to convict [the defendant] for a cocaine-related conspiracy, for a marijuana-related conspiracy, or for a conspiracy involving both drugs.” Id. Adopting the procedure used by two other circuits faced with the same situation, see United States v. Quicksey, 525 F.2d 337 (4th Cir.1975); Brown v. United States, 299 F.2d 438 (D.C.Cir.1962), we withheld judgment on the Count One conviction, giving the government thirty days to consent to resen-tencing under the statutory provision applicable to a marijuana conspiracy, at which point we would affirm the conviction. If the government chose not to consent, we would vacate the conviction and remand for a new trial. Orozco-Prada, 732 F.2d at 1084.3
B. United States v. Barnes
In Barnes, we remanded for resentenc-ing because of precisely the same sentencing error. 158 F.3d at 674. There the defendant was charged with one count of conspiracy to possess with intent to distribute heroin and marijuana, Schedule I controlled substances, and cocaine and cocaine base, or crack, Schedule II controlled substances. Id. at 664. The jury returned a guilty verdict on the conspiracy count, and the district court imposed a sentence of twenty years, the statutory mandatory minimum for a conspiracy to possess more than fifty grams of crack. Id. at 667. The defendant argued that under Orozco-Pra-da he could only have been sentenced as though convicted of a conspiracy to possess with intent to distribute marijuana. Id. at 667-68. We rejected Barnes’s specific argument that he could only be sentenced under the statutory provision governing marijuana conspiracies but agreed that the district court’s sentence was improper. Id. at 674.
We determined that the marijuana provision was not the appropriate sentencing provision because “our review of the record persuade[d] us that it [was] inconceivable that the jury could have convicted the defendant of conspiracy to possess marijuana” because the evidence relating to marijuana “was not only legally insufficient, it was negligible.” Id. at 668. Moreover, although the government had argued in summation that there was sufficient evidence to find that the defendant conspired to possess any of the four controlled substances named in the indictment, on appeal the government conceded that there was insufficient evidence from which a jury could have concluded that he conspired to possess marijuana.4 Id. We [135]*135found instead that there was sufficient evidence for conviction of conspiracies involving heroin, cocaine, and crack. Accordingly, we again withheld judgment, allowing the government to either consent to resen-tencing under the provision applicable to a conspiracy involving heroin — the controlled substance for which there was no statutory minimum sentence — or to retry the defendant.5 Id. at 674.
In Barnes, the government cited numerous cases in support of its contention that Orozco-Prada had since been undermined, if not overruled. Id. at 668-72. In setting forth its argument, the government relied heavily on the Seventh Circuit case of United States v. Edwards, 105 F.3d 1179 (7th Cir.1997).
In Edwards, the defendants were charged with conspiring to distribute cocaine and crack. Id. at 1180. The jury returned a general guilty verdict. At sentencing the district court found that the conspiracy involved both cocaine and crack and imposed sentences based on that finding. Id. On appeal, the defendants argued that their sentences were improper under the Guidelines, the drug statutes, and the Constitution, because, in light of the ambiguity resulting from the general verdict, the district court was required to sentence them as though convicted of a conspiracy involving only cocaine, which the defendants argued would have resulted in a more lenient sentence. Id. Writing for the panel, Judge Easterbrook affirmed the sentences imposed and took issue with our ruling in Orozco-Prada, as well as decisions of four other circuits that reached the same conclusion. Id.
The Supreme Court affirmed the Seventh Circuit’s decision in Edwards because the petitioners’ sentences did not exceed the statutory maximum permitted for a cocaine-only conspiracy. In other words, the district court’s finding that the conspiracy involved crack made no difference in the petitioners’ sentences. The Court noted, however, that
[o]f course, petitioners’ statutory and constitutional claims would make a difference if it were possible to argue, say, that the sentences imposed exceeded the maximum that the statutes permit for a cocaine-only conspiracy. That is because a maximum sentence set by the statute trumps a higher sentence set forth in the Guidelines.
Edwards v. United States, 523 U.S. 511, 515, 118 S.Ct. 1475, 140 L.Ed.2d 703 (1998). This hypothetical describes exactly the constitutional problem of the sentence imposed on Zillgitt. Zillgitt’s 109-month sentence under the Guidelines exceeds the statutory maximum sixty-month sentence permitted for a marijuana-only conspiracy. In Edwards, the Supreme Court rejected the petitioners’ argument, stating that
the sentences imposed ... were within the statutory limits applicable to a cocaine-only conspiracy. Cf. United States v. Orozco-Prada, 732 F.2d 1076, 1083-84 (2d Cir.1984) (court may not sentence defendant under statutory penalties for cocaine conspiracy when jury may have found only marijuana conspiracy).
Id. (additional citations omitted). Thus, the Supreme Court, citing with approval Orozco-Prada, recognized the critical distinction that where a sentencing court makes its own factual findings regarding [136]*136the drugs that are the objects of a conspiracy, it may not impose a sentence, based on those findings, that exceeds the statutory maximum sentence permissible for the other drug that is the object of the conspiracy. It is this distinction that guides our holding here. Additionally, apart from the Seventh Circuit’s decision in Edwards,6 of the seven other circuits that have directly addressed this issue, all seven have reached the same conclusion that we did in Orozco-Prada.7 Thus, in Bames we rejected the government’s efforts to find inapplicable our prior holding, stating instead that “we follow Orozco-Prada and assume that the conviction is for conspiracy to possess the controlled substance that carries the most lenient statutorily prescribed sentence.” Barnes, 158 F.3d at 668.
If we determine that there was sufficient evidence to demonstrate Zillgitt’s involvement in a marijuana conspiracy, we find nothing in either Bames or Orozco-Prada to support a different holding here.
C. Support for a Conviction for Conspiracy to Distribute Marijuana
In both Orozco-Prada and Bames we held that the district court was required to sentence the defendant under the statutory provision carrying the most lenient sentence for which there was sufficient evidence supporting conviction. Orozco-Prada, 732 F.2d at 1083; Barnes, 158 F.3d at 668. Thus, we must determine whether sufficient evidence was presented at Zillgitt’s trial to support a guilty verdict on the basis of his involvement in a marijuana conspiracy.
At Zillgitt’s trial, one witness testified to buying marijuana from Zillgitt on one or two occasions. A second witness, who had served as a confidential informant, testified that he purchased marijuana from Zillgitt “on a number of occasions,” from “around 1983 until 1990,” thereby demonstrating a course of dealing in marijuana spanning a number of years. The same witness further testified that around 1988 or 1989 he began purchasing quarter-pound quantities of marijuana from Zillgitt.
Additionally, the government introduced into evidence a cassette tape on which was recorded separate cocaine and marijuana transactions between the confidential informant and a co-defendant also found guilty under Count One. The government also produced a plastic baggy containing “a sample of marijuana” for identification by a special agent during his testimony. The evidence here supporting a marijuana con[137]*137spiracy is a far cry from that offered in Barnes, which we found, based on our review of the record, to consist solely of “a small amount ■ of suspected marijuana seized at the [gang’s] headquarters ... which other evidence indicated the defendant sometimes visited.” 158 F.3d at 668. We conclude here that there was a sufficient evidentiary basis upon which the jury could have found that Zillgitt conspired to distribute marijuana.
In assessing the possibility that a jury may have convicted Zillgitt of a marijuana conspiracy, we also examine the language of the government’s summation and the district court’s charge to the jury. See id. at 671; United States v. Nicholson, 231 F.3d 445, 454 (8th Cir.2000); United States v. Garcia, 37 F.3d 1359, 1370 (9th Cir.1994). In its closing arguments, the government summarized the marijuana-related testimony offered against Zillgitt. The prosecutor also told the jury that
I am confident that you will ... find the government has proved beyond a reasonable doubt that these defendants entered in a conspiracy to possess with intent to distribute and to distribute marijuana and cocaine. That they possessed with intent to distribute and distributed cocaine on March 18th, March 24th and April 13th of 1993. And that they possessed with intent to distribute and in fact distributed a quantity of marijuana on April 13th, 1993, as charged.
Thus, the government persisted in arguing to the jury that there was sufficient evidence that the defendant participated, at a minimum, in a conspiracy involving marijuana. Moreover, during oral argument on this appeal, the government stated repeatedly that it had presented sufficient evidence supporting conviction for a marijuana conspiracy.
The district court’s charge to the jury lends further support to our conclusion that the guilty verdict could conceivably have been reached by the jury’s finding that Zillgitt participated in a marijuana conspiracy. The court instructed the jury that
to prove its charge of conspiracy, the government must prove that a defendant and at least one other person knowingly and deliberately arrived at some type of agreement or understanding that they, and perhaps others, would distribute or possess a controlled substance — that is the cocaine or marijuana — with the attempt [sic] to distribute it by means of a common plan or course of action.
(Emphasis added.)
In clarifying the elements required for a conviction for conspiracy, the court stated that
a defendant may be shown to be part of a conspiracy to possess with intent to distribute and to distribute cocaine and marijuana without having actually possessed or distributed cocaine and marijuana. The government is therefore not required to prove that a defendant actually possessed with the intent to distribute or distributed cocaine or marijuana in order to establish his guilt as to Count One.
The district court’s sometimes use of the disjunctive (“marijuana or cocaine”) leaves open the possibility that the jury may have convicted Zillgitt of a conspiracy to distribute only marijuana. See Garcia, 37 F.3d at 1370; Newman v. United States, 817 F.2d 635, 638 (10th Cir.1987). That the indictment here is phrased in the conjunctive (“cocaine and marijuana”), does not clarify the ambiguity of the jury’s verdict. See id. at 639 (holding that, despite the indictment’s conjunctive language, the district court’s instructions could have led the [138]*138jury to convict for conspiracy involving a drug carrying a more lenient sentence).
Based on our review of the record— including the evidence presented at trial, the government’s summation, and the charge to the jury — coupled with the government’s insistence at oral argument that there was sufficient evidence on which to convict Zillgitt of a conspiracy to distribute marijuana, we conclude that a jury could have convicted Zillgitt for conspiring to distribute marijuana. Thus, in light of the general verdict, the district court erred under the rule of Orozco-Prada in sentencing Zillgitt to a term of imprisonment exceeding the sixty-month statutory maximum permitted under 18 U.S.C. § 841(b)(1)(D).
II Plain Error Review
We review Zillgitt’s challenge to his sentence for plain error since he failed to raise this objection below. See United States v. Miller, 263 F.3d 1, 4 (2d Cir.2001) (reviewing sentencing errors first raised on appeal for plain error); United States v. Robie, 166 F.3d 444, 455 (2d Cir.1999) (same); United States v. Martinez-Rios, 143 F.3d 662, 675-76 (2d Cir.1998) (same). Although we have not previously had occasion to review for plain error this precise sentencing challenge, we find, as have our sister circuits, that it is subject to plain error review. See United States v. Dale, 178 F.3d 429, 432 (6th Cir.1999); United States v. Fisher, 22 F.3d 574, 577 (5th Cir.1994); Newman, 817 F.2d at 637 n. 1.
We analyze a claim for plain error under the four-pronged test set forth in United States v. Olano, 507 U.S. 725, 732, 113 S.Ct. 1770, 123 L.Ed.2d 508 (1993). See United States v. Thomas, 274 F.3d 655, 667 (2d Cir.2001) (en banc).
[Bjefore an appellate court can correct an error not raised at trial, there must be (1) error, (2) that is plain, and (3) that affect[s] substantial rights. If all three conditions are met, an appellate court may then exercise its discretion to notice a forfeited error, but only if (4) the error seriously affect[s] the fairness, integrity, or public reputation of judicial proceedings.
Id. (citations and internal quotation marks omitted) (alterations in original).
A. “Er\"or ”
The indictment charged Zillgitt with conspiracy to possess with intent to distribute and to distribute a quantity of cocaine and a quantity of marijuana in violation of 21 U.S.C. §§ 841(a)(1) and 846. The rule announced in Orozco-Prada requires that under a general verdict convicting a defendant on a single count of conspiracy involving multiple controlled substances, the district court must sentence the defendant as if convicted of a conspiracy involving only the drug that carries the lowest statutory sentencing range. 732 F.2d 1076, 1083.
For the reasons discussed above, the court was required to sentence Zillgitt under 21 U.S.C. § 841(b)(1)(D), the statutory provision applicable to a conspiracy involving an indeterminate amount of marijuana, which carries a sixty-month statutory maximum sentence. Instead, the court sentenced Zillgitt to a term of imprisonment exceeding that statutory maximum. Thus, the sentence imposed by the district court was erroneous, and the first prong of Ola-no is satisfied.
B. Emr That Is “Plain"
The second prong of Olano is also satisfied. An error is “plain” if it deviates from an established rule that is “clear” or “obvious” either at the time of trial or at the time of appellate review. See Olano, 507 U.S. at 734, 113 S.Ct. 1770; Thomas, 274 F.3d at 666. Our 1984 hold[139]*139ing in Orozco-Prada was well established at the time of Zillgitt’s trial and has been reiterated in opinions of this Court on numerous occasions prior to this appeal. See, e.g., United States v. Stephenson, 183 F.3d 110, 119 (2d Cir.1999); United States v. Moreno, 181 F.3d 206, 214-15 (2d Cir.1999); United States v. Bravo, 10 F.3d 79, 86 (2d Cir.1993); United States v. Underwood, 932 F.2d 1049, 1054 (2d Cir.1991). The district court’s sentencing error was therefore plain.
C. Error That Affects “Substantial Rights”
An error “affects substantial rights” if it was “prejudicial,” meaning that it “affected the outcome of the district court proceedings.” Olano, 507 U.S. at 734, 113 S.Ct. 1770. The defendant bears the burden of demonstrating prejudice. Id. Zillgitt was sentenced to 109 months’ imprisonment, rather than a term not exceeding the 60 month statutory maximum sentence for a marijuana-only conspiracy. Thus, the sentencing error increased Zillgitt’s term of imprisonment by more than 80 percent of the maximum sentence he would have received in the absence of that error. We find this result prejudicial. See Thomas, 274 F.3d at 666 (“It is beyond cavil that imprisonment for an additional 52 months beyond the penalty authorized by Congress, ... constitutes prejudice.”); see also Nordby, 225 F.3d at 1061 (holding that significant increase in sentence constitutes plain error, thereby implicitly affecting the defendant’s substantial rights); Dale, 178 F.3d at 434 (same); Newman, 817 F.2d at 637 n. 3 (same). Moreover, we have recently held that “[i]f the error is a sentencing error, the prejudice is clear.” Guevara, 277 F.3d at 124. We conclude that the plain error here affected Zillgitt’s substantial rights, and Olano’s third prong is satisfied.
The government argues in its brief that Zillgitt’s sentence was not prejudicial, and thus did not affect his substantial rights, in light of the “overwhelming evidence” of his involvement in a cocaine conspiracy. Based on our review of the portions of the record submitted on this appeal, we do not disagree that more, even significantly more, of the evidence presented to show the drug conspiracy related to cocaine transactions than it did to marijuana transactions. We nonetheless find the government’s argument unavailing for a number of reasons.
First, in neither Orozco-Prada nor Barnes did we undertake a weighing of the evidence. Rather, we acknowledged that there was evidence sufficient to sustain convictions punishable under the provisions carrying the higher penalties. See Barnes, 158 F.3d at 670; Orozco-Prada, 732 F.2d at 1083. In Orozco-Prada we cited with approval the D.C. Circuit’s decision in Brown v. United States, 299 F.2d 438 (D.C.Cir.1962), noting that “[i]n that case ... the court found that the record contained evidence from which a jury could have concluded that the statutes with the higher penalty had been violated but nonetheless refused to affirm the district court.” Orozco-Prada, 732 F.2d at 1083-84.
In Quicksey, another case on which our decision in Orozco-Prada relied, the Fourth Circuit did not disagree with the government’s assertion that there was sufficient evidence to support a conviction carrying a higher penalty, but the panel nonetheless found the defendants’ sentence improper. 525 F.2d at 340-41. We conclude that the relevant question is not whether there was sufficient evidence supporting a conviction for a cocaine conspiracy, but rather whether there was sufficient evidence supporting conviction for a marijuana conspiracy.
[140]*140Second, the cases cited by the government in support of this argument are inap-posite. In Neder v. United States, 527 U.S. 1, 119 S.Ct. 1827, 144 L.Ed.2d 35 (1999), the case upon which the government principally relies, the petitioner argued, based on an intervening Supreme Court decision, that the element of “materiality” in a tax fraud charge must be determined by the jury rather than the judge, as had happened in Neder. Johnson v. United States, 520 U.S. 461, 117 S.Ct. 1544, 137 L.Ed.2d 718 (1997), also cited here by the government, involved precisely the same issue. In both Neder and Johnson, the Supreme Court held that the failure to submit the element of “materiality” to the jury did not affect the appellants’ substantial rights in light of the “overwhelming evidence” supporting that omitted element. Neder, 527 U.S. at 16, 119 S.Ct. 1827; Johnson, 520 U.S. at 470, 117 S.Ct. 1544. In those cases, however, the petitioners were challenging the validity of their convictions and asking the Court to reverse guilty verdicts supported by overwhelming and uncontested evidence demonstrating “materiality,” because the district court, rather than the jury, determined this element of the crime charged. In contrast, Zillgitt is not contesting the jury’s verdict.
The problem here, unlike in Neder and Johnson, is that while the jury clearly found Zillgitt guilty beyond a reasonable of conspiring to distribute drugs, it rendered an ambiguous verdict for sentencing purposes. Thus, while the evidence proffered may also support a conviction for a cocaine conspiracy, we cannot tell, in the absence of a special verdict, whether the jury ever made that determination. In other words, the general verdict leaves open the possibility that the jury may have convicted Zillgitt on the basis of the evidence supporting a marijuana conspiracy without ever reaching a conclusion as to, or perhaps even considering, his involvement in a cocaine-only or a cocaine and marijuana conspiracy. See Barnes, 158 F.3d at 671. That is a distinction with a significant difference. The jury verdicts in Neder and Johnson were unambiguous. Those cases did not present the problem that “the verdict ... providefd] no guidance in determining which statutorily mandated sentence [was] applicable.” Id.
Finally, we agree with the Tenth Circuit that “it is [in]appropriate for an appellate court to weigh the evidence in the jury’s stead.” Newman, 817 F.2d at 639. This is based on the fundamental principle that “[a] defendant may assuredly insist upon observance of [the constitutional right to a jury trial] even when the evidence against him is so overwhelming as to establish guilt beyond a reasonable doubt.” Carella v. California, 491 U.S. 263, 268, 109 S.Ct. 2419, 105 L.Ed.2d 218 (1989) (Scalia, J., concurring). Thus, even assuming there was more than enough evidence supporting a conspiracy involving cocaine, we find that the district court’s sentencing error affected Zillgitt’s substantial rights.
D. Notice and Comction of the Plain Error
Once a defendant has demonstrated that a plain error has affected his substantial rights, “the court of appeals has authority to order correction, but is not required to do so.” Olano, 507 U.S. at 735, 113 S.Ct. 1770. The exercise of our discretion to notice and correct such an error turns on whether the error “seriously affeet[s] the fairness, integrity or public reputation of the judicial proceedings.” Thomas, 274 F.3d at 671 (quoting Olano, 507 U.S. at 736, 113 S.Ct. 1770) (alteration in original) (internal quotation marks omitted). We conclude that the plain error in this case seriously affects at least the fair[141]*141ness and public reputation of the judicial proceedings.
Zillgitt’s sentence exceeded by more than 80 percent, the sentence the district court was permitted to impose. We believe that the fairness of the judicial proceedings was “seriously affected” in this case by the magnitude of the increase that resulted from the sentencing error. Moreover, because at the time we granted Zill-gitt’s motion for bail pending appeal, he had already been imprisoned for more than two years beyond the maximum sentence he could have received had the district court not erred, any victory Zillgitt could potentially obtain from our ruling here would be a Pyrrhic one. For these reasons, we find that the district court’s error seriously calls into question the fairness and public reputation of the judicial proceedings. Having satisfied the Olano test, we hold that Zillgitt’s sentence constitutes reversible plain error.
CONCLUSION
For the foregoing reasons, we withhold judgment on Zillgitt’s conviction for thirty days. If the government consents to a resentencing under the statutory provision applicable to a conspiracy to distribute an indeterminate amount of marijuana, we will affirm the conviction and order that Zillgitt, who has already served the maximum time permissible under the resen-tencing but is now out on bail, be permanently released. If the government does not consent, we will vacate the conviction and remand for a new trial. If the government chooses to retry Zillgitt, any sentence imposed for the crimes charged under Count One of the original indictment will be reduced by the amount of time he has already served.