Maize is claimed to occur occasionally in preceramic deposits in Peru. Cobs, kernels, tassels, pollen, and plant parts have been reported to be associated with Cotton Preceramic period refuse (ca. 2500–1750 B.C., uncorrected) in several north-central coast sites. Maize has been found in some much earlier highland occupations that also have yielded a wide range of ancient dates. These samples represent many types, some with characteristics not found again until late in the first millennium A.D. This arouses suspicion. Checking of artifacts, ecofacts, and radiocarbon dates associated with the maize reveals some that are less than 100 years old and many that are less than 1,500 years old. It also reveals shallow deposits and/or much disturbed context.