[DB 1517 (98)] Ancient riverbeds are very difficult to find and identify for two reasons. The first is that they are often eroded beyond recognition before they are buried, and the second is that they are relatively small compared to the vast size of the geologic strata burying them. For these reasons, we would not expect for very many ancient riverbeds to be discovered. On the other hand, the claim stated here, that no ancient riverbeds exist, is false — some have been found. One example is a riverbed that was found by researchers using seismic "sonar" to search for oil (AAPG Explorer, June 1993, p.14). Within a layer of limestone, 1670 feet below the Texas prairie, the researchers found a meandering channel in which the limestone had been eroded away. In summary, although we do not expect to find many of them due to the difficulties involved, buried ancient riverbeds are known to exist, contrary to this claim.