Sharks represent an interesting problem for uniformitarian paleontologists. They suddenly appear fully formed in the Devonian Period with no apparent ancestors. One shark species in particular, Carcharodon megalodon, is known from its abundant teeth found in rocks which "date" to the uniformitarian Miocene. Some scientists have suggested that the "modern" great white shark (i.e., Carcharodon carcharias) might represent the same shark species as C. megalodon. However, serious questions remain regarding whether these were the same species of shark. While C. megalodon and _C. carcharias_ are clearly within the same genus, they likely should remain as separate species. Many young earth creationists believe that during the Antediluvian timeframe both mankind and animals had longer lifespans than at present. Carcharodon megalodon, like the dinosaurs, are believed to have grown continually until they were killed, either during the catastrophic conditions associated with the Flood event, or they eventually died from old age (possibly post-Flood). Longer periods of growth, proposed for the antediluvian timeframe, could have allowed C. megalodon to grow to its maximum size potential. Other environmental factors might still allow for the possibility that a living C. megalodon might be found in the oceans of the planet.