existing for approximately 4.2 million years. Syndyoceras was named by Barbour (1905). Its type is Syndyoceras cooki. It was assigned to Protoceratidae by Barbour...

†Symplocos exilis Synaptomys †Syncolporites †Syncolporites minimus †Syndyoceras †Syndyoceras cooki †Syntomostylus †Syntomostylus fortis – type locality for species...

Sylvilagus †Sylvilagus floridanus Synaptomys †Synaptomys cooperi †Syndyoceras †Syndyoceras cooki – type locality for species †Synthetoceras †Synthetoceras tricornatus...

locality for species †Swartzia Sylvilagus Symplocos Synaptomys †Syndyoceras †Syndyoceras cooki Syrphus Tachycineta – or unidentified comparable form †Tachycineta...

Sylvilagus †Sylvilagus floridanus Synaptomys †Synaptomys cooperi †Syndyoceras †Syndyoceras cooki – type locality for species †Synthetoceras †Synthetoceras tricornatus...