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The Cretaceous deposits of the Atlantic and Gulf Coastal Plain are separated from the overlying Eocene and younger formations by an unconformity <;>f regional extent. Several authors, including Harris/ Dall,2 Vaughan, and Hill and Vaughan, 4 have briefly described this unconformity and have stated some of the important facts in regard to the differences exhibited by the faunas on the two sides of the contact. The magnitude of these differences, however, has not been sufficiently appreciated by geologists, notwithstanding the published statements of the authors cited. Eighteen years ago Harris wrote with reference to the Gulf region:

The Cretaceous-Eocene contact in the Atlantic and Gulf Coastal Plain