34 FLORIDA GEOLOGICAL SURVEY-15TH ANNUAL REPORT

Phacoides waccamawensis delandensis Mansfield. Gafrarium inetastriatumn (Conrad). Gemma trigonia del andensis Mansfield. Mulinia lateralis Say, (2 vars.) Corbula inxqualis Say, (2 vars.)
 Geologic horizon given with the original list: Pleistocene ( ?)
 Geologic horizon believed to be in this report: Pliocene (Nashua marl).

 Following is a list of fossils collected by Mr. F. G. Clapp from onehalf mile north of the railroad station, Orange City, Fla.
 Sta. No. 5011:
Terebra concava (Say).
Oliva literata Lam. var. ? Area transversa Say (?)
Ostrea virginica Gmelin.
Venericardia perplana Conrad. Venericardia tridentata Say. Venus rileyi Conrad.
Gemma trigona delandensis Mansfield. Mulinia lateralis Say.
 Geologic horizon: Pliocene (Nashua marl).

 Sta. No. 5869 (No. 3 of section) and 5634 (No. 1 of section). Marlpit about one mile south of DeLand, Volusia Co., Fla. (For original list of species see Mansfield, W. C., Fla. State Geol. Survey, 11th Ann. Rep't, pp. 113-115, 1918.)
 Geologic horizon: Pliocene (Nashua marl).

 AGE O F THE NASHUA MARL
 The fossils from the type locality of the Nashua marl were identified by Dr. T. W. Vaughan, who makes the following statement' in referring to the geologic age: "Pliocene, [iough] the presence of Pecten madisonius suggests the presence of Mioce.-e in the same bluff. The fauna has an additional interest in containing species found in the 'Waccamaw beds' hut not in the Caloosahatchee." The present writer believes this Pecfen is P. eboreus var. solaroides Heilprin, a Pliocene variety found in the Caloosahatchee marl. Another form is listed, Mulinia congesta (Conrad), which is believed to be closely allied to M. caloosaensis Dall. Even granting that this variable species (Mulinia

 lFla. State Geol. Survey, 2nd. Ann. Rep't, p. 130, 1909.