34 
FLORIDA GEOLOGICAL SURVEY-I5TH ANNUAL REPORT 
Phacoides waccamawensis delandensis Mansfield. 
Gafrarium metastriatum (Conrad). 
Gemma trigonia delandensis Mansfield. 
Mulinia lateralis Say, (2 vars.) 
Corbula inaequalis 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 one- 
half 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). Marl- 
pit about one mile south of DeEand, 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) of the NASHUA MARL 
The fossils from the type locality of the Nashua marl were identi¬ 
fied by Dr. T. W. Vaughan, who makes the following statement 1 in 
referring to the geologic age: “Pliocene, [ihough] the presence of 
Pecten madisonius suggests the presence of Mioceie in the same bluff. 
The fauna has an additional interest in containing species found in the 
‘Waccamaw beds’ but not in the Caloosahatchee.” The present writer 
believes this Pecten 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. ealoosaensis Dali. Even granting that this variable species ( Mulinia 
2 Fla. State Geol. Survey, 2nd. Ann. Rep’t, p. 130, 1909. 
