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1559 



TERTIARY FAUNA OF FLORIDA 



Mr. Langdon in 1894 apparently intended to include in his Chattahoochee 

 Group all the strata between the Orbitoidal limestone and the Miocene of Alum 

 Bluff, but, as in many other cases, the progress of discovery indicates that it 

 will be necessary to divide the strata referred to into several groups, and so 

 for the lower portion, first described by Langdon, the name he proposed will be 

 properly retained.* 



In 1892 the writer (still retaining the term Miocene for the Post-Vicks- 

 burgian Oligocene) restricted the Chattahoochee group to that portion of the 

 series included between the nummulitic beds of Heilprin and the Tampa silex 

 beds.f 



The discovery of richly fossiliferous marls on the Chipola River by Dr. 

 Frank Burns, of the United States Geological Survey, and various questions 

 which arose in regard to the correlation of the different beds on the Chipola 

 and Chattahoochee Rivers, led to their investigation by the writer and Mr. 

 Joseph Stanley Brown, of the United States Geological Survey, in 1893, and 

 the results appear in the publications of the Geological Society of America. J 

 It will be noted that the term " Miocene" is still retained in this paper for the 

 strata comprising the Chattahoochee and Tampa Groups. It is not necessary 

 to recapitulate the conclusions of this paper, which have been in the main 

 confirmed by later observations. 



The study of the Antillean beds, which had hitherto been included by au- 

 thors in the Miocene on account of their similarity in fauna to the Oligocene 

 of Bordeaux and Dax in France (anciently called Miocene), led at once to the 

 correction of the erroneous nomenclature hitherto in use by the writer and 

 others in treating of the continental American beds which by their fauna were 

 obviously related to those of the Antilles, and in some prefatory remarks to a 

 paper descriptive of some Antillean fossils the writer adopted the nomencla- 

 ture which he has since used in regard to these beds.§ 



* It is quite probable that Mr. Langdon's valuable contribution to Dr. Smith's Geology 

 of the Coastal Plain was long detained in manuscript before printing. 



t Bull. U. S. Geol. Survey No. 84, pp. 112, 157, 1892. The manuscript of this Bulletin 

 had been submitted for printing more than a year earlier, and it finally went to press in 

 the absence of the senior author, who was engaged in field work on the Pacific coast, 

 which may account for some uncorrected typographical errors which disfigure the volume. 



I Bull. Geol. Soc. Am., v., pp. 147-170, Feb., 1894. 



§ Descriptions of Tertiary fossils from the Antillean region. By R. J. Lechmere 

 Guppy and William Healey Dall, Proc. U. S. Nat. Mus., xix., No. mo, pp. 303-5, 1896. 



