CHAPTER VI. 



TERTIARY AND QUATERNARY STRATIGRAPHIC PALEON- 

 TOLOGY. 



By Thomas Wayland Vatjghan and Wendell Phillips Woodring. 



OBJECTS OF THE PALEONTOLOGIC WORK. 



As is stated in the introductory chapter of this volume, one of the 

 objects of the preliminary geologic work done in the Dominican Republic 

 included the collection of fossils that would establish a more accurate geo- 

 logic correlation of the formations in the Republic and that would aid 

 in correlating them with formations in other West Indian islands, southern 

 North America, Central America, and northern South America and in estab- 

 lishing geologic correlations of formations on the two sides of the Atlantic. 

 The large collections obtained during the reconnaissance have been studied 

 in a preliminary way and the information they afford is here presented. 

 The only other collections made in the Dominican Republic that can aid in 

 determining geologic correlations are those obtained by Dr. Carlotta J. 

 Maury and her party in May and June, 1916. l The results of studies by 

 specialists of the Foraminifera, Echinii, Bryozoa, and Crustacea collected 

 by her party, as well as of some stratigraphic information contained in 

 her report, have been used, for by thus combining the results of the studies 

 of the two sets of collections we are able to give a summary of all that is 

 now known of the Tertiary stratigraphic paleontology of the Dominican 

 Republic. The small fauna of the known Cretaceous is discussed on 

 pages 53-55. 



The identification of the fossils has been a laborious undertaking, in 

 which a number of investigators have collaborated. Credit for the deter- 

 minations should be given as follows : Foraminifera, Dr. Joseph A. Cushman, 

 of the United States Geological Survey; corals, Dr. T. Wayland Vaughan, 

 of the United States Geological Survey; Echinii, Dr. Robert T. Jackson, 

 of Peterborough, New Hampshire; Bryozoa, Dr. Ray S. Bassler, of the 

 United States National Museum, and Monsieur F. Canu, of Versailles, 

 France; Mollusca, Dr. W. P. Woodring and Mr. W. C. Mansfield, both of 

 the United States Geological Survey; Crustacea, Dr. Mary J. Rath bun, 

 of the United States National Museum. The few fossil phanerogamous 

 plants were examined by Professor E. W. Berry, of Johns Hopkins Univer- 

 sity. It would possibly be no more than just to give the names of all these 

 collaborators as joint authors of this chapter. In references to fossils 

 given in the following lists the identifications should be credited to the 



1 Santo Domingo type sections and fossils: Bull. Am. Paleontology, vol. 5, pp. 165-459, Pis. 27-68, 1917. 



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