PALEONTOLOGIC WORK IN 1901 111 



Beecher investigated Phyllocarida and Merostomata from Eodevonian 

 strata. 



Wortman continued the study and description of Eocene mammalia 

 of the Marsh collection. 



Osborn, besides continuing the preparation, study, and description of 

 vertebrate fossils, gave much attention to the general correlation of 

 American Tertiary and mammalian faunas with those of Europe. In 

 conjunction with Matthew he also studied the American Tertiary faunas 

 with reference to their geologic classification, and he was associated with 

 Fraas in a study of the comparative age of American and European 

 Jurassic vertebrate faunas. 



Hyatt has nearly completed a monograph on the Pseudoceratites of 

 the Cretaceous and a monograph on the Endoceratidse and their allies. 

 He has also prepared a table of formulae representing the ontogenies of 

 the principal types of ammonoids forming the genetic stock from which 

 Lytoceras was derived. 



J. P. Smith continued his work on the Triassic faunas of the Pacific 

 coast. 



Matthew was engaged in restudying the Cambrian areas and faunas 

 in Cape Breton. 



Hollick studied the later Tertiary floras of New Jersey and Maryland. 



Walcott continued the preparation of a monograph on Cambrian 

 brachiopods. 



Scott was engaged in the exploration of portions of Patagonia and the 

 collection of vertebrate remains. 



Dean completed a memoir describing new types of placoderms and 

 discussing the systematic position of the Mylostoma. He also began a 

 study of the primitive sharks of the American Devonian. 



GEOGRAPHIC SCOPE OF WORK IN 1901 



The geographic range of the various studies in geology and paleon- 

 tology was practically coextensive with the continent. In the United 

 States the enumeration made has noted local studies in nearly every 

 state and territory. The tracing of geologic boundaries or the mapping 

 of formations was carried on in at least twenty-eight of these political 

 divisions, or considerably more than half. Stratigraphic studies included 

 the measurement and description of sedimentary series, and usually the 

 collection of fossils pertaining to formations, of every geologic period. 

 Collections of fossils for paleontologic study, and especially for the study 

 of faunas, were made from every rock system from Algonkian to Recent. 



How completely the field was occupied in petrography, dynamic geol- 



