Fossih of the Trinit/ij Division. 15 



Tlie Reqaicnin Q'Caprotina^^) Limestone. — At Granlmry and in 

 southwestern Parker county there is a vast agglomerate com- 

 posed entirely of the sliclls and casts of Rcqmcnia texana Roemer, 

 to which Dr. B. F. Shuniard gave the name "Caprotina lime- 

 stone." Tliis occurs well up in the Glen Rose heds, about one 

 liuiidred feet from their top. There is a similar bed in the 

 ravine near the east foot of IVIount Bonnel, west of Austin. As 

 shown Ijy the writer,* there is another liorizon of Cai)rotina 

 limestone higher in the Comanche Series. 



The Neri.nxa Flags. — The summit of the Glen Rose beds, as 

 seen in Mount Bonnel, consists of alternations of dimension 

 layers of iirm crystalline limestone and pseudo-oolitic marls. 

 Some of these dimension layers in the peak of Mount Bonnel 

 are composed almost exclusively of calcified forms of Ncrvntras. 



III.— FOSSILS OF THE TRINITY DIVISION. 



The licds contain many plant, vertebrate, and invertebrate 

 remains, which occur either separately or in association, as at 

 one locality iij the bed and banks of Palux}^ creek, three miles 

 west of (ilen Rose, Texas. The more sandy basement l)eds, or 

 Trinity sands, are, as a rule, deficient in organic remains, with 

 the exception of silicificd wood and lignite, although occasional 

 vertebrates and invertebrates are found. 



The lower beds of theGlen Rose subdivision abound in inverte- 

 liratc remains, most of which, however, are but liadly preserved 

 casts. The Glen Rose beds also contain occasional plants and 

 vertebrates, especially in their lower portion, where they grade 

 into the underlying sands. 



The upper beds of the Glen Rose Division are less al)undant 

 in fossil remains, and these are very poorly preserved as casts. 

 The plants of the basement Glen Rose beds have been collected 

 by Professor Lester F. Ward, of the United States Geological 

 Survey, and studied by Professor W. M. Fontaine, of the Uni- 

 versity of Virginia. They are now in course of publication in 

 the Proceedings of the United States National Museum. f The 

 small l)ut interesting collections of vertebrate remains, with the 

 exception of a lepidotoid fish in the hands of Professor Cope, 



* First Annn.al Rejiort of the Geological Survey of Texa?, 1SS9, Aus- 

 tin, ISyO, p. 133. 



fProc. U. S. Nat. Mus., vol. xv, pp. — , pis. xxxv-lxiii. 



