SHUMARD—CRETACEOUS STRATA. 587 
formation is exhibited at many localities in the State. Good 
exposures occur near Austin, and in Grayson, Fannin and 
Red River Counties. According to Dr. G. G. Shumard, it is 
finely developed at Ft. Washita. 
Fossils are extremely abundant in this formation. The 
most common are Holaster simplex, Epiaster elegans (Hemi- 
aster elegans, Shum., and Towxaster elegans, Conrad and Hall), 
Cidaris hemigranosus, Gryphea Pitcheri, (common var. 
and var. G. Tucumcarii), G. sinwata, Marcou (not Sower- 
by), Ostrea subovata ( Ostrea Marshii, Marcon), O. carinata, 
0. quadriplicata, Janira Texana, Janira Wrightii, Inoce- 
ramus problematicus, Pachymya Austinensis, Lima crenuli- 
costa, Terebratula Wacoensis, Turrilites Brazoensis, Ammo- 
nites Texanus, A. Brazoensis, Hamites Fremonti, and Nau- 
tilus Texanus. 
The occurrence of the well known fossil, Inoceramus pro- 
blematicus, in the formation we are considering, places it on a 
parallel with the lower part of No. 3 of the Nebraska Section of 
Messrs. Hall, Meek and Hayden, while the presence of Ostrea 
subovata (O. Marshii, Marcou) and Gryphea Pitcheri, var. 
Tucumcarti, together with the close lithological resemblance 
of the beds, show, in a very satisfactory manner its identity 
art, 7. e. E, F and G of the Pyramid Mount 
Section, referred by Prof. Marcou to the Jurassic Period. I 
U.S, without being able to detect any difference whatever 
. 
of specific value. I have also compared my specimens of 0. 
gone Maru.—This member was examined in Grayson 
ounty by Dr. G. G. Shumard, who describes it as an wane 
tated arenaceous marl, of a schistose structure, with sma 
nodules of iro : : of lignite dis- 
<osatel through it. It has not been recognized south of 
ounty. 
The fossils are In blemati Ostrea, and 
: oceramus problematicus, ¢ 
Plicatula, of undetermined onl 2 It also abounds in rs 
mains, the scales and teeth of which are sometimes ele- 
Santly preserved, 
