814 eV a GCA GHUNG 
be adopted for America, the entire Comanche series belongs to 
the Cretaceous. 
No true Jurassic of marine origin, therefore, has hitherto 
been recognized in the southern part of the United States." 
In 1893, when studying the Cretaceous fauna of Texas, as 
represented in the museum of the Geological Survey of that 
state, I was led to suspect the occurrence of Jurassic rocks in 
the vicinity of Malone, a flag-station of the Southern Pacific 
railway between El] Paso and Sierra Blanca Junction. The 
evidence of such possible Jurassic formation was derived from 
the study of a small collection of Mesozoic fossils that had been 
obtained by Messrs. W. H. von Streeruwitzand Ralph Wyschetzki, 
according to the field-labels, ‘‘in hills about a mile northeast of 
Malone.”’ The collection, though small, revealed a fauna quite 
different from any known in the North American Cretaceous, 
and one which, it was therefore surmised, might be pre-Comanche. 
All of the material that was deemed sufficient for study was 
treated of in the writer’s ‘Contribution to the Invertebrate Pale- 
ontology of the Texas Cretaceous,” in the Fourth Annual Report 
of the Texas State Geological Survey. It included six species, all 
apparently new to science, which were described under the 
following names: Anatina tosta, Cucullea transpecosensis, Cyprina 
(? Roudairia) streeruvitsi, Trigonia vyschetzki, T. taffi, and Venus 
matonensis. These fossils threw little light on the question of 
Jurassic or Cretaceous age of the rocks in which they occurred, 
as all of the genera were known to be common to both of these 
geological systems, and the two species of Trigonia were regarded 
as presenting features that allied them to both certain Jurassic 
and certain Cretaceous trigonias. The problem was therefore 
left unsolved. 
Besides the Malone hills, the only locality where any fossil 
*The Morrison Formation (Cross) of Colorado and Wyoming was traced along 
the front of the Rockies many years ago by Dr. F. V. Hayden at least as far south as 
Las Vegas, and its occurrence at the latter point has been recently confirmed by 
Professor Alpheus Hyatt. But this, though it has usually been called Jurassic, is now 
beginning to be regarded by some as probably lower Cretaceous (Wealden), and, 
whatever its age, is a fresh-water formation. 
