MARINE JURASSIC ROCKS IN SOUTHWESTERN TEXAS 815 
purporting to belong to the same fauna had been collected was 
Bluff mesa, upon which Mr. J. A. Taff of the Texas Survey had 
obtained part of the type-material of 77zgonia taffi, the remainder 
being labeled as from the Malone locality. The rocks of Bluff 
mesa having been referred by Mr. Taff to the ‘‘ Washita division” 
(though the fossils he named from them were Glen Rose species) 
there was literary evidence that seemed to connect the Malone 
fossils with the Comanche series. Awaiting further light, they 
were therefore left among the fossils of that series. The 
‘“Washita”’ intended by Mr. Taff included both the true Washita, 
as originally established by Dr. B. F. Shumard under the name, 
Washita limestone, and the Denison formation of Professor Hill. 
I did not, however, feel satisfied with this disposal of them, 
and | determined to reéxamine the matter at the earliest oppor- 
tunity. This came in a journey made to Guaymas, Mexico, in 
the spring of 1895, by my friend, Mr. Robert W. Goodell, who, 
at my request, and assisted by his father, Mr. R. R. Goodell, 
very kindly made a side trip to the Sierra Blanca Mountains 
and the Malone hills to obtain further collections and data from 
those localities. From the Sierra Blanca Mountains, one of the 
localities of Comanche rocks nearest to the Malone hills, the 
Messrs. Goodell brought back many species of Mesozoic fossils, 
all of them apparently from Comanche rocks, most of them 
Washita forms, and many of them profusely abundant, but 
not one of them identical with fossils of the Malone hills. 
The Goodell collections from the Sierra Blanca Mountains and 
the Malone hills not only emphasized the distinctness of the 
fauna of the latter locality from that of the Comanche series, 
but they also settled the age of the Malone fauna. For, from 
the Malone hills they included, besides three of the species 
collected there by earlier explorers, several other forms, all of 
which seemed to be new to science,? and one of which was a 
*Second Annual Report of the Geological Survey of Texas, pp. 719, et seq., and 
Plate XX VII. 
?Since this was written, two of these forms have been found to be probably 
identical with two fossils that have been described from the Jurassic of Mexico. See 
footnote relating to Pleuromya and Lucina. 
