94 
TRANSACTIONS OF THE TEXAS ACADEMY OF SCIENCE. 
directly upon the Cisco division and overlaid on the west by the Clear 
Fork division of the Permian. It will therefore he seen that the Wichita 
and Albany divisions were made to occupy the same stratigraphic posi- 
tion. 
At the time these divisions were first described the relationship be- 
tween them could not he determined from the facts then in my posses- 
sion. The area of the Wichita division was known to he Permian, and 
had been somewhat described prior to my giving it the present desig- 
nation. It was embraced in the area known as the “Bed Beds” of 
Texas. In it the invertebrate fossils were partly those known to occur in 
the Upper Coal Measures, and partly those that were characteristic of 
the Permian, in Europe. The vertebrate fossils, which had been found 
quite abundantly in the area, were forms peculiar to the Permian. The 
area was therefore assigned to the Permian without any hesitancy. 
The fossils that had been taken from the area assigned to the Albany 
division were only such invertebrate fossils as had been found in the 
Upper Coal Measures, and no vertebrate fossils had been found. 
Instead of the strata being composed of red clay beds and sandstones, 
as was the case in the Wichita division, they were principally limestones 
and yellowish and blueish clays. In view of these dissimilarities it was 
thought best to describe the two areas under different names, although 
it was thought at the time that it was more than probable that the 
Wichita and Albany divisions were but different facies of the same beds. 
Soon after the publication of my description of the divisions of the 
Coal Measures and Permian in Texas, Prof. Jules Marcou suggested to 
me in a -’•private letter that the Albany division was Permian, and in a 
paper published in the American Geologist, December, 1892, set out his 
reasons for so believing. 
During my recent examinations the true stratigraphic relation be- 
tween the two divisions has been brought out, and I can now say with 
absolute certainty that they are the same in time and belong to the Per- 
mian. 
The Wichita division is now admitted by every one to be Permian. 
This conclusion is based chiefly on the fossils that have been taken from 
the area and which have been described and determined by different 
specialists. 
Prof. E. D. Cope described the vertebrate fossils collected from this 
division, a list of which was published in the Second Annual Beport of 
the Geological Survey of Texas. These fossils show the Permian age of 
the beds as plainly as any one kind of life can show the age of any for- 
mation. 
The invertebrate fossils were partly described by Dr. C. A. White, and 
a list of his determinations was published in the Second Annual Beport 
