270 
Transactions Texas Academy of Science. 
White, Charles A. 
other regionjs; and it also embraced a study of their paleontological char- 
lacteristies. 
“The special ohjeet of this work was to ascertain as clearly as possible 
the relation between the Oretaceous fiorniatioins which loccur in Texiais with 
those which are found to the eastward, westward and northward of that 
region respectively. The result has been in a high degree satisfactory, but 
much yet remains to be done in that connection. 'I was able, on paleonto- 
logical grounds, to correlate the upper formations of the Cretaceous series 
in that part of Texas with the Rotten Limestone and Ripley formations 
of Mississippi and Alabama with an unexpected degree of clearness. 
Besides this, a part of the series beneath these upper formations are now 
regarded with nearly equal confidence as equivalent ' with certain of the 
(formations of western Texas and of the great interior region which stretches 
to the northward. * * 
“From Dallas I proceeded ito Eagle Pass, for the purpose of ascertaining, 
if possible, the relation of the southern continuation of the great Laramie 
group with the marine Tertiary formation of the Glulf coast region. * * 
The strata exposed in the hills about Eagle Pass, which . consist mainly 
of sandstones, but which bear one or more beds of coal there, I had previ- 
ously correlated with the Fox Hills group of the Cretaceous series which 
so extensively prevails to the northward. These strata were found to dip 
gradually in the direction o/f the course of the river and to receive upon 
them those of the Laramie group. The strata of the Laramie group were 
found well exposed along the banks of the Rio Grande, from twenty-five 
to thirty miles above LaredO', where, like the underlying formation, they 
contain one or more workable beds of coal. They also occur on the Mexican 
side of the Rio Grande, where characteristic Laramie fossils have been 
found. 
“These Laramie strata on both sides of the Rio Grande were found to 
dip gently to the southeastward, as the underlying formation had been seen 
to do, and to receive upon them, in the neighborhood of Laredo, sandy 
strata, which bear an abundance of characteristic marine Eocene fossils.” 
431. 
Administraitive Report, Mesozoic Division of Invertebrate Pale- 
ontology. 
Tenth x4nn. Report of the D. S. Gleological Survey, Part I, pp. 
162-165. Washington, 1890. 
Description of the work of this division for the year ending June 30, 
1889. An examination of strata in Baylor, Archer and Wichita counties 
in Texas “which had been reported as bearing a commingling of Paleozoic 
and Mesozoic types of fossils. 
“These strata were found to constitute an important formation, occu- 
pying an area of many thousajid square miles in extent, in western Texas 
and in the Indian Territory. It is the same formation that some geologists 
have referred to the Permian and some to the Termo-Carboniferous,’ and 
upon some geological maps it is represented as of Triasisic age. 
