264 
Transactions Texas Academy of Science. 
White^ Charles A. 
the destruction hj the 'Civil War of the work so well begun by Dr. Shu- 
mard, and the limited knowledge then possessed by any one of the general 
geology of North America^ were doubtless the -causes which prevented 
a satisfactory solution of this question.” 
The author’s investigation of the Texas Cretaceous. Field work in 
charge of Mr. 'Eobert T. iHill, chief assistant. The general section of the 
Cretaceous strata of the eastern half of Texas which resulted from these 
labors: Comanche Series — il, Dinosaur Sands; 2, Fredericksburg Division; 
3, Washita Division. Gulf Series — 4, Tim'ber Creek ,Beds; 5, Eagle Ford 
'Shales; 6^ Austin Limestone; 7, Navarro Beds. 
Table showing the equivalency of these formations: Mississippi Section; 
Texas Section; Western Section; Upper Missouri Eiver Section. The 
Mississippi isection is that of Prof. E. W. Hilgard; the Western is a mod- 
ification, 'first proposed by King, of the Upper Mis-siouri riwer section of 
Meek and Hayden. White’s modification. The New Mexico section by 
Prof. Newberry. The Fox Hills group. The separate identity of the 
Dakota group. Facts seem to indicate “that while the greater part of the 
Dakota group, as it is now known, is a non-marine deposit, we ought to 
expect to find it to merge into a marine deposit to the southward. 
“Now, in making comparisons of the Texas Cretaceous rocks with those 
which have been observed in other parts of the continent, we find that the 
whole lOomanche series represents older strata than are included in any 
other published sections of North American Cretaceous except that perhap-s 
of California. The strata of the Comanche series are known to extend 
northward from Texas into the Indian Territory, and some of its charac- 
teristic fossils have been found in southeastern Kansas. Fossils belonging 
to this series have also been found at various points in Western^ Texas and 
• the adjacent southeastern part of New Mexico. They have also been 
found at various points in Mexico, one locality being upon the western 
side of the Sierra Madre in the Mexican State of Sonora. 
“Judging from ull the informatiion that I have been able to obtain, I infer 
that none of the strata of the Comanche series extend beyond the eastern 
boundaries of Texas, nor further northward than southern Kansas. It 
seems probable, also, that while this series is well developed, both faunally 
and stratigraphically, in Texas, it has, or originally had, its greatest devel- 
opment within the region which is now the Eepublic of Mexico.” P. 43. 
Discussion of the equivalency of formation. The Timber Creek beds 
equivalent, at least in part, with the Dakota of the Western and Upper 
Missouri sections; the Eagle Ford shales equivalent with the bluish shales 
or lower part of the Colorado group and stratigraphically with the Tom- 
bigbee sands; the Austin limestone equivalent with the Eotten limestone 
of the Mississippi section; the Navarro beds equivalent with the Eipley; 
and the Fox Hills group of the Western section is recognized in the valley 
of the Eio Grande in West Texas. “Of the present, or former, direct 
stratigraphical continuity of the western Fox Hills strata with their pre- 
sumed equivalents in Eastern Texas, and in the Gulf and Atlantic coast 
regions, present evidence is not so clear.” 
Relation of Fox Hills strata and the Navarro Beds to overlying forma- 
