I9°3-] Gidley, Fresh-water Tertiary of NortJnvesterti Texas. 62 I 



gidleyi (No. 106 71, American Museum Collection) subsequently 

 described by Dr. W. D. Matthew.^ 



The creeks have cut deeply into the underlying strata of the 

 Triassic in this locality, and erosion has entirely obliterated the 

 Miocene deposits from many of the divides. 



The deposits that remain in this vicinity differ greatly in 

 character from the exposures along Barton Creek and to the 

 west. They represent much more the appearance of the 

 underlying red beds of the Triassic, from which the materials 

 composing them are apparently derived. 



Finishing the work at this locality the party made a second 

 visit to the Blanco beds at Mount Blanco. Except for a few- 

 days of fruitless search in the vicinity of the mouth of Tula 

 Canon, the remainder of the time was occupied in a second 

 careful examination of the deposits at this place and in ex- 

 ploring Blanco Canon to its mouth. The most important 

 specimens found on this second trip to Mount Blanco were the 

 Glyptodon specimen referred to above and a new species of 

 Platygonus, since described by the writer^ (Platygonus texanus, 

 No. 10702, American Museum Collection). 



Returning to Clarendon, practically by the route taken the 

 year before in going from Clarendon to Mount Blanco, the 

 three years' work in northwestern Texas was at an end. 



Geological Notes. 



Professor W. F. Cummins, in the very complete and interest- 

 ing reports of his explorations in northwestern Texas, 3 has so 

 fully, and, for the most part, accurately described the general 

 geological character and stratigraphy of the Staked Plains, 

 that an attempt at any such extensive and detailed description 

 here would be an unnecessary repetition of much of Cummins's 

 work. Cope ^ has given detailed descriptions of the fossils, 

 taken from various localities, apparently verifying Cummins's 

 determination of the various beds. It is, therefore, the inten- 



* Bull. Am. Mus. Nat. Hist., Vol. XVI, 1902, pp. 129-136. 

 » Bull. Am. Mus. Nat. Hist., Vol. XIX, 1903. P- 478. 



•Geol. Surv. Texas, 3rd Ann. Rep., 1891 (1892), pp. 129-200; 4th Ann. Rep. 1893 



(1893), pp. 179-238. . , ,T O • 



* Geol. Surv. Texas, 4th Ann. Rep., 1892 (1893), pp. 11-S7. Proc. Acad. Nat. Set. 

 Phila., Vol. XLV, 1894. PP- 63-6S. 



