1903.] Gidley, Fresh-water Tertiary of Northwestern Texas. 6 1 9 



Paloduro Canon, then to Amarillo and back along the Hne of 

 the railroad. 



. Expedition of 1900. 



The writer was accompanied on the second expedition by 

 Mr. Hans W. Zinsser, of Columbia University, who proved 

 both a valuable assistant and agreeable companion. 



A little preliminary work was done this year at the old 

 locality north of Clarendon, but the main object of this ex- 

 pedition was to explore the eastern escarpment of the Staked 

 Plains south from Silverton, and especially to examine the 

 Blanco beds at Mount Blanco. Accordingly the party, leav- 

 ing Clarendon July 26, 1900, started southwest, taking nearly 

 the route followed the previous year as far as the main divide 

 between Mulberry Creek and South Fork of Red River, then 

 crossing the South Fork of Red River, several miles west of 

 the crossing point of the previous year, ascended the steep 

 escarpment to the top of the Staked Plains at a point nearly 

 north of Silverton. Going east about fifteen miles to the 

 point at which the party ascended the previous year, we 

 turned south along the top of the escarpment, examining the 

 bluffs for a distance of forty or fifty miles, then taking a 

 southwest course across the Plains went direct to Mount 

 Blanco. 



The exposures at Mount Blanco are true Pliocene, and, 

 though of small extent, are very rich in fossil remains. The 

 specimens of most importance found at this locahty were a 

 nearly complete skull and lower jaws of Dihelodon mirificus 

 (No. 10622, American Museum Collection), and, the following 

 year, a partial skeleton of a Glyptodont consisting of a nearly 

 complete carapace, tail pieces, pelvis, sacrum, lumbar and 

 caudal vertebrae. This specimen has since been described by 

 Professor Henry F. Osborn,' under the name Glypiothermm 

 texanum, gen. et sp. nov. 



On finishing the work at this place the party went directly 

 north to the head of Rock Creek, where a second excavation 

 was made in the bank or quarry, from which the horse skele- 



' Bull. Am. Mus. Nat. Hist., Vol. XIX, 1903. PP- 491-494- 



