666 T. W. STANTON 



considerable change. The Comanche fossiliferous zone, here only 

 twenty-five feet thick, rests on ioo feet of coarse gray cross-bedded 

 sandstone which in turn is underlain by 300 feet of variegated shales 

 and sandstones very similar to those of the Morrison on the Cimarron 

 and the Purgatoire. Fragmentary bones of large dinosaurs are com- 

 mon in these shales but none of these collected was sufficiently 

 characteristic to be identified. 



On the north side of Canadian River, fifteen miles northwest of 

 Tucumcari, a similar section is exposed with only twenty feet of 

 fossiliferous Comanche, and this is the last point in this direction 

 at which Comanche fossils were found in place. Farther north and 

 west in the neighborhood cf Sanchez and en the upper course of the 

 Rio Concha, the stratigraphic place of the Comanche is occupied 

 by an inconspicuous shaly band in which no fossils were found. 

 The other members of the section remain practically unchanged. 



An occurrence of Unio previously discovered by Mr. Lee about 

 500 feet below the top of the Red Beds on Rio Concha is worthy of 

 mention as indicating the post-Paleozoic age of that much of the 

 Red Beds. 



Canyon City. — At the end cf the field season I visited the well- 

 known Morrison locality in Garden Park, eight or nine miles north 

 of Canyon City, Colorado. On Oil Creek, below Garden Park and 

 about a mile south of the "Marsh quarry," which has yielded so 

 many dinosaurs, the Dakota sandstone and associated strata are 

 well exposed with a dip of 17 S. E. Guided by the experience 

 gained on the Purgatoire and the Cimarron a brief search in the 

 shaly strata beneath the upper cliff of Dakota sandstone was rewarded 

 by the discovery of plentiful marine fossils that belong to the 

 Comanche fauna. Those collected include Pholadomya sancti-sabae 

 Roemer, a Tapes ( ?), a Lingula and a small mactroid shell, all of 

 which occur in the Kiowa shales of Kansas. The cliffs at this point 

 show the following section: 



1. Rather massive gray Dakota sandstone overlain by Benton 



shale 100 feet 



2. Dark gray shales alternating with thin-bedded sandstones. 



Marine Comanche fossils at 35 feet from top .... 85 " 



3. Massive gray sandstone with bands of fine conglomerate 



near top 35 " 



