LOCALITIES NEAR CANYON CITY 563 



On the east side of Grape creek, just above its mouth, there are nearly 

 continuous exposures from the granite to the "Dakota" sandstone. At the 

 base are about 150 feet of massive gray Harding sandstones, pinkish in 

 their upper portion. These are succeeded by about 50 feet of soft gray 

 sandstone, with some layers, 50 feet of limestone (Fremont), 10 feet of 

 red sand and sandstone, and about 900 feet of Fountain Eed beds. 



Fish Eemains and Associated Fossils near Canyon City 

 harding quarry locality 



The fish remains obtained by Mr Walcott, near Canyon City, in 1890, 

 occur in the Harding sandstone, which is closely similar in appearance to 

 the fish-bearing sandstone of the Bighorn formation, as described on a 

 previous page. The principal locality is at Harding quarry, which is on 

 the mountain slope 2 miles west of Canyon City, where the section above 

 described was measured. Here the Harding sandstone lies directly on the 

 gneiss, as shown in plate 78. The vertical range of the fish remains 

 is from about 20 feet above the base of the sandstone to its summit, 66 

 feet higher, and a few occur in the overlying shale (see plate 79). The 

 remains are most abundant in a reddish sandy shale that occurs in irreg- 

 ular bands at several horizons in the sandstone, but they are also irreg- 

 ularly scattered through the latter. The fish fauna includes fragments 

 of a Placoderm closely allied to Asterolepis, numerous scales of the 

 character of those of Holoptychius, and what is considered to be the calci- 

 fied chordal sheath of a form allied to the recent Ghimcera monstrosa. In 

 the sandstone occur numerous remains of invertebrates comprising 11 

 general and 19 species, which are "of the type of the basal Trenton of 

 the New York section." In the Fremont limestone which overlies the 

 thin shale member at the top of the Harding sandstone there is a large 

 and varied fauna which, at a horizon 3 feet above the base, contains 34 

 genera and 55 species. At a horizon 180 feet higher 33 genera and 57 

 species occur. "These faunas are respectively of the types of those of the 

 Lower and Upper Trenton faunas of the New York section." 



The character of the fauna at the lower horizon is shown by Receptacu- 

 lites oweni, Halysites catenulatus, Columnaria alveolata, Strophomena 

 alternata, Streptorhynchus filitextum, S. sulcatum, Orthis biforata, O. 

 flabellum, O. subquadrata, O. tricenaria, Rhynchonella capax var. incre- 

 bescens, R. dentata Hall, Amb onychia bellastriata Hall, Modiolopsis 

 plana Hall, Murchisonia tricarinata Hall, Cyclonema bilcx, Belleroplion 

 bilobatus Sow, Endoceras proteiforme Hall, Ormoceras tenuiftlum, O. 

 crebriseptum, Orthoceras vertebrate Hall, O. multicameratum Hall, Gom- 

 phoceras powersi James, Asaphus like A. platycephalus, Illamus crassi- 



