220 



OARBONIFEKOUS FORMATIONS AND KATJNAS OK COLOKAUO. 



same geologic a^c uiul agri'c with tiio stratigniphic evidence wiiicli iissij^ns tliciii to 

 tilt' sniuc t'onuation. Tiikeii as a whole, this fauna is closely related tn lliat of the 

 San Jiuui region, and like it is allied to the Waverl}' fauna of the Wasatch limestone 

 and the IMadison limestone. >sine of its fifteen sjjecies occur in the San Juan region, 

 while the others are found associated with the San Juan species in other areas. 



ASPEN DISTRICT. 



The Aspen collections are very scant}'. They were obtained from the Lead^ille 

 limestone in that vicinitj' by Mr. Manuel and A. Lakes, and were originalh' examined 

 by C. D. Walcott, whose identifications, quoted from Lakes's papei"," are as follows: 



1. Syringopora sji. Turtlfout Park, Aspen Mountain. 



2. Zaplirentis sp. Turtleout Park, Aspen Mountain. 



3. Sponges in oolitic limestone. Head of Keno Gulch, Asjien Mountain, above the " (irand Pacific" 



mine. 



4. Pleurotomaria sp. Turtleout Park, Aspen. 



5. Straparollus sp. Turtleout Park and Frying Pan. 



6. Euomphalus sp. Frying Pan Creek, near Aspen. 



The following table, based upon my own determinations, shows the local farinas 

 and the specific distribution: 



T.\BLE III''. — Table shovAng dutributmi of Missisdppian species in the LeadviUe limestone ofilie Aspen 



district. 



Total. 



Zaphrentis ? sp. a 



Syringopora aculeata . 



Produclus cf. pustulosus. 



Straparollus ophirensis . 

 Straparollus utahensis . . 

 Loxonema ? sp 



CCELE.NTEBATA. 



BRACHIOPODA. 



GASTEROPODA. 



r.) 



(■) 



2 



(?) 

 1 



The geologic age of this fauna is not entirely apparent independently, though it 

 contains suggestions of the Waverly faunas of the Wasatch Mountains and the Yel- 

 lowstone National Park. As it occurs at the same horizon (in the Leadville lime- 

 stone) as the more extensive faunas of the Crested Butte and San Juan areas, their 

 evidence can safely be employed to supplement that which is intrinsic. 



•.Colorado State School of Mines, Bienn. Eept. for 1886, 1887, p. 60, 



fe For a description of the localities indicated by number in this table see locality register, pp. .519-.532. 



