FOSSILS FROM THE EICHMOND MINE. 43 



to the preservation of fossils are rarely met with, even the calcareous shale 

 presenting but slight indications of them. Not till within 300 or 400 feet of 

 the summit of Prospect Mountain limestone and 2,000 feet higher up in the 

 strata was there any grouping of fossils observed. From this horizon, and 

 extending up to the base of the Secret Canyon shale, numerous localities 

 occur all along the east slope of Prospect Mountain, which present a fauna 

 with much the same grouping at each, and showing a mingling of both 

 Georgia and Potsdam faunas. 



These organic forms occur both in compact limestone and shaly calca- 

 reous beds, and constitute the third and upper fossiliferous strata of Prospect 

 Mountain limestone. The following list contains most of the species col- 

 lected at this horizon in New York Canyon, many of them being found at 

 several localities : 



Obolella (like O. pretiosa). Protypus senectus. 



Lingula manticula. Dicelloceplialus nasutus. 



Agnostus communis. Ptychoparia oweni. 



Agnostus bidens. Ptychoparia occidentals. 



Agnostus neon. Ptychoparia dissiniilis. 

 Agnostus richmondensis. 



From the corresponding beds in Secret Canyon near Geddes and Ber- 

 trand mine, and in a compact black limestone a short distance above the 

 base of the Secret Canyon shale belt, were collected the following species : 



Kutorgina whitfleldi. Aguostus neon. 



Orthis eurekensis. Protypus expansus. 



Stenotheca elongata. Ptychoparia oweni. 



Agnostus communis. Ptychoparia haguei. 



Agnostus bidens. Oleuoides spinosa. 



In a well denned stratified black limestone exposed for several hundred 

 yards on the seventh level of the Richmond mine were obtained the following 



forms: 



Obolella . Agnostus neon. 



Lingula manticula. Agnostus richmondensis. 



Agnostus communis. Ptychoparia oweni. 



Agnostus bidens. 



The finding of this grouping of fossils in the mine is of some special 

 importance as it adds paleoiitological proof to structural evidence to show 



