104 



UNIVERSITY OF COLORADO STUDIES 



FOSSIL CREEK SPECIES 



Two days recently spent at Fossil Creek, near Fort Collins, by 

 Professor D. W. Spangler and the writer, resulted in the collection of the 

 following species, some occurring in abundance, in Fort Pierre beds: 



Margarita nebrascensis 

 Anchura haydeni 

 Lunatia ? sp. 

 Anisomyon 2 sp. 

 Pinna lakesi 

 Inoceramus barabini 

 Inoceramus oblongus 

 Inoceramus sagensis 

 Inoceramus vanuxemi 

 Ostrea sp. 



Volsella meekii 



Pteria linguiformis 



Lucina occidentalis 



Cardium speciosum 



Veniella humilis 



Placenticeras whitfieldi 



Scaphites nodosus 



Baculites compressus 



Algae 



Fucoids 



Other undetermined fossils 



Anomia sp. 



As the same formations occur in this locality, with some of the same 

 species, and the distance between the points is not great, all these species 

 may be expected in the Boulder field. 



Without attempting an exhaustive examination of the literature of 

 the subject, we find scattered through the various reports and proceed- 

 ings references to the finding of the following additional fossil species 

 of invertebrates on the plains bordering the eastern slope of the mountains 

 in Colorado from Denver northward: 



Actason woosteri 

 Actaeonina prosocheila 

 Ammonites sp. 

 Anchura americana 

 Anchura bella 

 Anchura nebrascense 

 Anisomyon centrale 

 Anodonta parellela 

 Anomia Gryphorhynchus 

 Anomia micronema 

 Baculites grandis 



Baroda subelliptica 

 Beaumontia solitaria 

 Bulinus disjunctus 

 Bulinus subelongatus 

 Callista deweyi 

 Campeloma multistriata 

 Cantharus julesburgensis 

 Caryophyllia egeria 

 Chaetetes ? dimissus 

 Chalmys nebrascensis 

 Corbicula augheyi 



