WH1TE.1 CROW CREEK FOSSILS. 1G5 



if we except YoIscUa {Brachydontes) regularis White, a couple of imx)er- 

 fect examples of which were found amoug those forms. 



jSTo. ought, perhaps, to be properlj'^ subdivided, but, being composed 

 of soft material, it was found nowhere freely exposed. Some of the lay- 

 ers seem to have been of purely fresh- water origin, because^fragments of 

 a species of Unio and one of Campeloma were found there ; wliilc other 

 layers were as evidently of brackish-water origin, because the Ontrea 

 before mentioned was ti-equeutly found in them, though it is not so abund- 

 ant there as in No. 4. Although these fragments of Unio were too im- 

 perfect for specific identification, they Avere sufficient for unuiistakable 

 generic recognition, and their discover^" has especial interest as being 

 the first recognition of that genus that has hitherto been made in the 

 strata of the Laramie Group east of the liocky JMountains in Colorado, 

 although many species have been discovered in strata of that period west 

 of the mountains and in the Upper Missouri Eiver region. 



Nos. 7, 8, 9, and 10 were found exi^osetl only at one locality, in a gully 

 that led down to the creek. Their characteristics are doubtless repre- 

 sented with approximate correctness in the foregoing record of the sec- 

 tion, but they were not without some evidence of having been partially 

 distiu'bed by the valley erosion. Either Xo, 7 or No. 9, or both, probably 

 rei)resents the bed of coal that is worked at Higley's Mine and elsewhere, 

 and is reported to have been worked in this neighborhood also, but I 

 did not find it. The following is a list of the fossils obtained from the 

 difl'erent members of this section : 



LIST OF FOSSILS FKOM THE VALLEY OF GROW CREEK, COLORADO. 



1. Anomia mieroncma Meek. 



2. Anomia gryphorhynch us Meek. 



3. Ostrca glahra Meek & Hayden. 



4-. Volsella {Brachydontes) regularis White. 

 5. Anodonta parallela White. 

 G. Unio "? 



7. Corbicula cleburni White. 



8. Corhicula ohesa White. 



9. Corhicula cardiniaformis White. 



10. Corhicula [Leptesthes) suholliptica Meek & Hayden. 



11. Corhicula (Leptcsthes) fracfa Meek. 



V2. Corhicula {Leptcsthes) macropistha White. 



13. Corhicula {Leptcsthes) planumhona Meek. 



14. Corhula suhtrigonalis Meek & Hayden. 

 1.3. Bulinus disjunctus VfhitQ. 



IG. Bulinus suhelongatus Meek & Hayden. 



17. Physa fclix White. 



18. Goniohasis gracilicnta Meek & Hayden. 



19. Goniohasis nehrasecnsis Meek «& Hayden. 



20. Melania wyomingensis Meek. 



21. Vivipanis prudentia Wbite. 



22. Tulotoma thompsoni White. 



23. Campeloma multistriata Meek & Hayden. 



24. Corydalites fecundum Scudder. 



iS'OTES ON THE LARAMIE FOSSILS OBTAINED IN TILE VALLEY OF CROW 



CREEK, COLORADO. 



No. 1. Anomia micronema Meek. 



This species was originally described l)y Meek in the Bulletin of tlie 

 United States Geological and Geographical Siu^vey of the Territories, 



