190 REPORT UNITED STATES GEOLOGICAL SURVEY. 



numerous points on the slope of the valley-side, and not more than four 

 or five feet beneath the base of No. 5, the prairie dogs had, in their bur- 

 rowing', brought to the surface fragments of coal aud carbonaceous shale. 

 This indicates the existence of a bed of coal there, which, if identical 

 with that of the Crow Creek locality, implies an absence in the valley 

 of Bijou Creek of an equivalent of a considerable part of the Crow Creek 

 section beneath its No. 5. But it is more probable that the coal of Bijou 

 Creek is a local development of another bed, which is not represented 

 in Crow Creek Valley where the section was measured, and also that 

 the upper and more fossiliferous part only of the Crow Creek section is 

 represented in that of Bijou Creek. 



LIST OF FOSSILS FROM THE VALLEY OF BIJOU CREEK, COLORADO. 



1. Anomia micronema Meek. 



2. Ostrea glabra Meek & Hayden. 



3. Corbicula ohesa White. 



4. Corbicula (Leptesthes) subelliptica Meek & Hayden. 



5. Corbicula (Leptesthes) macropistha White. 



6. Corbicula (Leptesthes) planumbona Meek. 



7. Corbula,subtrigonalis Meek &' Hayden. 



8. Mclania wyomingensis Meek. 



NOTES ON THE LARAMIE FOSSILS COLLECTED LN THE VALLEY OF 

 BIJOU CREEK, COLORADO. 



All the species of this list were also found in Crow Creek Valley, and 

 they are separately discussed in notes on the fossils of that locality, on 

 preceding pages. Therefore the notes on this list of fossils will be very 

 brief, and the reader is referred to the notes on the same species of the 

 Crow Creek list. 



The examples of Anomia micronema and Ostrea glabra were found 

 quite abundantly at the Bijou Creek locality, but only in bed No. 5 j and 

 no other species were found immediately associated with them. This 

 association of the two species and exclusion of others, in a single stratum, 

 has also been recognized at other localities east of the mountains. 



The four species of Corbicula named in the list were found associated 

 in bed No. 4 of the Bijou Creek section and in none of the others. Frag- 

 ments of Corbula subtrigonalis and Melania wyomingensis were also found 

 associated with them, and all six of these species were found similarly 

 associated in bed No. 3 of the Crow Creek section. The condition of the 

 fossils at the two localities respectively is practically the same, but I 

 observed that the beaks and umbonal portions of some of the specimens of 

 Corbicula obesa were eroded, having apparently been done during the 

 life of the mollusk, as the material of the imbedding matrix filled the 

 eroded cavities. This condition was observed in the case of no other 

 species, nor was it observed upon the same species at the Crow Creek 

 locality, the only other place at which the species is known to occur. 



The whole valley of Bijou Creek, from its mouth to the crossing of 

 the Kansas Pacific Bailroad, was searched for other exposures, but no 

 others were discovered except a few at and in the neighborhood of Bijou 

 Station, where that railroad crosses the creek. These consisted of soft 

 ferruginous sandstone with bluish and variegated shaly and clayey 

 alternating layers. They appear to belong in the series just above the 

 section further down the creek that has already been recorded, or they 

 are perhaps in part identical with No. 2 of that section. 



