WHITE.] CRETACEOUS FOSSILS OF SAGE CREEK. 205 



LIST OF CRETACEOUS FOSSILS COLLECTED ON SAGE CREEK, AN UPPER 

 TRIBUTARY OF YA3IPA RIVER, COLORADO. 



1. Cari/ophi/Uia cfjcria White. 



2. LixfjiUa niiida Meek & Haydeu. 



3. l*tcria liuf/uiformis Evims & Sliiimard. 



4. Inoceramns harabini Morton. 



5. Inoceramns pcrtcnuis Meek & Hayden? 

 G. ^' itcuhi planimarglnata Meek & llayden. 



7. Thetis f circuJaris Meek & Haydeu. 



8. Teredo f (borings in fossil wood). 



9. Anisomyon centralG^iQ,Q]L. 



10. BacttUten ovatiis Say. 



11. iSc((i)hiics nodosits Owen. 



NOTES ON THE CRETACEOUS FOSSILS OF SAGE CREEK. 



The fossils of this list, unless otherwise stated, are described and fig- 

 ured in vol. ix, United States Geological Survey of the Territories. 



1. CaryoiiliijUia cgcria White. 



This species was newly discovered with the fossils of the foregoing 

 list, and is described and figured in another part of this vohinie, to- 

 gether with the only other known species of this genus that has yet been 

 discovered in American Cretaceous strata. The latter was discovered 

 by Professor St. John, in strata of the Fox Hills Group, at Cimarron, N. 

 Mex., and in similar argillaceous strata. This circumstance seems to 

 be worthy of note, in view of the fact that the usual habitat of living 

 corals is in the i)urest waters } and the comparatively pure calcareous 

 strata that inclose mogt fossil corals indicate that similar conditions have 

 always been essential to their abundant growth. Coming, as this species 

 does, from near the top of the series of Fox Hills strata, it adds to other 

 evidence that true marine conditions were continued up to the close of 

 that ei)och. 



2. Lingula nitida Meek & Hayden. 



A single example only of this species was found. Only one other 

 species of the genus has been recognized in the Cretaceous rocks of the 

 West, both having been first discovered in the Upper Missouri Eiver 

 region, and both are rare, but widely distributed. 



3. Pteria Unguiformis Evans & Shumard. 



On a previous page of this report, this species has been noticed at 

 some length. It is widely distributed, and ranges through both the 

 Fort Pierre and Fox Hills Groups, in the Upper Missouri Kiver region. 



4. Inoccramus harahini Mortbn. 



Scarcely any Cretaceous species has a wider range in Western JSTorth 

 America than this. Its vertical range is also through the Fort Pierre 

 and Fox Hills Groups of the Upper Missouri Eiver region, and INIr. 

 Meek has described a variety of it from the ui^permost strata of the Fox 

 Hills Group, at the mouth of Judith Eiver. 



5. Inoccramus pertenuis Meek & Hayden. 



A coui)le of imperfect examples of Inoccramus were found among the 

 other fossils that seem to belong to this species, although it is possible 

 they ma;\' belong to the I. vanuxcml of Meek «& Hayden. The last-named 

 species has been found only in the Fort Pierre Group of the Ui)X)er Mis- 



