Shimer and JBlodgett — Mt. Taylor Region^ JVevj Mexico. 63 



Astarte evansi (II. and M.) Whitfield. 

 (Eep. Geol. Black Hills, p. 413.) 



The individuals of this species are well preserved. The 

 surface ornamentation is usually of broad, concentric undula- 

 tions, separated by narrow interspaces. 



Locality and position, — This species is abundant in the yel- 

 lowish sandy shales along the road five miles southeast of Cabe- 

 zon. It is a fairly good index fossil of the Fort Pierre which, 

 taken with its stratigraphic position, may be sufficient to refer 

 these strata provisionally to the Fort Pierre, even though but 

 this one species was found here. 



Lima utahensis Stanton. 



(Bull. U. S.'G. S. 106, p. 71.) 



Two specimens, an internal and an external mold, are repre- 

 sented in our collections. They agree perfectly with the 

 description in every respect except size, our specimens being 

 less than half as large as Stanton's type, which is from the 

 upper Ivanab valley of Utah. 



Locality and position, — In dark sandy shales of Fort Benton 

 age, one mile southwest of Casa Salazar at Neck 14. Only 

 two specimens were found. 



Cardium pauperculum Meek. 

 (Bull. U. S. G. S. 106, p. 99.) 

 A single well preserved internal mold of this species was 

 found in brownish shales on the eastern side of the road fif- 

 teen miles southeast of Cabezon at locality B. The strata are 

 uppermost Fort Benton. 



f Ybldia subelliptica Stanton. 

 (Bull. IT. S. G. S. 106, p. 94.) 

 A poorly preserved internal mold is referred with extreme 

 doubt to this species. It occurs in a dark brown sandstone at 

 locality B. 



Lucina cf. subundata H. and M. 

 (Bull. U. S. G. S. 106, p. 97.) 



An internal and a poor external mold. Specimens imper- 

 fect. Agree with original description in marginal outline as 

 far as retained, position, shape and prominence of the beaks. 

 Slight traces of concentric striae are present near the margin, 

 but no radiating strise. Shells slightly smaller than those of 

 original description. 



Locality and position, — This species was found associated 

 with Trigonarca depressa at the foot of Neck 3. Age is 

 uppermost Fort Benton or possibly Niobrara. 



