428 A. HYATT — TRIAS AND JURA IN THE WESTERN STATES. 



B. pdcljicas ; one with an extremely long guard from Greenwood. There 

 is no data, however, for determining the length of the guard in the true 

 pacificus. The third, if distinct, ought to be a much stouter and larger 

 species than either of these, and is found in the black slates of Greenwood. 

 The fourth form, having a small pencil-like guard, is found in the light- 

 colored slates near Greenwood. 



The specimens of Belemnites pacificus from Spanish Flat in the collec- 

 tion of the University of California are exceedingly poor and agree in 

 this respect with the description given by Gabb.* In the same collection 

 there are three alveoli labelled from Mariposa estate. The labels are the 

 same handwriting, probably Gabb's, and gummed to the specimens, which 

 are obviously the types. 



The specimen from the first ravine west of Hell's hollow, Mariposa 

 county, agree in black color of slates and in the narrowness of the alveoli. 

 A specimen from near Pine Tree lode is evidently a better preserved cast 

 of same. These localities are referred to by Professor Whitney as being 

 the places at which Belemnites had been found in a note to appendix B 

 of Geology of California, volume i. There is also a larger cast of an 

 alveolus labelled from Oregon bar, El Dorado count}^, in a lighter colored 

 slate and 23 millimeters in the greatest diameter, and, as estimated, not 

 over 10 millimeters in the shortest diameter. 

 50W1^ There are two species of Belemnites occurring near Reynolds ferry, 

 opposite Bostwicks bar, Calaveras county. One is narrow and cylindri- 

 cal and may be identical with the similar form from Greenwood, El 

 Dorado county; the other is of the usual shape of ^. pacificus, consider- 

 ably stouter and very likely shorter in proportion. All are fragments 

 -?r^ in a poor state of preservation and the species are not identifiable. In 



'^the dark slates at Stanislaus river, opposite Bear creek, and at the 

 locality six miles from Copperopolis and grade to Angels creek, there is 

 a long cylindrical form which may be the same species as the similar 

 form found near Reynolds ferry, but one cannot be sure beyond the 

 general fact of similarity. 



Dr. Curtice, collecting for the United States Geological Survey, found 

 Belemnites evidently very similar, if not identical species, in the black 

 slates of the American canyon near Greenwood. These remains are not 

 rare, but specimens well enough preserved to be of any use are very rare. 

 In the light-colored slates of the same gulch and immediately above the 

 black slates a fossil was found which is probably the young of this same 

 species or a close ally. The alveolus in part was preserved, but both it 

 and the pencil-like rounded cast of the guard looked quite distinct from 

 the elliptical form of a section of B. pacificus. 



* Proc. Cal. Acad. Sci., Nov 17, 1864., p. 173. 



