230 The American Geologist. April, is; 4 
semireticnlalvs and Spirifem Hneata,wxd the Bass ranch local- 
ity in Shasta county, are in the ( alaveras formation, as is also 
presumably the locality on the McCloud river near Baird 
P. O. 
Dr. Gabb* gives the following fossils from the Bass ranch 
locality : 
Fusulina robusta. Rhynchonella. 
Fusulins gracilis. Spirifera lineata. 
Fusulina cylindrica. Spiriferina. 
Lithostrotion. Retzia compressa. 
Clisiophyllum u ; 1 1 > 1 > i . Euomphalus whitneyi. 
Productus semireticulatus. Orthis. 
Mr. Walcott is of the opinion that the above assemblage of 
fossils indicates the Lower Carboniferous. 
The term "Calaveras formation" was first used in prim in the Amer- 
ican Geologist (vol xi, p. 309), and the definition was modified in 
the nexl issue (June, 1893). Fusulina lias been found by the 
writer near Elite's Cove, on the south fork of the Merced river, in lime- 
stone that is a pari of the ".real limestone hell of the Gold Belt. The 
large limestone masses of this bell at Sonora, Murphy's, Cave City, Vol- 
cano, and on McCOrmick's ranch nine miles east of Plymouth, are all 
nearh in a line and pretty surely of the same age. Rounded crinoid 
stems have been found al several of the above localities, bul the fossil 
which indicates with certainly the age of the belt to he Carboniferous 
is the Fusulina near Hite's Cove. 
Fuxulina, crinoid stems and some -other fossils were obtained by Mr. 
( '. 1). Vo\ and by the writer from the limestone belt of the Bear moun- 
tains, mostly in the northward continuation of this belt in Calaveras 
and Amador count ies. Mi-. T. W. Stanton and myself collected Fusulina- 
and other fossils from limestone south of Onion valley creek in Plumas 
county, abQUl three and a half miles up-stream from the mouth of the 
creek, and Mr. Stanton collected some from limestone mi Spanish creek 
one mih' east of Spanish Ranch P. < ). 'Phis lasi discovery is interest- 
ing, as the limestone forms one of the outcrops described b\ Mr. .las. 1"]. 
Millsf as of Mesozoic age. The Calaveras formation has also been rec- 
ognized b\ Mr. Lindgren al a number of points in the American river 
drainage. There is little doubt that it comprises perhaps the larger 
pari of the sediments of the auriferous slate series. 
Little Grizzly Creek Beds. 
At the southwest base of Mt. [ngalls, by the road to the 
Cascade gravel mine and to the cast <d' Little Grizzly creek, 
there occurs a highly metamorphic tuff, in a fine-grained por- 
tion of which are recognizable fossils. 
* Paleontology of California, vol. i. pp. 1-1<>. 
tHuII. Gool. Soc. Am., vol. 3, p. 428. 
