66 TOPOGKAPHIC DEVELOPMENT OF KLAMATH MOUNTAINS, [bull. 196. 
eldeania. This genus has not heretofore been recognized in this coun- 
try, but the name was given to similar obscure organisms from the 
Carboniferous rocks of Great Britain. As the form in hand is so 
similar to the British species (M. gregaria) as to be probably identical 
with it, it seems more than likely that the California rocks are of the 
same general age." The Laytonville limestone contains small beds 
of red chert which, under the microscope, is seen to be full of minute, 
simple, round organisms like those of the radiolarian chert. The 
limestone, on the other hand, contains a multitude of forms which 
suggest the foraminifera3 of chalk. The rock is locally gray, but gen- 
erally reddish, and possibty corresponds to the Foraminiferal lime- 
stone described by Prof. A. C. Lawson in his sketch of the Geology of 
the San Francisco Peninsula. ! 
1 Fifteenth Ann. Rept. U. S. Geol. Survey, 1895, p. 419. 
