THE COMANCHEAN PERIOD 



741 



The Comanchean faunas are said to represent three distinct 

 facies, the reef facies, most conspicuous, and the littoral and deeper 

 water facies. 



Fig. 503. FAUNA OF THE SHASTAN SERIES, (chiefly Knoxville). a-c Cepha- 

 lopods: a, Lytocefas b&tesli Trask; b, Phyllocefas knoxvillensis Stanton; 

 c, Hoplttes angulatus Stanton. d-h, Gastropods: d, Astresius liratus 

 Gabb; e> Ambefletja dillefi Stanton; /, CeritMum paskentaensis Stanton; 

 g, Hypsipleura gregaria Btanton; h, Turbo mownensis Stanton. i-q, Pele- 

 q/pods: i, Pecten comphxlcosta Gabb; /, Corbula (?) persulcata Stanton; 

 k and I, Aucella piochii var. orata Gabb; m, A. crassicollis Keyserling; 

 n, Astarte californica Stanton; o, Area tehamaensis Stanton; p, Nucula 

 storrsi Stanton; q, Leda glabra Stanton; r, Rhynchonella whineyi Gabb, 

 a brachiopod. (After Stanton.) 



