312 Repoet of the State Geologist. 



v. As the shale becomes more calcareous again, the normal fauna 

 (q) returns, and at three feet below the Encrinal limestone 

 becomes fully established once more. Some of the species how- 

 ever did not return, or at least not until the S. Jem ism subfauna 

 became fully established. These are numbers: 2, 13, 15, 34,35, 

 50, 59, 64, 65, 70, 71, 72, 74, 78, 79, 88, 103, 116, US, 131, 133, 

 138, 148 and 161, of the list given under (q). The following 

 new forms characteristic and suggestive of the S. demissa sub- 

 fauna appear : 



66 Cypricardinia indenta. R 



89 Stropheodonta demissa (upper part). R 



101 Chonetes coronata. r 



109 Spirifer granulosus, r 



110 S. audaculus. rc 

 115 S. subumbonus. r 



120 Nucleospira concinna. r 

 124 Atrypa reticularis, rc 



Stictopora incisurata also reappears in considerable numbers. 

 Stropheodonta demissa appears for the first time in these strata, and im- 

 mediately above becomes the dominant form. 



w. The Stropheodonta demissa bed. 



This bed is calcareo-argillaceous, in places forming a solid mass mainly 

 composed of organic remains. Stropheodonta demissa is the most characteristic 

 form, while in many respects the fauna is a return of that characteristic of the 

 middle and upper Pleurodictyum beds and the shales enclosing them. 



The list of observed species is as follows : 



Crustacea : 



f 1 Phacops rana. c 



+6 Primitiopsis punctulifera. r 



Pteropoda : 



13 Tentaculites bellulus. r 



14 T. gracilistriatus. r 

 +16 Coleolus ({) gracilis. R 



Gasteropoda: 



# 18 Platyceras erectum. r 

 19 P. carinatum. rc 



