304 



Report of the State Geologist. 



93 S. nacrea. r 



100 Chonetes lepida. r 



103 Productella spinulicosta. r 



105 Spirifer mucronatus. r 



116 Amboccelia umbonata. r 



128 Camarotcechia Sappho. 11 

 Cryptonella sp. R 



Towards the top all the fossils become rare, though the rock continues 

 the same in lithologic character. 



k. The upper Trilobite bed. 



This is muen like the preceding beds, differing from them mainly in 

 being somewhat more shaly. It contains the following association of species : 



Crustacea : 



1 Phacops rana. c 



2 Cryphaeus Boothi. r 



6 Primitiopsis punctulifera. r 



Caphalopoda : 



10 Orthoceras nuntium. rc 



Pteropoda : 



14 Tentaculites gracilistriatus. r 



15 Styliolina fissurella. r 



Brachiopoda : 



100 Chonetes lepida. c 

 105 Spirifer mucronatus. rc 

 116 Ambocoelia umbonata. r 



The association of fossils in this bed does not differ materially from that 

 of the middle bed, except in that fewer species are present. 



1. Shale and limestone six feet. 



In these beds the fossils, while rare, still indicate the conditions of the 

 Trilobite beds. The following are the observed species : 



Crustacea : 



1 Phacops rana. rc 



6 Primitiopsis punctulifera. r 



