182 F\ REPORT OF PROGRESS. E. W. CLAYPOLE. 



r riie following is a detailed section of the Lewistown lime- 

 stone shales as they appear at Clark's mill : 



(a.) Clark's Mill section. {Typical.) 



Yellow Flint beds. 



8' Limestone beds with black chert. 



1' bed with /Strop horn en a. 

 20' with Tentaculites and Brachiopoda. 



\' Coral bed. 



3' Tentaculites gyracanthus. 



3' Tentaculites gyracanthus and some Brachiopods. 



2' 



1' Coral— Trematopor a— solid mass. 



2' Rhynchonella beds. 



4' covered. 



1' soft, uneven gray shales with few fossils. 



5' covered — bed full of B. granulata on surface of slabs. 



4' soft, greenish shales with limestone bands. 



8' covered. 



1' bed covered with very small Chaetetes and Tentaculites. 



3' hard, dark limestone full of small Chaetetes and some Brach- 

 iopods. 



6' covered. 



1' Limestone beds. 



1' Soft Shale. 



8' covered containing Leptaena bed, L. rugosa. 



3' Rough Shales. 



4' covered. 



\' thin, smooth, even-bedded shale. 



8' covered. 



6' Coral bed containing iStromatopora and Favosites. 

 15' rubbly limestone— no fossils noted. 



2' smooth, even-bedded limestone shale— no fossils seen. 



3' covered. 



1' shaly, soft bed — full of a Syringopora ? and Sphierocystites 

 multifasciatus. 



5' Rhynchonella bed— crammed with R. formosa. 



\ full of very small crinoidal relics with a few Brachiopods. 



3' close, firm, blue limestone with Rhynchonella formosa. 



3' thin-bedded, wavy limestone, several thin beds crammed with 



Murchisonia minuta. Murchisonia beds. 

 12' shaly limestone weathering into rounded lenticular nodules, 

 with a few Beyrichiae and Rhynchonella and toward the 

 top a few Murchisonia. 



4' coarse limestone full of Beyrichia notata, Hall. 



8' thin-bedded yellow limestone. 



6' blue thin-bedded limestone. 



1' thin-bedded limestone— Leperditia alta abundant. 

 40' ground covered. 



50' thin-bedded limestone, dark, containing no fossils but the little 

 Entromostraoan, Leperditia alta. 

 Waterlime. Beds thinner toward the top. 



