﻿15 Range of Trenton Species 7 



B. 21-30 of field notes. Upper part of A x , P. & C. 



This zone extends from the hard layer below the path at 

 Sherman Falls to the first prominent seam in the face of the fall. 

 Irregular beds of quite pure fine grained limestone in layers two 

 to eight inches thick, separated by shaly partings. Contains a 

 few layers of coarser grained, semi-crystalline limestone. The 

 upper 2 ft. 8 in. forms a band which is made noticeable by the 

 nodular appearance of its weathered surface. It contains many 

 fucoidal remains. 9 ft. 9 in. = 25 ft. 7 in. 



Lingula rectilateralis, rr, Murchisonia gracilis, rr, 



Trematis termi?ialis, rr, Asaphiis platycephalus, c, 



Damanella testudinaria, r, Calymene senaria, c, 



Plectambonites sericeus, r, Leperditia sp. , r, 



Rafinesquiiia alternata, r, Stictopora elegantula, rr, 



Zygospira recurvirostris, rr, Monticulipora ly coper don* c, 

 Ctenodonta levata, rr, - Orthoceras sp., r, 



Bellerophon bilobatus, r, Crinoid columns, c. 



C. 31 of notes. A 2 , P. & C. 



Three to five inch layers of more impure limestone separated 

 by shaly partings. Interbedded with these are a few thin, 

 coarsely crystalline layers which are, especially toward the top, 

 full of Dalmaneila tcstudinaria. Some of the other layers are 

 made almost entirely of crinoid stems. This zone forms the 

 conspicuous layer in the upper part of Sherman Falls. 10 ft. 

 8 in. = 36 ft. 3 in. 



Trematis terminalis , rr, Calymene senaria, r, 



Dalmaneila teshidinaria , c, Ceraurus fileurexanthenms, rr. 



Zygospira recurvirostris, rr, Leperditia sp., r, 



Bellerophon bilobatns, rr, Orthoceras sp., rr, 



Monticulipora lycoperdon, c, Crinoid stems, a. 

 A saph u s pla tyceph a Ins, c . 



D. 32-42 of notes. A 3 + 2 ft. 5 in. of A 4 , P. & C. 



Impure shaly limestone at the base, grading into purer blue 

 black layers with shaly partings. Best exposed for collecting on 

 the east side of the stream above Sherman Falls. Most fossilifer- 



* This name is used throughout this paper in the same meaning as in 

 Vol. I, Pal. of N. V. 



