39 



overgrown with delicate Bryozoa and Anloporn corals, 

 which fnrnish an additional incentive for collecting them. 



A large number ot concretions occur in this lower shale, 

 among which the horn-shaped forms with smooth slicken- 

 sided exterior are characteristic. These are often mistaken 

 for organic remains, chiefly cup corals, and are prized as such 

 by the inexperienced collector. An axis or core of iron 

 pyrites will usually be found as the nucleus of these concre- 

 cretions. Frequently the strata above and belo\v, as well as 

 on the sides, appear crowded out of position, as il by the 

 growth of the concretion. As before noted, however, this 

 crowded appearance is probably due to the settling down of 

 the strata around the resistant body. 



A fe\v feet below the layer bearing the Athvris spirifcroidcs 

 (Eaton), pelec^'pods occur plentifulh'. A large num- 

 ber of species have been obtained, manv of which have not 

 been noticed elsewhere in this region. At the base of the 

 clift, near the mouth of the "corry " Liorbvnchus multicostus 

 Hall again occurs in abundance in some concretion bearing 

 beds. Another concretionary layer containing .4. spirifer- 

 oides ( Eaton ) occurs twenty feet below the Encrinal lime- 

 stone. Throughout the exposed portion of the shales, 

 lossils occur in considerable nmnber and variety. Brachio- 

 pods always predominate, the most abundant being 

 Spirifer mucronatiis (Conrjid). Good specimens of the 

 trilobite Phacops rana ( Green ) are occasionally found ; but 

 on the \vhole, only the smaller sjiecies of organisms are 

 abundant. Thus, Chonctes lepicla Hall, and Anihocoelia 

 umhonata (Conrad), as well as the little Pholidops hamil- 

 tonice Hall, are abundantly scattered through the shales. 

 Liorhynchus multicostus Hall is common in the lower ten 

 or fifteen feet. 



About twentA'-five feet below the Encrinal limestone occurs 

 a thin argillo-calcareous bed, less than t\vo inches thick. 

 This contains large numbers of Modiomorpha suhalata 

 (Conrad), a characteristic Hamilton pelecypod, and one 



