PLATE XI. (a).— View of Section 6, showing four feet of Hamilton shales at 

 the 1ki.sc; the Encrinal limestone, the Moscow shales, the Styliolina band, the 

 Genesee shales and a portion of the Cashaqua shales. 



i/m. View of the Bncrinal limestone of Section 6, showing the undermining of 

 the bed, and the recently fallen blocks. — Photographed by A. \Y. Grabau. 



