INDEX TO GEOLOGY OF THE VVATKINS AND ELM IRA QUADRANGLES 



Strophalosia truncata, 13 5 . 

 Stropheodonta cayuta, 15 8 , 18 5 , 20 1 , 

 24'. 



demissa, 20 2 . 

 incquistriata, 20 2 . 

 mucronata, 24 s . 



perplana var. nervosa, 20 2 , 24 7 . 

 Styliola fissure] la, 5 3 , 7 s , g s , 13 7 . 

 Styliola limestone, 5 3 . 



Taxocrinus ithacensis, 16 8 . 

 Tornoceras uniangulare, 13 7 . 

 Tropidoleptus carinatus, 18 4 , 19 9 



Undulations, 25 1 -26 7 . 



West Hill flags and shales, i5 4 -i 

 West River shale, 5°-7 2 . 

 Wiscoy shale, 18 9 . 



