Plate 19 



Some common fossils which occur in the Ordovician strata around 

 the borders of the Adirondacks. Creatures like these lived in the sea 

 which spread over much of the Adirondack area during mid-Ordo- 

 vician time, i, Graptolite; 2, Cup coral; 3, Honey-comb coral 

 4, 5, 6, Brachiopods ; 7. Pelecypod ; 8. Gastropod ; 9, Cephalopod 

 (Orthoceras) ; 10. Cephalopod ( Trocholites ) ; 11, 12. trilot)ites (re- 

 stored forms). 



