294 



Clara Gould Mark 



The Roberts^ Ravine. In a ravine on the land of Harrison Rob- 

 erts about half way between Wortman's Ravine and the village 

 of Fultonham the Mercer limestone and the Homewood sandstone 

 are exposed. The interval between them was not measured, but 

 it is not more than eight or ten feet and consists entirely of the 

 dark gray calcareous shale that is seen above the Mercer limestone 

 in the other ravines studied. 



From the Mercer limestone in this ravine the following species 

 were collected: 



Productus semireticulatus (Martin) 

 Productus longispinus Sowerby 

 Spirifer camaratus Morton 

 Reticularia perplexa (McChesney) 

 Seminula argentea (Shepard) 



Crinoid segments 



