272 



GENERAL GEOLOGY. 



They are always found extremely compressed, in 

 they were very thin. It has been suggested that 



with fossils, the following 0± ,v,^„ 

 Aviculopecten rectilateraria, very abundant; 

 lorn, ScMzodus, (sp. undet.), Productus murica 

 remains. The bed in Lucas county, referre 



