913 



Kusi. 



be considered of later age than Triassio, (Hitchcock, Ichn. 

 N. E. 1858, page 6, plate 5, fig. 1, and plate 7, fig. 1 (the last of 

 which I insert here.) A twig and contf from Field's qnarry 

 Mass., in the Amherst museum, closely resembles Lyell's fig. 

 244, in his Manual of Geology, 4th edition, of one from the 

 European Wealden formation at the bottom of the Cretaceous. 

 (See Hitchcock's plate 7, fig. 2, here given). 



Mass. 



I. 



'^^'^y^'^¥^^ 



MM 







M^t^^B^KliifiP''^^^ 





Til^OLSl 







■ .^'' '^ 







Rusichnites carbonarius, Dawson. Acad Geol. 1868, 



page 257, 

 fig. 80 ; ' 

 supposed 

 burrows 

 of trilo- 

 hites or 

 other 

 crusta- 

 ceans of 

 the Coal 

 age. in 

 Nova 

 Scotia. 

 XIIL 



