674 NEW YORK STATE MUSEUM 



Plate 3 



Thamnocladus clarkei White 



Page 596 



FIG. I 



1 Greater portion of a large frond partly buried in the 

 matrix. The segments are somewhat macerated and 

 show the effect of current dragging. Natural size. 

 Chemung, at East Windsor N. Y. New York state 

 museum. 



