BULL. GEOL. SOC. AM. 



VOL. 27, 1915. PL. 9 



f \4 



Figure 1. — The Surface of the Anderdox Limestone, showing Molds a.\d Joints filled with 



Onondaga Mud 



V 





*' ?. >> 



, «. 



Figure 2. — Utper Surface of the Anderdon Li.mi:stoxe, showing Onondaga Casts in the 



Anderdon Molds 



FOSSILIFEROUS SURFACES OF ANDERDON AT AMHERSTBURG, ONTARIO 



