54 



BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



ordinary sandstone is rapidly transformed in its seaward extension 

 into a promiscuous assemblage of large pebbles six or eight inches in 

 diameter. This fact indicates that some of this material came from the 

 area to the north, now occupied by the sea. In this same bed of con- 

 glomerate were found the Eocene corals described by Duncan, and a few 

 species of mollusks. An excellent view of this exposure of conglomerate 

 at Port Maria is given on Plate XXIII. The character of its beds as 

 shown in Figure 17 is as follows: — 



Figure 17. Section of Richmond Beds at Galinas Point. Section of BlufE 

 West Side of Harbor at Fort Maria. 



Feet. 



Conglomerate 15 



Shaly sandstone 3 



Sandstone 10 



Conglomerate 10 



Shaly arenaceous clay 3 



Conglomerate 5 



P)luish rock, probably sandstone 10 



Conglomerate 15 



Shaly arenaceous clay 5 



Bluish rock 11 



Shale +}0 



+97 



