54 BULLETIN: MUSEUM OF COMPARATIVE ZOÖLOGY. 
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 fow 
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: — 
Feet 
SEA LEVEL Ir 
FicGurk 17. Section of Richmond Beds at Galinas Point. Section of Bluff 
West Side of Harbor at Port Maria, 
Feet. 
Cona I ow v M o NUS PX cuui Da 
a p 
(109. LO 
e ee qM v xa dU 
SH arena URS o V. v VM wot Ts" 8 
o qo 0i (0g VT Se OTI 
Coüglomefats | . d . d 
Congo mamo IO 
Blusa rock, promanly sandstone, 2 2 v 1... S 10 
Jönglomerate IO 
Shaly arenaceous Clay O 
Bonk OCR FO Fn v0 Boy tr Pu cer NIST. 
Bhalo s o 4 59 ee ee $4 01 a) 
