‘Fat —. Os ee OT EI A mee CU a s,s EUR A ain DR a ee oe vies 
le Y © 3 * * a E THEN D m 
Rhodora Plate 91. 
13. COPY OF A PORTION OF DE GEER’S MAP OF IHE LAST 
CHANGE OF LEVEL IN EASTERN NORTH AMERICA. BROKEN 
LINES ARE ISOBASES WITH 200 FOOT INTERVAL. DOTTED 
PORTION, THE SUBMERGED COASTAL PLAIN. A. SUBMARINE 
RiIVER-CUANNETe 
