233 
This erosion of the Beacon Hill formation pictured above was 
brought to an end finally by the gradual subsidence of the whole 
region. 
Little by little the lower part of New Jersey sank so 
or: 
o res 
ir. Н 
"Ma 
IG. 2. Map of southern New Jersey at the time of the Pensauken Sub- 
mergence. All the dotted area was under water, including the Cape May region. 
The undotted area has not been submerged since upper Miocene times. (From 
Salisbury. Geol. Survey N. J. 4: pl. IO.) 
that everything but the then upland Beacon Hill formation was 
submerged (Pensauken Submergence).? 
The accompanying map (fig. 2) shows the extent of the sub- 
* Salisbury, R. D. loc. cit. 129. 
