36 F. D. Chester—Gravels of Southern Delaware. 
Art. X.—The Gravels of the Southern Delaware Peninsula; by 
FREDERICK D. CHESTER. 
In a former number of this Journal (March, 1884), under the 
title of “The Quaternary Gravels of Northern Delaware and kast- 
ern Maryland,” the writer described those deposits known as the 
Red Sand and the Philadelphia Brick Clay, which cover to 
great depths the underlying formations of New Castle and 
Cecil Counties. Later investigations in connection with a geo- 
logical survey of Delaware lead us to consider the surface 
deposits of the peninsula as a whole; and, although this paper 
is intended as a continuation of the other, it will be necessary, 
first, to review very briefly some of the facts previously 
brought out, before describing in detail the phenomena of the 
southern area. The surface formations of the peninsula may 
be classed as follows: 
1. High Level or Bryn Mawr Gravel -.---- Cretaceous ? 
Red Sand. 
2. Delaware Gravels ---- Quaternary. 
Philadelphia Brick Clay. 
R Bovaary Baids < So ccssi oer oes Quaternary. 
4, Bop CMAN co co os Modern. 
A Review oF THE NorTHERN AREA. 
High Level Gravels.—In traveling over the highlands of ; 
Northern Delaware, just back of the old terrace line of the — 
continuous patch. e same formation, as shown by other — 
geologists, extends over the heights of Southeastern Pennsyl- — 
vania, Southern New Jersey, and the District of Columbia, 
indicating a considerable ingress of the sea shore line. As far 
as Delaware is concerned, we can say, that during the Bryn 
