92 The American Geologist. AnKust, looi 
ress, the Coastal Plain ag'ain tilted so as to bring- that portion 
of it lying- to the northeast and against the Piedmont above 
water, while the southeastern ])ortion was still further de- 
I)ressed. The later Columbia was in its turn deposited in the 
estuaries beneath the earlier Columbia where the latter had 
been elevated, and above it where it had been depressed. Con- 
sequently the three formations near the Piedmont were de- 
veloped in separate terraces lying- one above the other, the La- 
fayette at the top, with the earlier Columbia in the middle and 
the later Columbia at the bottom, while in the eastern sub- 
merged portion the formations were not developed in terraces, 
but in a continual series, with an erosive break between the La- 
fayette and the earlier Columbia. In this region the sequence 
ran, beginning at the top, later Columbia, earlier Columbia, and 
Lafayette. 
Mr. Darton has published a number of geologic maps from 
time to time in which these relations are depicted. In an early 
map of the Washington region, he included only two formations 
of gravel, the Lafayette and Columbia, Ijut in a later and re- 
vised edition, which is now in the press, and which he has been 
kind enough to show me, three formations of gravel are por- 
trayed, the earlier and later Columbia and Lafayette, developed 
in distinct terraces, lying one above the other as described. 
The Nomini and Fredericksburg folios of the Geologic Atlas 
of the United States convey his ideas regarding the sequence 
of gravel in portions of southern Maryland and eastern \^ir- 
ginia. In these publications he distinguishes two gravels ly- 
ing in distant terraces, the Lafayette above, covering the di- 
vides, and the Columbia beneath, occupying the valleys. 
VIEWS OF PROFESSOR R. IX SALISBURY. 
Professor R. D. Salisbury commenced his work on the de- 
tailed survey of the Pliestocene deposits of the Coastal Plain of 
New Jersey in the summer of 1891. In his first report* he 
mentions a number of peculiar deposits bearing glaciated liould- 
ers which he states were somewhat like till in character. The 
following is quoted from the Report of the State Geologist of 
l\ew Jersey for 1891, page 107: 
"Drift, closely resembling till and containing striated rock 
material, occurs on the west side of the Delaware, near Falls- 
*Annual Report of the State Geologist of New Jersey for 1891. 
