Cresson.] 
152 
[Dec. 19, 
And so I found it in fact. There is no evidence of much glacial 
drainage through those counties. But the glacial drainage was 
east of the knobs towards Louisville, Kentucky. This the Indi- 
ana geologists early perceived and called the glacial stream Col- 
let’s River. Medora lies a few miles west of where I located the 
boundary of direct glaciation, but in a valley where water depos- 
its from the ice front would have been likely to have accumulated 
to a considerable extent. It is quite possible that the deposit 
marked D is a direct glacial deposit. If not it is what accumula- 
ted in the temporary lake which existed there for a while when the 
mouth of the river was dammed up by the Illinois loess. The tri- 
angular glaciated space in southern Indiana must have been a fa- 
vorable place for preglacial man, and its borders present just the 
conditions for the preservation of his remains.” 
THE AGE OF THE PHILADELPHIA RED GRAVEL. 
BY G. F. WRIGHT. 
The discovery of palaeolithic implements, as described by Mr. 
Cresson near Claymont, Del., unfolds a new chapter in the history of 
man in America. It was my privilege in November last to visit the 
spot with him, and to spend a day examining the various features of 
the locality, and the views presented on the screen have brought the 
situation vividly before your eyes. 
Notwithstanding the danger of a little repetition, I will state 
that the cut in the Baltimore and Ohio railroad in which this im- 
plement was found is about one mile and a half west of the Delaware 
river, and about one hundred and fifty feet above it. The river 
is here quite broad. Indeed, it has ceased to be a river, and is 
already merging into Delaware bay ; the New Jersey shore being 
about three miles distant from the Delaware side. The ascent 
from the bay at Claymont to the locality under consideration is by 
three or four well-marked benches. These probably are not terraces 
in the strict sense of the word, but shelves marking different periods 
of erosion when the land stood at these several levels, but now 
thinly covered with old river deposits. Upon reaching the locality 
of Mr. Cresson’s recent discovery, we find a well-marked superficial 
water deposit containing pebbles and small boulders up to two or 
three feet in diameter, and resting unconformablj T upon other de- 
posits different in character ; and in some places directly upon the 
