Shelters, Shacks and Shanties
To-day any one may use a pointed stick on the floor of one of these half caves and unearth, as I have done, numerous potsherds, mussel shells, bone awls, flint arrow-heads, split bones of large game animals, and the burnt wood of centuries of camp-fires which tell the tale of the first lean-to shelter used by camping man in America.
The projecting ledges of bluestone that have horizontal seams form half caves from the falling apart of the lower layers of the cliff caused by rain and ice and often aided by the fine roots of the black birch, rock oak, and other plants, until nature has worked long enough as a quarry-man and produced half caves large enough to shelter a stooping man (Figs. 8, 9, and 10).
Although not always necessary, it is sometimes best to make a shelter for the open face of such a cave, even if