Quote
"While the geological explorations of the South Mountain have been careful and minute and conducted by able geologists, the petrography of its rocks has never been thoroughly investigated. The microscope has not been used to assist in determining the nature and origin of the rocks, and to correct impressions colored by preconceived ideas or by an experience more or less limited to sedimentary structures. Under microscopic scrutiny and the comparative study of recent lavas, an increasing number of the so-called sedimentary rocks are proving to be igneous in origin."
F
Florence Bascom