Flint Ridge, Licking County, Ohio.
The jasper quarries on the Susquehanna and Delaware.
Those of Indian Territory, Missouri, and Illinois.
Near Coshocton, Ohio.
Near Allentown, Pennsylvania.
The obsidian cliffs of Yellowstone Park.
Piney Branch, in the District of Columbia.
Southwestern New Mexico.
Little River, Tennessee. (See Fig. 1.)
Wyoming and California quarries.