508
POPULAR SCIENCE MONTHLY
The Tiny Rill of a Spring that has already developed a Small Basin.
of the Black Hand formation, which borders the floodplains of all the valleys, a distribution made possible because the formation has an eastern dip of about twenty-five feet per mile. The springs in the Black Hand are numerous and copious, partly because of the thickness
The Black Hand Formation is generally a coarse, irregularly bedded sandstone, yielding a copious supply of spring water.
