Annual report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution . Pig. 12—Fragment of rhyolite from the Potomac, 10 miles below Washington. G. H. Williams, of Johns Hopkins university, an assistant geologiston the Survey (whose untimely death in 189-4 was a serious loss toscience), reported its occurrence in South mountain, and in the autumnhe and Mr Arthur Keith, of the Geological Survey, furnished me with amap of the formations so far as outlined at that time. The outcropsextended in broken narrow belts through Maryland and Pennsylvania,as already mentioned. Early in
Annual report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution . Pig. 12—Fragment of rhyolite from the Potomac, 10 miles below Washington. G. H. Williams, of Johns Hopkins university, an assistant geologiston the Survey (whose untimely death in 189-4 was a serious loss toscience), reported its occurrence in South mountain, and in the autumnhe and Mr Arthur Keith, of the Geological Survey, furnished me with amap of the formations so far as outlined at that time. The outcropsextended in broken narrow belts through Maryland and Pennsylvania,as already mentioned. Early in November, 1892,1 set out in search of the quarries. Takinga team at Keedysville, Maryland, I crossed the mountain ridge at sev-eral points, tindiug excellent outcrops of the rock at many points, butno trace of aboriginal operations appeared until I reached Maria BUREAU OF ETHNOLOGY FIFTEENTH ANNUAL REPORT PL. XLIX. SHARPENED BOWLDERS FROM POTOMAC VILLAGE-SITES lACTUAL SIZE) HOLMES) SOUTH MOUNTAIN RHYOIJTE QUARRIES 75 Furuace, Peunsylvania, on a branch of the ^Monocacy, 10 miles south-west of Gettysbm-g. Here the mountains rise abruptly and to greatheights from the Darrow stream bed, and the rhyolite forms a largepart of the rouky mass. A cluster of flakes was observed on the road-side some 2 luiles above the railway crossing, and extensive aboriginalquarries were soou found on the monutain side half a mile irp the north-ern slope. During the first visit only a preliminary examination was ancient workings observed cover several acres of the wooded moun-tain side. The pitting is not pronounced, although traces of disturb-ance are readily recognized and the entire soil is filled with brokenmasses of the roc-k and the refuse of blade making. Xear the lowermargin of the (juarries a small jiatch had recently been cleared andplanted in peach trees. Here countless numbers of the partiallyshaped
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