Annual report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution . rtion of the exposure is shownin plate xxvii. the bowlders is the crumbling surfixce of themicaceous gneiss. Considerable flaking was done on the surface at thispoint, and clusters of flakes and failures occur on the slope back of theseated figure. Beyond is the valley of Hock creek and the heights onthe west. In the Zoological park, a little fartlier up the valley andconnecting around the faces of the Mount Pleasant blufts to the Pinybranch site, are numerous spots on which considerable work wa
Annual report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution . rtion of the exposure is shownin plate xxvii. the bowlders is the crumbling surfixce of themicaceous gneiss. Considerable flaking was done on the surface at thispoint, and clusters of flakes and failures occur on the slope back of theseated figure. Beyond is the valley of Hock creek and the heights onthe west. In the Zoological park, a little fartlier up the valley andconnecting around the faces of the Mount Pleasant blufts to the Pinybranch site, are numerous spots on which considerable work was done. It may be added that on the level upper surfaces of the plateauoccupied by ;\Iount Pleasant and by neighboring suburbs there aretraces of aboriginal occupation, consisting chiefly of finished, oftenbroken flaked imiDlements of ordinary varieties, and rarely of j)eckedand polished tools. SHOP SITES OF THE MIDDLE POTOMAC VALLEYFALLS SECTION OF THE POTOMAC A study of the manufacture -of stone implements in the Potomacregion would jnoperly include an examination of the thousands of.
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