GU STONE IMPLEMENTS [eth.ann.ij 



'I'Ik! iiatuic of tlic (|ii;iriyiiif;, llie ])i'ocesses of iiii|iIcMieiit .sliajjiug, 

 and the nuarry product correspond closely with those of the Piny 

 bi-aiich site, and a description woiihl hut repeat what has been already 

 said ill the previons section. 



()ini:i; i.-ncK fiMci.K sites 



Xorth ol the Dumbarton hL'ij;hts ([uarries the bowlder beds occur 

 near or on the summits of the hills, and traces of ancient manufacture 

 are occasionally seen. On a high point less than a ipuirter of a mile 

 west of the crossing of Connecticut avenue and i'iercc mill road, much 

 shop refuse is found. This is within a few hundred yards of the Rose 

 hill soajistone (piarry, and repre.'^ents the extreme limit of the Poto- 

 mac bowlder deposits in this direction. 



The new Naval Observatory on the ridge soutii of tiie (piarry Just 

 described is built on an ancient ([uany site. (Quarrying, ajipaiently on 

 a limited scale, was carried on in the banks of the ra\ine now occupied 

 by the power bouse, as the excavations for foundations and drainage 

 exposed quantities of the chipped bowlders. 



The blulfs of Kock creek within the suburbs of the city are lined witli 

 sites on which the ancient bowlder worker established Iiis shops. The 

 work was everywhei-e the same, save that as a rule quarrying was not 

 carried on to such an extent as to leave traces of the pitting. Ou both 

 sides of the creek at the crossing of Massachusetts avenue the refuse 

 of bowlder Uaking is strewn over the slopes from base to summit of the 

 bluH's. The cuttiug of U street at a point overlooking the Massachu- 

 setts avenue bridge on the east has exposed an excellent section of the 

 base of the Potomac bowlder beds. A jiortion of the exposure is shown 

 in plate xxvir. Beneath the bowlders is the crumbling surface of the 

 micaceous gneiss. Considerable flaking was done on the surface at this 

 point, and clusters of Hakes and failures occur on the slope back of thi; 

 seated figure. Beyond is the valley of Kock creek and the heights on 

 the west. In the Zoological park, a little farther up the valley and 

 connecting around the faces of the ]\Iount Pleasant bluffs to the Piny 

 branch site, are numerous spots on which considerable work was done. 



It may be added that on the level upper surfaces of the plateau 

 occupied by Mount Pleasant and by neighboring suburbs there are 

 traces of aboriginal occupation, consisting chiefly of finished, often 

 broken llaked implements of ordinary varieties, and rarely of ])ecked 

 and polished tools. 



SHOP SITES OF THE MIDDLE POTOMAC VALLEY 

 FALLS SECTION OF THE I'DTOMAC 



A study of the manufacture of stone implements in the Potomac 

 region would i)roi)erly include an examination of the thousands of 



I 



