VI REPORT OF THE BUREAU OF ETHNOLOGY 



Chapter I — Introductory — Continued. Page 



Character of the stone imp'ii'uieiits 21 



Materials and their distrilnition 21 



Quarrying 23 



Mannfjicture 24 



Initial stages 21 



Sliaping iirocesses 25 



Chapter II — Manufacture of flaked stone implements 29 



Introductory statement 29 



Quarry--workshops of the District of Columbia 30 



History of the research 30 



Geology of the locality 31 



Piny branch quarries 33 



Location of the quarries 33 



Operations on the site 35 



Discovery and reconnoissance 35 



The first trench 36 



The tree pit 44 



Tlie second trench 45 



The third trench 45 



The fourth and fifth trenches 49 



The sixth trench 50 



Other Piuy branch sites 51 



Piny branch shops 52 



(ieneral features 52 



Special features 53 



The quarry-sho)! product 53 



Tools used in flaking 58 



Processes of manufacture 58 



Destiny of the quarry blades 62 



The Dumbarton heights quarry-shops 62 



Location 62 



Geology of the site 63 



Distribution of quarry pits 64 



Trenching 64 



Other Rock creek sites 66 



Shop sites of the middle Potomac valley 66 



Falls section of the Potomac 66 



Anacostia valley 69 



The tidewater Potomac 71 



Sites in James river valley 72 



Quarries of the highland 72 



Materials quarried 72 



Location and product 73 



Rhyolite quarries 73 



Flint ([uarries 77 



Jasper and argillite quarries 78 



Caches 78 



Chapter III — Flaked stone implements 80 



General features 80 



Implements of leaf-blade genesis 82 



Typical characters 82 



Blades — blanks, cutting implements 84 



Specialized blades — jirojectile points, etc 84 



Narrow-shafted blades — jierforators or drills 85 



Specialized blades, etc — scrapers 85 



