ILLUSTRATIONS 



[Note. — In cases of inconsistently in the sizes of the illustrated objects as given in the descriptive 

 titles thereof and in the following list the sizes given in the lattershould govern.] 



Page 



Frontispiece. Group in plaster illuatratiu;; iiuarry-shop work 13 



Plate I. Map of tbt Potomae-Che.sapeake tidewater province 14 



II. Map of the Piny braut'h ciuarries 17 



III. Quarry-.shop refuse exposeil iu tlie liauk of the rivulet 18 



IV. View looking north up the rivulet at the foot of the quarry slope. .. 19 

 V. View from the bed of the rivulet, showing exploitation pits 20 



VI. Section of quarry e.x j)08ed by the first trench 21 



VII. Section of ancient pit filled with quarry-shop refuse from above... . 22 



VIII. Character of (juarry-shop refuse at the fortyfourth foot 24 



IX. Face of the trench at the seventyseventh foot 2(5 



X. Character of refuse deposits at the seventyseventh foot 27 



XI. Pocket of refuse deposits at the seventyseventh foot 28 



XII. Portion of an extensivedejiosit of shop refuse near the (juarry face. ... 30 



XIII. Section showing the irregular quarry face 31 



XIV. Roots of a chestnut tree growing in a bed of shop refuse 33 



XV. Section showing deposits tilling the quarry exposed by the third 



trench 35 



XVI. Section showing the quarry face exposed by the fifth trench 37 



XVII. Quarry-shop rejects — progressive series 38 



XVIII. Blade-like rejects from the quarry-shop refuse 40 



XIX. Rejected blades of most advanced form found iu the quarry-shop 



refuse 40 



XX. Rejected blades of most advanced form found in the (luarry-shop 



refuse 40 



XXI. Broken blades representing the most highly elaborated forms made 



in the quarry-shops 43 



XXII. Fragments of blades representing the most highly elaborated forms 



made iu the quarry-shops (f actual size) 44 



XXIII. Relation of the flaked blade to the parent bowlder (f actual size) ... 44 



XXIV. Two specimens of flaked stone found in a single cluster (factual size). 45 

 XXV. Core-like forms from which flakes have been taken (| actual size). .. 47 



XXVI. Site of the Dumbarton quarry, showing refuse-covered slopes 49 



XXVII. Potomac bowlder bed exposed in grading V street 51 



XXVIII. Series of rejects from the South mountain rhyolite (juarry .52 



XXIX. Rhyolite cache blades from a garden ou Frogmore creek, near Balti- 

 more (+ actual size) 55 



XXX. Rhyolite blades from various caches (J actual size) 55 



XXXI. Quartzite cache blades from Auacostia and Beauings sites (J actual 



size) 55 



XXXII. Relation of specialized leaf-blade implements to the original blade.. 56 



XXXIII. Scraping implements of quartz and quartzite (J actual size) 56 



XXXIV. Series of flaked forms illustr.iting progressive steps in the manufac- 

 ture of projectile i)oints from i|uartzite bowlders 59 



9 



