LLUSTRATIONS. 



Plate I. Hummock of granitic till ; Casoo 34 



11. Preliminary map of marine clays of Maine 58 



III. y4. Lakelet surrounded by glacial gravel ; Lee 104 



B, Dome of coarse gravel ; Springfield 104 



IV. A, Osar crossing Penobscot River 106 



B, Osar expanded to a plain ; Soutli Lincoln 106 



V. A, Osar forking into a double ridge 108 



B, Katahdin osar ; Eufield 108 



VI. A, High gravel massive 112 



B, Till bowlders in glacial gravel 112 



VII. A, Osar penetrating a low pass ; Clifton 120 



B, Broad osar terrace ; Bncksport 120 



VIII. Osar ending at the shore of Penobscot Bay ; Stockton 130 



IX. Meandering of osar ; Detroit 146 



X. Hogback Mountain, looking west across south end of pass 152 



XI. Diverging delta branches of osar ; Hogback Mountain Pass 154 



XII. Lenticular gravel hillock ; China 168 



XIII. Succession of three lenticular eskers, part of a discontinuous osar; Windsor 170 



XIV. A, Funnel in gravel massive; West Bowdoin 186 



B, Ravines in gravel parallel with the direction of the glacial river; Durham 186 



XV. A, South end of a hillside esker ; Jay 214 



B, Hillside esker; Hebron 214 



XVI. Broad osar penetrating a low pass ; Woodstock 220 



XVII. Osar eroded by Sebago Lake 242 



XVIII. Broad osar passing over high hill; Baldwin 244 



XIX. Till bowlders in osar ; Baldwin 246 



XX. Broad osar crossing col ; Brownfield 254 



XXI. The Notch; Hiram 258 



XXII. Osars on hillsides; Newfield 260 



XXIII. A, Plexus of kame ridges and mounds near North Acton 262 



B, Terminal moraine; Winslows Mills, Waldoboro - 262' 



XXIV. A, Section of terminal moraine - - 272 



B, Top of terminal moraine 272 



XXV. A, Terminal moraine ; Waldoboro 274 



B, Terminal moraine of Androscoggin glacier ; Gilead 274 



XXVI. A, Bare ledges in channel of glacial river ; Parsousfleld 332 



, ZJ, Osar sprinkled with till bowlders; Prospect 332 



XXVII. A, Reticulated ridges of coarse water-rolled gravel ; Parsonsfield 336 



i?, Stratification of glacial marine delta; Monroe 336 



XXVIII. Discontinuous osar near Monroe Village 376 



XXIX. Till bowlder on glacial gravel ; West Bowdoin 378 



XXX. Till bowlders on marine delta gravel ; Watevboro 3^2 



XXXI. Map of Maine, showing approximately the lines of frontal retreat of the ice 392 



XXXII. Osar, Whalesback ; Aurora - - - - 414 



XXXIII. Wall on broad osar ; Woodstock - 442 



XXXIV. Reticulated kames; Porter 448 



XXXV. Large osar bowlders on hillside ridge ; Porter 450 



XXXVI. A, Kettlehole in marine delta, near Monroe Village 452 



B, Lake bordered on all sides by terraces of glacial gravel ; Hiram 452 



