xii CONTENTS 



PAGE 



The interlobate morainal area . . . . . . .271 



Eastham plain ......... 271 



North Truro plain ........ 275 



Wellfleet plain ......... 276 



Plymouth interlobate moraine ....... 277 



Postglacial or Recent changes . . . . . . . . . 279 



Changes in the shore line 279 



Webb's Island . . . 283 



The Provincelands hook . . . . . . . - • 284 



Barnstable Beach 288 



The south shore of the Cape ........ 288 



Land- tied islands ......... 288 



Work of the wind on Cape Cod ........ 289 



Deflation of the glacial gravels 291 



Erosion of cliffs by winds 293 



Dunes formed from beaches 294 



Dunes of the Provincelands . . . . . . . . 295 



Dunes of Barnstable . . • 298 



Dunes of Monomoy . 298 



Swamps and marshes • • • • ■ 299 



Freshwater swamps 299 



Chamaecyparis bog near Wood's Hole . . . . 300 



Submerged tree stumps 301 



Marine marshes • • • 302 



Peat deposits ........... 303 



Postglacial changes of level ......... 304 



Chapter II.— Geology of the Elizabeth or Gosnold Islands 306 



Introduction - 306 



Naushon Island 308 



Salient features . • 308 



Cretaceous deposits . . . • ... . . • 309 



Miocene greensand - 310 



Pleistocene sections . . . • • - • • .310 



Later Wisconsin or Falmouth moraine 311 



Frontal moraine . . . . . . . • .311 



Kettle holes . . . . . . . • - .312 



Glacial erratics 313 



Agate pebbles 315 



Pasque Island 315 



Nashawena Island .. ........316 



Cutty hunk Island . . . . . ■ • ■ • • .318 



Geologic Structure .......... 319 



Sow and Pigs Reef ........... 320 



Penikese and Woepecket Isles . . ..... 321 



Penikese Island 321 



Gull Island • .321 



Woepecket Isles ........... 322 



Woepecket Rock ........... 322 



Ribbon Reef 322 



