vi CONTENTS 



Manhasset stage of glacialion 

 Manhasset formation 



Character and subdivisions 

 Herod gravel member 

 Montauk till member 

 Hempstead gravel member 

 Vineyard interglacial stage 

 Wisconsin stage of glaciation 

 Genera] relations 

 Nantucket moraine 

 Falmouth moraine . 

 Interlobate moraines 

 Certain glacial features of the district 



Deformation and dislocation of beds by glacial thrust 

 Tentative correlation of the glacial deposits and interglacial stages 

 Classification of the glacial deposits 

 The larger glacial erratics of the district 

 Postglacial changes .... 

 Swamps and marshes 

 Wind action and dunes . 

 Changes in the shore line 

 Summary of the geological history of the region 

 Mineral resources ...... 



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Paet II. Geology of Particdlak Areas 



Chapter I, Geology of Nantucket and adjacent islands, by J. B. Woodworth . . 93 



Nantucket 93 



Geography . • 93 



Geology .94 



Correlation of formations . . . 94 



Pleistocene epoch 95 



Sankaty sand ........... 95 



Fossil shells under the interior of the island 98 



Coarse gravel .......... 99 



Sections along the north shore ....... 99 



Wisconsin stage of glaciation 101 



The outwash plain .......••■ 101 



The fosse .102 



Nantucket moraine 102 



Hypothetical construction of the corrugated Nantucket moraine 



back of the fosse 104 



Postglacial or Recent epoch . . . : . • • • 105 



Natural changes 105 



Artificial changes . . . . . ... . .110 



Changes made by white men . . . . . . .110 



Indian shell heaps . . . . • • • ■ .110 



Relation of shell heaps or kitchen middens to dunes and sand 



tracts . . . .. . • • ■ .111 



Sand-carved pebbles or glyptoliths . . . . . . .112 



