Figures
George W. Bain
1.
The Connecticut River undercuts the Hadley bank
2
2.
Natural levees south of the Sunderland Bridge
2
3.
Block diagram showing main features of central Massachusetts at the present time
5
4.
Block diagram showing main features of central Massachusetts during recession of the Ice Sheet
5
5.
Block diagram showing main features of central Massachusetts during excavation of the lowland
13
6.
Block diagram showing main features of central Massachusetts after Triassic basins were filled
13
7.
Map of Mount Toby showing gorges filled with conglomerate
20
8.
Map showing agglomerate burying a fault scarp on Notch power line
24
9.
Block diagram showing main features of central Massachusetts during volcanic stage
27
10.
Block diagram showing the Triassic basins of central Massachusetts
27
11.
Map of old volcanic region near Mount Hitchcock and west of the Notch
29
12.
Block diagram showing topography during formation of the lead veins
31
13.
Block diagram of region during Middle Ordovician time
39
14.
Block diagram of region at end of Ordovician time
39
15.
Block diagram of region during Devonian period
39
16.
Block diagram of region during Carboniferous period
41
17.
Block diagram of region in early Triassic time
41
18.
Block diagram of region in late Triassic time
41
19.
Block diagram of region at opening of Cenozoic era
45
20.
Block diagram of region at the present time
45
21.
Map showing location of interesting places
53
22.
Meander scarps at edge of flood plain, Sunderland
57
23.
Map of the Leverett lead veins
65
24.
Diagrams showing development of Notch and Notch Mountain
74
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