The Bridgewater plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
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Bridgewater’s center stands about 430 ft above sea level. Within three miles the land runs from 360 ft to 670 ft, a difference of 310 ft: rolling country. The highest named summit within 15 miles is Mars Hill, about 1,730 ft, 7 miles north-northeast.
Under the town center the state geologic map shows Silurian - Ordovician Carys Mills Formation (siltstone, limestone), from the Late Ordovician to Silurian, 434 to 459 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 17×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Siltstone, limestone. Age: Late Ordovician to Silurian, 434 to 459 million years old. About 6 mi of the line.
Graywacke, slate. Age: Ordovician, 445 to 487 million years old. About 3 mi of the line.
Mudstone, sandstone. Age: Ordovician to Silurian, 422 to 487 million years old. About 2 mi of the line.
Greenstone. Age: Ordovician to Devonian, 359 to 487 million years old. About 1 mi of the line.
Mudstone. Age: Late Ordovician to Silurian, 434 to 459 million years old. About 0.7 mi of the line.
Mudstone, sandstone. Age: Silurian, 422 to 445 million years old. About 0.7 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit along the line are not listed.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
