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141:(a form of asbestos), magnetite, and talc. Serpentinite is derived by the metamorphism of ultramafic rocks (rocks rich in the minerals olivine and pyroxene) in a water-rich environment. The probable original setting for these rocks was within the igneous crust beneath the
106:, which is the highest point along the Atlantic Seaboard south of Maine, at 410 feet (120 m) above sea level. "Todt" is a Dutch word meaning "dead." This hill perhaps received its name from the Dutch settlers because the hilltops overlooking
145:. The occurrence of serpentinite in the core of Staten Island is an indication that the allochthonous basement rocks consisting of oceanic crustal material were thrust landward onto the eastern margin of the continent during the
122:, the second highest point on Staten Island and just a few miles from Todt Hill has similar bedrock characteristics. Serpentine, the dominant mineral in serpentinite, is rich in
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consisted of scattered treeless rocky exposures. The chemical character of the bedrock was, in part, the reason for this. Much of Staten Island is covered by the
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covering the glacier-scoured hilltops is probably responsible for the original barren exposures on Todt Hill.
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The serpentinite has a bluish to greenish gray color, and consists of serpentine (mostly the variety
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are exposed throughout the upland areas on Staten Island.
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43:but its sources remain unclear because it lacks
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161: This article incorporates
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174:United States Geological Survey
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222:Geology of New York (state)
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232:Landforms of Staten Island
169:Staten Island Serpentinite
88:Staten Island Serpentinite
29:This article includes a
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163:public domain material
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112:Harbor Hill moraine
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64:October 2021
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120:Grymes Hill
108:The Narrows
56:introducing
216:Categories
186:40°37′31″N
139:chrysotile
135:antigorite
124:magnesium
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189:74°5′8″W
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