English: A ledge composed of argillite and argillite derived hornfels emerges along the 380ft (115m) contour of— located near Hillsborough Township, New Jersey.
Typical argillite in this region is a grayish color, while hornfels appears blackish and more fine grained due to the effects of contact metamorphism.
Date
26 April 2009 (original upload date)
Source
Self-photographed (Original text: Photo taken by me.)
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2009-04-26 23:38 Lithium6ion 2592×1944× (1924041 bytes) A ledge of volcanic [[trap rock]] emerges along the 380ft (115m) contour of [[Sourland Mountain]] near [[Hillsborough Township, New Jersey]]. Photo taken by me.
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