Essex County, South Mountain Reservation, West Orange/Maplewood/Millburn, New Jersey, USA.
Basalt lava flows in this rift valley (Newark Basin, Piedmont). Look for turtle backs, which were formed when the basaltic traprock fractured into small hexagonal blocks. Minerals filled in the cracks, then erosion wore away the basalt faster than the minerals. The resulting pattern was rock similar to the back of a turtle.
West Branch of the Rahway River heads south through the park flowing through Orange Reservoir, Campbells Pond and Diamond Mill Pond.
Thursday, October 30, 2008
South Mountain Reservation
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