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At 970 feet (295 m), Haycock Mountain dominates the northern Bucks County landscape. It is located along the northern shore of Lake Nockamixon and is designated as Pennsylvania State Game Land and is therefore public property. Near its base is a trail called Top Rock Trail that leads to its summit. It’s a relatively easy hike, but the top section requires some scrambling over large boulders.

These boulders are part of a vein of rock called diabase that stretches from central New Jersey to through Pennsylvania as far as the Devils Den in Gettysburg. These boulders are part of a vein of rock called diabase that stretches from central New Jersey to through Pennsylvania as far as the Devils Den in Gettysburg.

Diabase forms from a magma that is rich in iron and magnesium, and poor in silica (quartz). The origin of the diabase found in Pennsylvania is related to the movement of large, continent-sized plates. The diabase is found in a place that was being rifted, or pulled apart, when North America and Africa were separating, forming the Atlantic Ocean. Magma from the mantle entered the space that separated the two sides, forming igneous rock that, with sediments, filled the widening gap.

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Additional Photos by Linda Richters (richtersl) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 992 W: 583 N: 849] (3546)
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