Hook Mountain Basalt-
Lower Jurassic
2 major flows
maximum thickness 110 m
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Preakness Basalt-
Lower Jurassic-
3-4 major flowsof basalt, types vary from columnar through amygdaloidal and pillow formation
maximum thickness to 320 m
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Orange Mountain Basalt-
Lower Jurassic-
3 major flows of basalt of various forms
maximum thickness 182 m
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Diabase Intrusives-
dikes of intrusive diabase which make up the Palisades and other sills and dikes of the region
minerals usually restricted to vein fillings
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Traprock Formations of the Region