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| 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 |
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