The igneous rocks at Greenbrook are part of the Palisades Sill – Wikipedia. The rocks are mostly diabase. Research on the origins of the intrusion(s) is ongoing.
Rocks at Greenbrook
The igneous rocks at Greenbrook are part of the Palisades Sill – Wikipedia. The rocks are mostly diabase. Research on the origins of the intrusion(s) is ongoing.
A lovely mix of textures
Thanks Derrick
The geology is complex and fascinating. There are several boulders in NYC deposited from the last ice age, also terminal morraines. Igneous rock must be from an irruption I guess.
This article explains the geology well.: https://en.wikipedia.org/wiki/Palisades_Sill Happy Holidays.