The Great Falls of the Passaic River at Paterson, New Jersey cascade over the Jurassic Orange Mountain Basalt, the lowest of the basalt flows that make up the Watchung Mountains in the Triassic-Jurassic Newark Basin. The hydropower generated by these falls was important to the industrial development of the newly independent United States in the late 1700s and throughout the 1800s. Today’s deskcrop is from a low roadcut in the park just downstream of the falls. Its diabasic texture is nothing to write home about – it would be a lot more interesting to look at in thin section, but I’ve only got this hand sample for now. (I do think that some thin sections would make for a nice change of pace for the deskcrop series – sounds like a theme for next week!)
Explore this and all of my 2010 Deskcrops and Outcrops in Google Earth!