Tuesday, June 17, 2014
Magnetic Rocks in Herrontown Wood
Along with the many roles the rocks have played in the past two hundred years, there is the story of how the rocks got there in the first place. It's told by the great majority of rocks and boulders never piled in rows or split apart. One important point to grasp from the get go is that the glaciers did not form the Princeton Ridge. The glaciers' southernmost extent coincides with where Manhattan is today, some distance to the north. What forces, then, created this long ridge of boulders?
A couple weeks ago, I joined my neighbor Jon Johnson on one of his morning walks with his dog Cocoa in Herrontown Woods. His expertise is in groundwater, but he's been studying the rocks he finds in the streams and along the trails, and sharing some of what he's discovered with students at Little Brook Elementary, where his kids go to school.
Head upstream and you'll see the rocks getting rounder