The Glacial erratic cache is located at the The Essex County Environmental Center is located in the western section of Essex County at West Essex Park. West Essex Park is 1,360 acres of wetlands preserve which remains almost entirely undeveloped. It stretches along six miles of the Passaic River, starting at Bloomfield Avenue in Fairfield, and ending just beyond South Orange Avenue in Livingston.
A glacial erratic is a piece of rock that differs from the size and type of rock native to the area in which it rests. "Erratics" take their name from the Latin word errare (to wander), and are carried by glacial ice, often over distances of hundreds of kilometres.
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