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It is now used as a standard procedure of determining exposure ages of erratic boulders and the respective moraines (e.
Erratic boulders of massively silicified limestone containing remains of dasyclad algae and bryozoans are known from Gotland.
The 92-mile Midstate winds through 14 towns and features a bit of everything: small mountains, glacial erratic boulders, federal flood control dams, two Audubon Society nature reserves, dozens of ponds and streams, historical sites and abundant plant and animal life.
She is well aware of the variety of small rocks under her feet and of the larger erratic boulders poking up from the blanket of leaves.