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They also found other things of interest to capture at Sibley Farm, including Christmas ferns and a glacial erratic boulder.
But in another calibration study, using erratic boulder surfaces from a radiocarbon dated moraine, Clark et al.
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.