erratic

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erratic

a piece of rock that differs in composition, shape, etc., from the rock surrounding it, having been transported from its place of origin, esp by glacial action

erratic

[ə′rad·ik]
(geology)
A rock fragment that has been transported a great distance, generally by glacier ice or floating ice, and differs from the bedrock on which it rests.
References in periodicals archive ?
Erratic boulders of massively silicified limestone containing remains of dasyclad algae and bryozoans are known from Gotland.
The AONB also includes Castle Ring, an Iron Age hill fort, which is the highest point on the Chase, and several glacial erratic boulders that are the remnants of glaciation, including one that's mounted on a plinth.
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.