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Mushroom Shaped Concretion, Topeka, Kansas

Picture Gallery of Concretions

By Andrew Alden, About.com Guide

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This concretion appears to owe its mushroom shape from a short period of erosion after it broke in half, exposing its core. Concretions may be quite fragile.

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A shaly shroomPhoto courtesy bueuwe from the Geology Forum; all rights reserved

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