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A branching root cast from grasses that grew on the ashy lahars deposited along the ancestral Missouri River system

By Yellowstone Volcano Observatory November 2021 (approx.)
A branching root cast from grasses that grew on the ashy lahars deposited along the ancestral Missouri River system
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Detailed Description

A branching root cast from grasses that grew on the ashy lahars deposited along the ancestral Missouri River system. Plant roots growing in calcareous soils made holes that were filled with calcite after the organics rotted away.  Photo by Rob Thomas, August 2021.

Sources/Usage

Public Domain.