Claystone is a lithified, non-fissile mudrock that is composed of up to fifty percent clay (sediments that are less than 1/256 of a millimeter in size). These tiny sediments form in soil, volcanic ash, and during glaciation processes. Claystones tend to be structurally unstable and land movement is common in regions composed of claystone. Most of the bedrock in southwestern Colorado is made up of claystone.

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