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The Castle Rock Conglomerate is a late Eocene fluvial deposit flanking the east side of the Colorado Front Range and lying within the Colorado Piedmont. It occurs as a northwest-southeast–trending swath ~63 km in length and between 3 and 10 km in width, and is ~70 m in thickness. The conglomerate consists of a matrix of arkosic coarse sand and granules along with pebble- to boulder-sized clasts that vary in abundance. Locally, the upper portion of the conglomerate is well exposed in cliffs and ledges and also in flat outcrops along drainages. Large to very large-scale cross- bedding, of...

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