pebble-cobble desert

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Desert pavement — near Barstow, California, in the Mojave Desert. A desert pavement is a desert surface that is covered with closely packed, interlocking angular or rounded rock fragments of pebble and cobble size … Wikipedia
sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… … Universalium
Stone Age — the period in the history of humankind, preceding the Bronze Age and the Iron Age, and marked by the use of stone implements and weapons: subdivided into the Paleolithic, Mesolithic, and Neolithic periods. [1860 65] * * * First known period of… … Universalium
Conglomerate (geology) — For a kind of corporation, see Conglomerate (company). Conglomerate Sedimentary Rock Boulder of conglomerate with cobble sized clasts. Rock hammer for scale … Wikipedia
Sediment — Cobbles on a beach River Rhône flowing into Lake Geneva … Wikipedia

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