Alluvium
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Alluvium is loose clay, silt, sand, or gravel that has been deposited by running water in a stream bed, on a floodplain, in an alluvial fan or beach, or in similar settings. Alluvium is also sometimes
Alluvium deposits in the Gamtoos Valley in South Africa
An alluvial plain in Red Rock Canyon State Park (California)
Alluvial river deposits in the Amazon basin, near Autazes, AM, Brazil. The seasonal deposits are extremely fertile and crucial to subsistence farming in the Amazon Basin along the river banks.
Bedrock
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In geology, bedrock is the solid rock that lies under weathered rock and unconsolidated or loose superficial deposits in the near surface part of Earth's crust or the crust of another terrestrial plan
Alluvium
…included under the term "alluvium". Most alluvium is Quaternary in age and is often referred to as "cover" because these sediments obscure the underlying bedrock. Most sedimentary material that fills a basin ("basin fill") that is not lithified is typically lumped together as "alluvial". Alluvium of Pliocene age…
Soil with broken rock fragments overlying bedrock at Sandside Bay, Caithness, Scotland