Which horizon in a soil profile consists of bedrock?

The horizon in a soil profile that consists of bedrock is known as the "R horizon." This horizon is the lowest layer in the soil profile and is comprised of unweathered parent material, often solid bedrock or partially weathered rock. The R horizon is the least weathered layer and typically shows minimal evidence of soil development. It is regarded as the base of the soil profile and may be exposed or only partially covered by other soil horizons. Its composition and characteristics contribute to the overall stability and fertility of the soil system.