Definitions for "C horizon"
The lowest zone of soil consisting of partly decomposed bedrock underlying the B horizon. It grades downward into fresh, unweathered bedrock.
The soil horizon below the B horizon and above the R horizon. This layer comprises weathered bedrock.
The mineral horizon or layer, excluding hard bedrock, that is little affected by soil-forming processes and does not have the properties typical of the overlying horizon. The material of a C horizon may be either like or unlike that in which the solum is formed. If the material is known to differ from that in the solum, an Arabic numeral, commonly a 2, precedes the letter C.
Keywords:  parent, material
parent material