What does "Cd" represent in soil descriptions?

In soil descriptions, "Cd" specifically refers to a dense, unconsolidated sediment. This term is often used in soil classification systems to indicate a layer that has not been compacted to the point where it becomes a solid rock or bedrock but is denser than the surrounding layers. The implication of "Cd" in soils is significant as it denotes soil with specific physical properties that can impact drainage, root penetration, and overall soil ecology. Understanding the characteristics of a Cd layer can help evaluators assess soil behavior during engineering projects or agricultural practices, particularly concerning water retention and structural stability. The other options refer to different soil types or conditions that do not accurately represent what "Cd" signifies in the context of soil descriptions.