Concepts

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definition : The layer is 50–90 percent cemented or compacted, and in general shows a regular appearance.

definition : Surface of coating is distinctly smoother or different in colour from the adjacent surface. Fine sand grains are enveloped in the coating but their outlines are still visible....

definition : Although not striking, the mottles are readily seen. The hue, chroma and value of the matrix are easily distinguished from those of the mottles. They may vary by as much as 2....