A red clay from the Upper Missouri region, used by the natives for their pipes.
Mud or fine earth deposited from running or standing water.
Material with similar physical characteristics, whatever its origins or transport.
A particle from 3.9 to 62.5 microns in diameter, following the Wentworth scale.
To flow through crevices; to percolate.
To clog or fill with silt.
To become clogged with silt.