- a sticky clay formed by the thorough weathering of glacial drift, the thickness of the clay furnishing means for comparing relative lengths of interglacial ages.
Origin of gumbotil
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a sticky clay formed by the weathering of glacial drift
C20: from gumbo + til (l) 4