lə̇ˈthäləjē, -ji noun
( -es )
Etymology: lith- + -logy
1. : the study of rocks
2. : the character of a rock formation or of the rock found in a geological area or stratum expressed in terms of its structure, mineral composition, color, and texture
a relation between the fossil content of a stratum and its lithology — F.J.Pettijohn