Geology \Ge*ol"o*gy\, n.; pl. {Geologies}. [Gr. ge`a, gh^, the
earth + -logy: cf. F. g['e]ologie.]
1. The science which treats:
(a) Of the structure and mineral constitution of the
globe; structural geology.
(b) Of its history as regards rocks, minerals, rivers,
valleys, mountains, climates, life, etc.; historical
geology.
(c) Of the causes and methods by which its structure,
features, changes, and conditions have been produced;
dynamical geology.

2. A treatise on the science.

Note: The science of geology, as treating of the history of
the globe, involves a description of the different
strata which compose its crust, their order of
succession, characteristic forms of animal and
vegetable life, etc. The principal subdivisions of
geological time, and the most important strata, with
their relative positions, are often indicated in a
diagram called "The Geological Series"