1. (n.) The study of the origin, history, and structure of the earth\; 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. See Chart of The Geological Series.

2. (n.) A treatise on the science.

cosmical geology crystallography dynamic geology geodesy geodetics geodynamics geognosy geographics geography geological chemistry geological engineering geomorphogeny geomorphology geophysics geoscopy geotectonic geology historical geology hydrogeology mineralogical chemistry mineralogy mining engineering mining geology paleontological geology pedology petrochemistry petrography petrology physical geography physical geology physiographic geology physiography soil mechanics soil science stratigraphic geology stratigraphy