Petrology Petrology Petrology (from the Greek πέτρος, "pétros", "rock" and λόγος, "lógos", "subject matter", see -logy) is the branch of geology that studies rocks and the conditions under which they form. Petrology has three subdivisions: igneous, metamorphic, and sedimentary petrology. Igneous and metamorphic petrology are commonly taught together because they both contain heavy use of chemistry, chemical methods, and phase diagrams. Sedimentary petrology is, on the other hand, commonly taught together with stratigraphy because it deals with the processes that form sedimentary rock. Lithology was once approximately synonymous with petrography, but in current usage, lithology focuses on macroscopic hand-sample or outcrop-scale
Fossil and Petrology collections, New South Wales Fossil and Petrology collections, New South Wales The Fossil and Petrology collections are two heritage-listed fossil and petrology collections located at 947-953 Londonderry Road, Londonderry, City of Penrith, New South Wales, Australia. The collections are owned by the NSW Department of Primary Industries, a department of the Government of New South Wales. It was added to the New South Wales State Heritage Register on 2 April 1999. The fossil collection is assessed as State Significance. Fossils by their nature are unique and irreplaceable; unlike extant organisms, they can not be replaced. The fossil collections of the Geological Survey of NSW