Petrology description of rocks while petrography is the speciality that deals with microscopic details. In the petroleum industry, lithology, or more specifically mud logging, is the graphic representation of geological formations being drilled through, and drawn on a log called a mud log. As the cuttings are circulated out of the borehole they are sampled, examined (typically under a 10× microscope) and tested chemically when needed. Petrology utilizes the fields of mineralogy, petrography, optical mineralogy, and chemical analysis to describe the composition and texture of rocks. Petrologists also include the principles of geochemistry and geophysics through the study of geochemical trends
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