2023-06-092023-06-091932https://hdl.handle.net/2346/93963image/jpegUnder Copyright. Please contact Assistant Curator of Paleontology Dr. Kendra Dean-Wallace at kendra.dean@ttu.edu for research requests.Igneous rocksPetrologyRocks Classification and nomenclatureA Descriptive Petrography of the Igneous Rocks, Volume II: The Quartz-Bearing Rocks.Image1141065844