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Late Paleozoic Era diastrophism with possible origin in Late Devonian Period, continuing until the end of the Permian Period. A mountain forming period for deposits in the Appalachian and Cordilleran geosynclines

Light-colored igneous rock characterized by fine-grained saccharoidal texture, ranging in composition from gabbro to granite, consisting of quartz, potassium feldspar, and high acid plagioclase

The texture of igneous rock in which crystalline components are too small to be detected visually by the unaided eye. Syn. Cryptocrystalline

The top or terminal edge of 2 or more points of a geological structure

A hexagonal or monoclinic pseudohexagonal mineral with the general formula A5(XO4)3(F,Cl,OH) , where A = (Ba,Ca,Ce,K,Na,Pb,Sr,Y) and X = (As,C,P,Si,V). Calcium Phosphate

A fixed iron block used as a base for hammer forging steel

An extremely brittle metal with a crystalline, flaky texture. Symbol, Sb

A folding or arching of layered rock

Coal containing a low percentage of volatile matter and having a high percentage of fixed carbon

A variation from what is expected or normal, occurring outside of any pattern or prediction