slaty fracture
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Cleavage (geology) — This article is about rock cleavage, for cleavage in minerals see Cleavage (crystal) Different ways in which a cleavage can develop in a sedimentary rock. A: original sedimentary rock; B: pencil cleavage; C: diagenetic foliation (parallel to… … Wikipedia
Marcellus Formation — Stratigraphic range: Middle Devonian … Wikipedia
phyllite — phyllitic /fi lit ik/, adj. /fil uyt/, n. a slaty rock, the cleavage planes of which have a luster imparted by minute scales of mica. [1820 30; PHYLL + ITE1] * * * Fine grained metamorphic rock formed by the recrystallization of fine grained,… … Universalium
metamorphic rock — Any of a class of rocks that result from the alteration of preexisting rocks in response to changing geological conditions, including variations in temperature, pressure, and mechanical stress. The preexisting rocks may be igneous, sedimentary,… … Universalium
John Tyndall — Infobox Scientist name = John Tyndall caption = John Tyndall. birth date = August 2, 1820 birth place = Leighlinbridge, County Carlow, Ireland death date = December 4, 1893 (aged 73) death place = Surrey, England residence = nationality = British … Wikipedia
Geology of Tasmania — Tasmania has a varied geological history, with the world s biggest exposure of diabase, or dolerite. Rocks from the Neoproterozoic, Paleozoic and Mesozoic time periods appear. It is one of the few southern hemisphere areas glaciated during the… … Wikipedia
tuatara — /tooh euh tahr euh/, n. a large, primarily nocturnal, lizardlike reptile, Sphenodon punctatum, of islands near the coast of New Zealand: the only surviving rhynchocephalian. Also, tuatera /tooh euh tair euh/. Also called sphenodon. [1810 20; … Universalium
