gypsiferous shale

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• Arctomecon humilis — Taxobox name = Arctomecon humilis regnum = Plantae divisio = Magnoliophyta classis = Magnoliopsida ordo = Ranunculales familia = Papaveraceae genus = Arctomecon species = A. humilis binomial = Arctomecon humilis binomial authority = Coville… …   Wikipedia

• Silurian Period — Interval of geologic time, 443–417 million years ago. The third period of the Paleozoic Era, the Silurian follows the Ordovician Period and precedes the Devonian. It marks the first appearance of land plants and jawed fishes. The continents were… …   Universalium

• Nubian Sandstone Aquifer System — The Nubian Sandstone Aquifer System (NSAS) is the world’s largest known fossil water aquifer system. It is located underground in the Eastern end of the Sahara Desert and spans the political boundaries of four countries in north eastern… …   Wikipedia

• Purbeckian — In geology, the Purbeckian refers to the highest and youngest member of the Jurassic system of rocks, also known as the Purbeck Beds. Either name is derived from the district known as the Isle of Purbeck in Dorset where the strata are splendidly… …   Wikipedia