Where oolites

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• Oolite — For other uses, see Oolite (disambiguation). Modern ooids from a beach on Joulter s Cay, The Bahamas …   Wikipedia

• Maquoketa Group — Paleozoic Stratigraphy of the Upper Midwest, USA Dates are approximate, and deposition occurred at slightly different times in different areas This box: view · talk · …   Wikipedia

• Microspherulite — Microspherulites are microscopic spherical particles with < 2 mm diameters, usually in the 100 micrometre range, mainly consisting of mineral material (the Greek litos means stone ). Only bodies created by natural physico chemical… …   Wikipedia

• oolite — oolitic /oh euh lit ik/, adj. /oh euh luyt /, n. Geol. a limestone composed of minute rounded concretions resembling fish roe, in some places altered to ironstone by replacement with iron oxide. Also called egg stone. [1775 85; ( < F oölithe) …   Universalium

• Burgsvik beds — The Burgsvik beds are a sequence of shallow marine limestones and sandstones found near the town of Burgsvik in the southern part of Gotland, Sweden. The beds were deposited in the Upper Silurian period, around Ma|420, in warm, equatorial waters… …   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

• sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… …   Universalium

• Somerset — This article is about the county of Somerset in England. For other uses, see Somerset (disambiguation). Somerset Motto of County Council: Sumorsǣte ealle ( All The People of Somerset ) …   Wikipedia

• Microbial mat — A microbial mat is a multi layered sheet of micro organisms, mainly bacteria and archaea. Microbial mats grow at interfaces between different types of material, mostly on submerged or moist surfaces but a few survive in deserts.[1] They colonize… …   Wikipedia

• Miami — This article is about the city in Florida. For other uses, see Miami (disambiguation). Miami   City   …   Wikipedia

• Evolutionary history of life — Although evidence of early life is scarce and often difficult to interpret, it appears that life appeared on Earth relatively soon (on the geologic time scale) after the planet had cooled enough for liquid water to be present. The dominant theory …   Wikipedia