horn coral

▪ fossil order
      any coral of the order Rugosa, which first appeared in the geologic record during the Ordovician Period, which began 488 million years ago; the Rugosa persisted through the Permian Period, which ended 251 million years ago. Horn corals, which are named for the hornlike shape of the individual structures built by the coral animal, were either solitary or colonial forms. Of the many forms known, some are important as index, or guide, fossils for specific spans of geologic time and serve to correlate sometimes widely separated rock units. Because of their mode of growth, some horn corals have been employed as biological clocks to determine the length of the day and year in the distant geologic past.

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Universalium. 2010.

Look at other dictionaries:

  • Stag-horn coral — Stag horn cor al (st[a^]g h[^o]rn k[o^]r al), Stag horn fern Stag horn fern (f[ e]rn ), etc. See under {Stag}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Stag-horn coral — Stag Stag (st[a^]g), n. [Icel. steggr the male of several animals; or a doubtful AS. stagga. Cf. {Steg}.] 1. (Zo[ o]l.) (a) The adult male of the red deer ({Cervus elaphus}), a large European species closely related to the American elk, or wapiti …   The Collaborative International Dictionary of English

  • elk|horn coral — «EHLK HRN», a very poisonous stony coral with a branched skeleton resembling somewhat the antlers of an elk …   Useful english dictionary

  • stag's-horn coral — noun large branching coral resembling antlers • Syn: ↑staghorn coral • Hypernyms: ↑stony coral, ↑madrepore, ↑madriporian coral • Member Holonyms: ↑Acropora, ↑genus Acropora …   Useful english dictionary

  • stag's-horn coral — /stagz hawrn /. See staghorn coral. [1880 85] * * * …   Universalium

  • Coral Harbour — ᓴᓪᓕᖅ/ᓴᓪᓖᑦ Salliq/Salliit   Hamlet   Coral Harbour …   Wikipedia

  • Horn-Linie — GmbH Co Rechtsform Kommanditgesellschaft Gründung 1879 Sitz …   Deutsch Wikipedia

  • madriporian coral — noun corals having calcareous skeletons aggregations of which form reefs and islands • Syn: ↑stony coral, ↑madrepore • Hypernyms: ↑coral • Hyponyms: ↑brain coral, ↑staghorn coral, ↑ …   Useful english dictionary

  • stony coral — noun corals having calcareous skeletons aggregations of which form reefs and islands • Syn: ↑madrepore, ↑madriporian coral • Hypernyms: ↑coral • Hyponyms: ↑brain coral, ↑staghorn coral, ↑ …   Useful english dictionary

  • staghorn coral — noun large branching coral resembling antlers • Syn: ↑stag s horn coral • Hypernyms: ↑stony coral, ↑madrepore, ↑madriporian coral • Member Holonyms: ↑Acropora, ↑genus Acropo …   Useful english dictionary

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