An authigenic mineral or
Wikimedia Foundation. 2010.
authigenic — /aw thi jen ik/, adj. Geol. (of a constituent of a rock) formed in the rock where it is found. Cf. allogenic (def. 1). [1885 90; < G Authigen < Gk authigenés native to a specific place (aûthi there + genes born) + IC; see GENIC] * * * … Universalium
authigenic — adjective In the rock; refers to minerals within sedimentary layers. Generated where it is found or observed … Wiktionary
authigenic — Formed or generated in place [1]. See also allogenic; recharge, autogenic; recharge, allogenic … Lexicon of Cave and Karst Terminology
authigenic — au·thi·gen·ic … English syllables
authigenic — … Useful english dictionary
Cold seep — Marine habitats Tube worms are among the dominant species in one of four cold seep community types in the Gulf of Mexico. Littoral zone … Wikipedia
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
Fossil — For other uses, see Fossil (disambiguation). Three small ammonite fossils, each approximately 1.5 cm across … Wikipedia
Richard L. Hay — Richard LeRoy Hay (April 29 1929 ndash; February 10 2006) was an American geologist whose most famous work was as the principal geologist working with Mary Leakey at Olduvai Gorge, the site of many important hominid finds in the study of human… … Wikipedia
bathyal zone — ▪ oceanography marine ecologic realm extending down from the edge of the continental shelf to the depth at which the water temperature is 4° C (39° F). Both of these limits are variable, but the bathyal zone is generally described as lying… … Universalium
