calcareous layer
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Alkali soils — Alkali, or alkaline, soils are clay soils with a relatively high exchangeable sodium percentage, a relative high pH (> 9), a poor soil structure and a low infiltration capacity. Often they have a hard calcareous layer at 0.5 to 1 m. depth (in… … Wikipedia
Oil shale geology — Main article: Oil shale Outcrop of Ordovician kukersite oil shale, northern Estonia. Oil shale geology is a branch of geologic sciences which studies the formation and composition of … Wikipedia
hypostracum — n. [Gr. hypo, under; ostrakon, shell] 1. (ARTHROPODA: Chelicerata) In Acari, the inner cuticular layer, usually pigmented with basic dyes. 2. (MOLLUSCA: Bivalvia) a. Inner layer of shell wall laid down by the mantle. b. That part of the shell… … Dictionary of invertebrate zoology
Oil shale in Estonia — Outcrop of Ordovician kukersite oil shale, northern Estonia Oil shale in Estonia is an important resource for the national economy. Estonia s oil shale deposits account for just 17% of total deposits in the European Union but the country… … Wikipedia
Kukersite — is a marine type oil shale of Ordovician age, found in the Baltic Oil Shale Basin in Estonia and North West Russia. It was named after Kukruse settlement in Estonia in 1917 by Russian paleontologist Mikhail Zalessky.Cite journal last =Lille |… … Wikipedia
tegmentum — n. [L. tegere, to cover] (MOLLUSCA: Polyplacophora) The outer, sometimes softer and porous calcareous layer of the valve below the periostracum … Dictionary of invertebrate zoology
chestnut soil — /tʃɛsnʌt ˈsɔɪl/ (say chesnut soyl) noun a crumbly, dark brown soil overlaying a lighter calcareous layer, found in the drier steppes south of the black earth …
известковый слой — — [http://slovarionline.ru/anglo russkiy slovar neftegazovoy promyishlennosti/] Тематики нефтегазовая промышленность EN calcareous layer … Справочник технического переводчика
skeleton — skeletonless, adj. skeletonlike, adj. /skel i tn/, n. 1. Anat., Zool. the bones of a human or an animal considered as a whole, together forming the framework of the body. 2. any of various structures forming a rigid framework in an invertebrate.… … Universalium
integument — /in teg yeuh meuhnt/, n. 1. a natural covering, as a skin, shell, or rind. 2. any covering, coating, enclosure, etc. [1605 15; < L integumentum a covering. See IN 2, TEGUMENT] Syn. 1. cortex, involucre, involucrum. * * * Covering of the body,… … Universalium
sponge — spongeless, adj. spongelike, adj. spongingly, adv. /spunj/, n., v., sponged, sponging. n. 1. any aquatic, chiefly marine animal of the phylum Porifera, having a porous structure and usually a horny, siliceous or calcareous internal skeleton or… … Universalium