chalk

   1. Used as a proper noun chalk describes a rock unit of Cretaceous age, that consists predominately of relatively soft, white, porous limestone with beds of marl and bands or nodules of flint. The term is used without its initial capital to describe any rock with similar appearance and properties. Generally chalk has a relatively high primary permeability and so rarely develops caves of explorable size, though conduit-water flow does occur. Some harder chalks in northern France and south-eastern England hold explorable active and relict caves, which extend for many hundreds of meters [9].
   2. Soft poorly indurated limestone, generally light in color; commonly composed of the tests of floating microorganisms in a matrix of very finely crystalline calcite [10].

A Lexicon of Cave and Karst Terminology with Special Reference to Environmental Karst Hydrology. . 2002.

Look at other dictionaries:

  • chalk — chalk·er; …   English syllables

  • Chalk — (ch[add]k), n. [AS. cealc lime, from L. calx limestone. See {Calz}, and {Cawk}.] 1. (Min.) A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as common… …   The Collaborative International Dictionary of English

  • chalk — [chôk] n. [ME < OE cealc < L calx, lime, limestone: see CALCIUM] 1. a white, gray, or yellowish limestone that is soft, porous, and easily pulverized, composed almost entirely of calcite from minute sea shells 2. any substance like chalk in …   English World dictionary

  • Chalk — Chalk, v. t. [imp. & p. p. {Chalked}; p. pr. & vb. n. {Chalking}.] 1. To rub or mark with chalk. [1913 Webster] 2. To manure with chalk, as land. Morimer. [1913 Webster] 3. To make white, as with chalk; to make pale; to bleach. Tennyson. [1913… …   The Collaborative International Dictionary of English

  • chalk — ► NOUN 1) a white soft limestone (calcium carbonate) formed from the skeletal remains of sea creatures. 2) a similar substance (calcium sulphate), made into sticks and used for drawing or writing. ► VERB 1) draw or write with chalk. 2) Brit.… …   English terms dictionary

  • chalk|y — «CH kee», adjective, chalk|i|er, chalk|i|est. 1. of chalk; containing chalk: »The blackboard eraser was full of chalky dust. 2. like chalk; white as chalk: »The clown s …   Useful english dictionary

  • chalk — [tʆɔːk ǁ tʆɒːk] verb chalk up something phrasal verb [transitive] to succeed in getting something or reaching a total: • The big oil companies continued to chalk up huge profits …   Financial and business terms

  • Chalk — (engl. für Kreide) ist der Name eines kommerziellen Jugendmagazins, das in Österreich an den meisten höheren Schulen gratis aufliegt. Das 52seitige Heft erreicht ca. 105.000 Schüler, neben aktuellen CD , Buch , PC , TV Kritiken und diversen… …   Deutsch Wikipedia

  • chalk... — chalk..., Chalk... [ç...] vgl. ↑chalko..., Chalko …   Das große Fremdwörterbuch

  • chalk up to — chalk (something) up to (something else) to say that something is caused by something else. She doesn t even bother to say thank you, but I just chalk it up to bad manners and try not to let it bother me …   New idioms dictionary

  • chalk up — (something) to record something special. Many banks chalked up large profits from their loans to internet companies. Etymology: based on the idea of keeping a record on a chalk board …   New idioms dictionary

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