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Diolch yn fawr. Ond rois i 'calcrit' (fel 'concrit') Dwi'm yn hoff iawn o 'concrid'. Geraint ----- Original Message ----- From: "Ann Corkett" <[log in to unmask]> To: <[log in to unmask]> Sent: Wednesday, March 31, 2004 3:27 PM Subject: Re: calcrete Yn ol y We, mae calcrete yr un peth a caliche. Dyma dri diffiniad o http://www.glossary.oilfield.slb.com/Display.cfm?Term=caliche caliche 1. n. [Geology] ID: 68 A crust of coarse sediments bound by carbonate cement that formed by precipitation. 2. n. [Geology] ID: 69 A weathered soil rich in calcium carbonate. It forms when lime-rich groundwater rises to the surface by capillary action and evaporates into a crumbly powder, forming a tough, indurated sheet called calcrete. Caliche typically occurs in desert or semi-arid areas. Of particular concern to geophysicists is the difficulty in acquiring good seismic data when shooting through a layer of caliche. 3. n. [Geology] ID: 70 A deposit of sodium nitrate that is mined and used for fertilizer in parts of South America. Awgym Bruce yw "calcrid". Ann ----- Original Message ----- From: "Geraint Løvgreen" <[log in to unmask]> To: <[log in to unmask]> Sent: Wednesday, March 31, 2004 11:35 AM Subject: calcrete Term daearegol - calcrete horizons - terfynlinau calcrit??? Diolch am unrhyw ymateb!