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Articles 4141 - 4143 of 4143
Full-Text Articles in Physical Sciences and Mathematics
Corrosion Par Mélange Des Eaux, Alfred Bogli
Corrosion Par Mélange Des Eaux, Alfred Bogli
International Journal of Speleology
Karst caves are prior to all due to corrosion. According to the well-known formula a CO2 supply is always needed. This type of dissolution explains only the corrosion in free circulation and, under reserve, the one in pressure conducts in the vadose zone. All corrosion in the phreatic domain is excluded, except for some rare cases in the upper levels. The corrosion by mixing of waters of different content in bicarbonates is effective in the entire karst, from the lowermost to the uppermost parts. Also the corrosion due to the lowering of temperature and by mixing of waters at …
Observations Sur L'Évolution Des Grottes, Albert Cavaillé
Observations Sur L'Évolution Des Grottes, Albert Cavaillé
International Journal of Speleology
In this note, which results from a paper published in France, the author defines the “karst system” formed by several successive levels, at the heart of a limestone mass: joints of surface feeding, vertical chimneys, galleries which are alternatively dry and full of water according to the season, a network of continually drowned clefts. He then studies modifications in this system resulting from internal causes, corrosion, filling and sedimentation, concretion. Then he shows how this evolution of the karst system may be modified by general conditions: geology, tectonics, geography with the losses, resurgences and the role of surface formations. The …
New Cavernicolous Millipeds Of The Family Cambalidae (Cambalidea: Spirostreptida) From Texas (U.S.A.) And Mexico, Nell B. Causey
New Cavernicolous Millipeds Of The Family Cambalidae (Cambalidea: Spirostreptida) From Texas (U.S.A.) And Mexico, Nell B. Causey
International Journal of Speleology
The cavernicoles include: (1) Cambala speobia (Chamberlin), troglobitic in central and southwest Texas; (2) C. reddelli reddelli n. sp. and subsp., troglophilic in west Texas and epigean in New Mexico; (3) C. reddelli inornatus n. subsp., troglobitic in northwest Texas; and (4) Mexicambala russelli n. gen. and sp., troglobitic in southern San Luis Potosi. They are described and figured, and a key is given.