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| | [No title] |
 | | Dawsonite in the analcimolites of Richat, Adrar, Mauritania AU: Author Blanc, Philippe; Pomerol, Charles; Maury, Roger SO: Source Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, Serie D: Sciences Naturelles, vol.272, no.8, pp.1041-1043, 1971 IS: ISSN 0567-655X CD: CODEN CHDDAT PB: Publisher Gauthier-Villars, Paris, France (FRA) LA: Language French FE: Features illus. |
 | | Further investigations are necessary, however, to establish the origin of the dome, now extensively eroded, in view of the fact that proof is not yet conclusive that coesite is invariably due to the fall of an extra-terrestrial body. |
 | | This identification lends support to the hypothesis that there was originally an explosion crater in the center of the Richat and that a subsurface ring structure may be present. |
| www.sahara-trekking.de /seiten/Richat_bei_GeoRef.txt (1926 words) |
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