 | | Report (issue) | | growth mechanism. This study has also sparked lively de bate among mineralogists as to what constitutes a...boney piles, or gob piles, are composed largely of rock, low-quality coal, and fine-grained resi due from...in sheltered areas. Sometimes just turning over a rock and exposing these gossamer forms to a gentle breeze...vertically and is related to differing relative rock competence under re gional and local stresses (Wood...addition, there is no way todetermine what other de briscould have beendisposed of at this location. |  | | Book (edition) | | Alpine fissures, as well as in sedimentary and metamorphic rocks and in residual and alluvial deposits...."Dana's System of Mineralogy•· ( 1944, I 951, 1962). de Fourestier (1999) and Strunz and Nickel (2001). Mi11eral...of Alpine fissures, of sedimentary, regional metamorphic, or weathering processes). Within each genetic...scientists. Since some mineral occurrences of metamorphic character (e.g. skams) may be formed by both...ASG -Archives de Science Geneve BM - Bulletin de la Societe fram;aise de mineralogie et de cristallographie |  | | Book | | RESUME. Les auteurs 1nontrent que Ies essais de datation de roches et d'evenements ordoviciens par des...certain nombre de raisons geologiques et radio-isotopiques. L'etat actuel de la chronologie de l'Ordovicien...l'Ordovicien et les perspectives de progres sont brievement discutes dans un contexte historique. Les donnees ordi:nairement...pourra etre degagee que lorsque seront disponibles de nombreuses dates isochroniques K-Ar et Rb-Sr stratigraphiquement...controlees et non opposees. 11s presentent comme base de discussion la geochronologie qui, d'apres leur interpretation |
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