. Report of the fifty-fourth meeting of the British Association for the Advancement of Science [microform] : held at Montreal in August and September 1884. Congresses and conventions; Science; Congrès et conférences; Sciences. 27G ItEPORTâl»84. â¢1 i i iiii iiJ I Wilili«. cousistinj^ of agglomoratop, tnfls, ami bods of fclspatliio (nip. The autlior is dipposod to concur witli J)r. Lartct in coiisidcriii;^ tlu; p^ inul granitoid rocks to bo of archa^an (or Laurentian) age, as they aie ])io- bably representative of those of Assouan in Upper Egypt, wliich J'riju'ipal Dawson lias rec
. Report of the fifty-fourth meeting of the British Association for the Advancement of Science [microform] : held at Montreal in August and September 1884. Congresses and conventions; Science; Congrès et conférences; Sciences. 27G ItEPORTâl»84. â¢1 i i iiii iiJ I Wilili«. cousistinj^ of agglomoratop, tnfls, ami bods of fclspatliio (nip. The autlior is dipposod to concur witli J)r. Lartct in coiisidcriii;^ tlu; p^ inul granitoid rocks to bo of archa^an (or Laurentian) age, as they aie ])io- bably representative of those of Assouan in Upper Egypt, wliich J'riju'ipal Dawson lias recently identified with those of this age. The granites and porphyries are traversed b}' innumerable dykes of porphyi'y and dioritc, both throughout the Sinaio mountains and those of Edom and !Moab; and the author considers it probable that the volcanic rocks which are lai'gely represented along the base of !Monnt llor, and of Jebel Sonirali near Ivs Satieh, are contemporaneous with these dykes. As far as the author \viis> able to observe, none of these dykes penetrate the Desert or Xubiim sandstones, and if so, they nnvy be considered of pre-carbonifcrons ago. The upper surface of the ancient rocks was extremely uneven jirevionslv to the deposition of the Desert .sandstone, having been Avorn and deMiidcd into ridges and hollows ; over this irregular iloor the sandstone strata wevc deposited. '4. The occurrence of terraces of marl, gravel, andsili, through which the ravines of existing streams have been cut at an elevation (according ti> aneroid determination) of about 100 feet above the level of the ]\[ediicr- ranean, was taken to show that the level of the Salt Sea (Bahr liut) wt onetime stood about 1,100 feet higher than ',>'â ])rescnt. These-beds of marl Averc first observed at tne camp at Ain A ,.i iJeweircih ; they contain blanched shells of the genera ^Mull(|/tâ â <iâ â < and Mnlmiid. The beds of marl Avere observed to bo enclosed by higher g
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1885
