Bollettino della Società geologica d'America . om l'Oceano Artico e più a sud-est. Koch^* si riferisce alla realizzazione delle montagne di L^nited States ai Cale-BS Lauge Kocb : Stratigrafia della Groenlandia nordoccidentale. Meddel. Dansk. Geol. FOREN.,vol. 5, n. 17, 1920, pp-1-78. Relazione PreliminatT sulla geologia di Peary Land,.Artico Groenlandia. Amer. Tour. Sci. (5), vol. 5, 1923, pp. 189-199. SCHUCHERT LA deformazione doniana NORDAMERICANA GEOSYNCLIXES del tardo tempo siluriano, ma, poiché almeno gli strati Penn-sylvanian sono coinvolti nella piegatura, è chiaro che l'origine di questi range

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Bulletin of the Geological Society of America . om the Arctic Ocean and towardthe southeast. Koch^* refers the making of the L^nited States Mountains to the Cale-bs Lauge Kocb : Stratigraphy of northwest Greenland. Meddel. dansk. geol. Foren., voL 5, no. 17, 1920, pp- 1-78. PreliminatT report upon the geology of Peary Land, .Arctic Greenland. Amer. .Tour. Sci. (5), vol. 5, 1923, pp. 189-199. 194 C. SCHUCHERT THE NORTH AMERICAN GEOSYNCLIXES donian deformation of late Silurian time, but, since at least the Penn-sylvanian strata are involved in the folding, it is clear that the origin ofthese ranges can not be older than late Pennsylvanian time. On theother hand, the Triassic strata appear to be unfolded and may representa transgression restricted to the southwestern and more open remainder•of the Franklinian geosyncline. Xature of ]Ieditekraxeaxs compared avith Geostxclixes gexeral discussiox The American theory of geosynclines is widely accepted by the Euro-peans, but their typical area for this structure is the mountains of south-. EiGLRE 18.—TTorhJ Chart sltoicing Geosi/iiclines and hypothetic Continents during Mesozoic Time After Haug, 1909. from Ruedemann. 1922. crn Europe and the Roman Mediterranean, extending into Asia, the site?of a former greater mediterranean (see fig-ure 18). To this very extensiveseaway of the geologic past, Suess many years ago gave the name Tethys.•Since Tethys was the consort of Oceanus, we see in this linkage of thegods also the idea that mediterraneans have the characteristics of oceans.This is true of mediterraneans in nearly all of their physical aspects•except as to size and shape, since their typical form is that of elongate MEDITERRAXEAXS COMPARED WITH GEOSYNCLIXES 195 oceans that are much more completely hemmed in by continents. It istrue, however, that both types of marine areas are greatly depressed deep-water basins situated hetiveen continents. Geosynclines, in the Americansense, on the other hand, are long and narrow

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• bookcentury1800
• bookdecade1890
• booksubjectgeology
• bookyear1890