Research Article| October 01, 1984 The West African connection—Evolution of the central Atlantic Ocean and its continental margins John Rodgers; John Rodgers 1Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06511 Search for other works by this author on: GSW Google Scholar Jean Sougy; Jean Sougy 2Laboratoire associé au CNRS no. 132, Etudes géologiques ouest-africaines, 13997 Marseille CEDEX 13, France Search for other works by this author on: GSW Google Scholar Frances Delany; Frances Delany 3No affiliation available Search for other works by this author on: GSW Google Scholar René Dame René Dame 3No affiliation available Search for other works by this author on: GSW Google Scholar Author and Article Information John Rodgers 1Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06511 Jean Sougy 2Laboratoire associé au CNRS no. 132, Etudes géologiques ouest-africaines, 13997 Marseille CEDEX 13, France Frances Delany 3No affiliation available René Dame 3No affiliation available Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1984) 12 (10): 635–636. https://doi.org/10.1130/0091-7613(1984)12<635:TWACOT>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation John Rodgers, Jean Sougy, Frances Delany, René Dame; The West African connection—Evolution of the central Atlantic Ocean and its continental margins. Geology 1984;; 12 (10): 635–636. doi: https://doi.org/10.1130/0091-7613(1984)12<635:TWACOT>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract No Abstract Available. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Way-up criteria in the Mageroy sequence of central Mageroya indicate that the sequence there is not overtumed and that the fossiliferous rocks and their correlatives Iie in synforms at the top of the sequence, passing downward through pelitic rocks into greywacke turbidites, which we equate with the Hellefjord Schist Group on the islands farther west and on Porsangerhalvoya . The basal contact of the supposed 'Mageroy Nappe' over the top of the Kalak Nappe Complex in western Mageroya closely resembles and is probably equivalent to the basal contact of the Hellefjord schist as exposed on Havoya and Porsangerhalvoya within the nappe complex. If so, the Mageroy sequence is an integral part of the Kalak Nappe Complex, and its Silurian fossils would show that the stacking of the Kalak Nappes was Scandian, not Finnmarkian. The Skarsvag Nappe of northeastern Mageroya includes not only high-grade regional metamorphic rocks but in o ur view aiso the underlying Skarsvag and Opnan granites, which are equivalent and probably a single continuous granitic sheet. The Skarsvag Nappe clearly overlies the Mageroy sequence, whereas the turbidites of the Honningsvag unit may have been faulted upward from near the base of the Mageroy sequence.
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Research Article| May 01, 1971 The Taconic Orogeny JOHN RODGERS JOHN RODGERS Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06520 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1971) 82 (5): 1141–1178. https://doi.org/10.1130/0016-7606(1971)82[1141:TTO]2.0.CO;2 Article history received: 25 Jan 1971 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation JOHN RODGERS; The Taconic Orogeny. GSA Bulletin 1971;; 82 (5): 1141–1178. doi: https://doi.org/10.1130/0016-7606(1971)82[1141:TTO]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The Taconic orogeny of eastern North America was not, as traditionally defined, a single orogenic event that occurred at the end of the Ordovician period, but rather a complex series of orogenic episodes or climaxes spread over the larger part of that period. In most sectors of the northern Appalachians it included at least three of the following: disconformity in an external belt where carbonate was accumulating; severe early deformation in an internal volcanic belt; gravity slides from internal uplifts into the external belt; and widespread deformation, especially in the more external belts. In general, these events did not occur at the same time in the various sectors; each took a considerable time, and they overlapped to some extent. The Taconic orogeny also affected the southern Appalachians and may have been the most important one there, but evidence for this assertion is meager and inconclusive. Detailed analysis of the "fine structure" of the Taconic orogeny combats the dogma that orogenies are sharp, discrete events punctuating the geologic record (separating periods and abruptly terminating geosynclinal sedimentation) and suggests instead that they reflect "random-walk" processes within the Earth, in all likelihood the same as those responsible for sea-floor spreading and the present tectonic state of the Earth. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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