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TitleGeology of Lower Ordovician fossiliferous strata between Virgin Arm and Squid Cove, New World Island, Newfoundland
DownloadFree download (whole publication) (pdf 21216 KB)
AuthorHorne, G S
SourceGeology of Lower Ordovician fossiliferous strata between Virgin Arm and Squid Cove, New World Island, Newfoundland; Early Ordovician (Late Arenig) brachiopods from Virgin Arm, New World Island, Newfoundland; by Horne, G S; Geological Survey of Canada, Bulletin 261, 1976 p. 1-9, https://doi.org/10.4095/123970
Year1976
PublisherDepartment of Energy, Mines and Resources Canada
Documentserial
Lang.English
Mediapaper
RelatedThis publication is contained in Horne, G S; Neuman, R B; (1976). Geology of Lower Ordovician fossiliferous strata between Virgin Arm and Squid Cove, New World Island, Newfoundland; Early Ordovician (Late Arenig) brachiopods from Virgin Arm, New World Island, Newfoundland, Geological Survey of Canada, Bulletin no. 261
ProvinceNewfoundland and Labrador
NTS2E/09; 2E/10
AreaNewfoundland; New World Island
Lat/Long WENS -55.0000 -54.0000 49.7500 49.5000
Subjectspaleontology; regional geology; bedrock geology; lithology; igneous rocks; volcanic rocks; volcaniclastics; basalts; tuffs; sedimentary rocks; limestones; argillites; pelites; greywackes; fossils; tectonic setting; plate margins; subduction zones; island arcs; paleogeography; depositional environment; marine environments; coastal environment; stratigraphic correlations; structural features; faults; Brachiopoda; Cobbs Arm Fault; Goldson Formation; Luke's Arm Fault; Summerford Group; Trilobita; Virgin-Village Fault; Cobbs Arm Sequence; Graptolites; Sansom Greywacke; Phanerozoic; Paleozoic; Silurian; Ordovician
Illustrationslocation maps; geological sketch maps; composite sections; stratigraphic sections; photographs; schematic cross-sections
Released1977 03 01; 2017 01 12
AbstractEarly Ordovician brachiopods, trilobites and other fossils occur in volcaniclastic strata of the Cobbs Arm Sequence exposed along the north-central coast of New World Island at the northern end of Newfoundland's central volcanic belt. The stratigraphic succession has been interpreted as representing the seaward margin of a volcanic island-arc system that was generated by the subductive closure of a hypothetical early Paleozoic seaway.
A pile of Lower and Middle Ordovician submarine basaltic extrusives 300 m thick contains thin and discontinuous beds of calcareous tuff and volcanogenic elastics with shallow-marine fossil assemblages. The volcanics are succeeded by about I 0 m of fossiliferous Middle Ordovician limestone, which is overlain by approximately 75 m of black, graptolitic Upper Ordovician argillite. The upper part of the succession consists of 50 m of penecontemporaneously distorted pelitic strata that gradationally coarsen upwards into well stratified greywacke of Late Ordovician and Early Silurian age.
The stratigraphic sequence may be correlated with both the Summerford Group to the southwest and the Hillgrade Group to the northeast. The faunas are characterized by peculiar generic associations, some of which are unknown elsewhere. Paleogeographic interpretations suggest the faunas inhabited coastal waters surrounding volcanic isles within an Early Ordovician ocean.
GEOSCAN ID123970