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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Arctic region
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Atlantic Ocean
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Escuminac Bay
Sedimentation and Paleoecology of the Devonian Escuminac Formation and Related Strata, Escuminac Bay, Quebec
In a revision of Devonian stratigraphy in the Escuminac Bay area, Quebec, Canada, the Escuminac and Fleurant Formations are retained within the Upper Devonian; the Pirate Cove Formation is regarded as Lower or Middle Devonian, which is based on its conformity with the underlying beds of known Lower or Middle Devonian age and because it is unconformably overlain by the Fleurant. The Escuminac, Fleurant, and Pirate Cove sediments were deposited in a complex of alluvial fans, flood plains, river channels, and lakes. The Pirate Cove Formation contains angular limestone-clast “fanglomerates,” channeled and ripple-bedded sandstones and shales, and is transitional into the underlying “Gaspé Sandstones.” In contrast, the Fleurant Formation is exclusively a mixed roundstone conglomerate clearly indicative of fluvial origin and intimately associated with the overlying Escuminac fish-bearing beds. The Escuminac Formation contains several shale members separated by a number of sandstone-shale units. Both “varved” and pyritiferous horizons are recognized. Environmental interpretation of this formation, based on fossils, lithologies, and primary sedimentary structures, suggests a fresh- to brackish-water lacustrine regime in which sand-laden density underflows periodically occurred. These turbid currents had a locally profound effect on the benthonic fish fauna of the lake. Throughout Escuminac time a unimodal current pattern from east to west was maintained. Some attempt is made to fit these local paleoenvironments into a regional picture of Devonian continental sedimentation.
Wisconsinan glacial and sea-level history of Maritime Canada and the adjacent continental shelf: A correlation of land and sea events
Stratigraphy, tectono-sedimentary evolution and paleogeography of the post-Taconian–pre-Carboniferous Gaspé Belt: an overview
Notice of transfer of the University of Minnesota paleontology collections to Cincinnati Museum Center
NEW FLAT-BACKED ARCHIPOLYPODAN MILLIPEDES FROM THE UPPER DEVONIAN OF NORTH AMERICA
Ontogeny of Euphanerops longaevus from the Upper Devonian Miguasha Fossil–Fish–Lagerstätte and comparison with the skeletogenesis of the sea lamprey Petromyzon marinus
A MICROANATOMICAL AND HISTOLOGICAL STUDY OF THE PAIRED FIN SKELETON OF THE DEVONIAN SARCOPTERYGIAN EUSTHENOPTERON FOORDI
Stratigraphy, depositional setting, and diagenetic history of the Saint-Jules Formation (Upper Devonian or Mississippian), a newly identified post-Acadian red clastic unit in the southern Gaspé Peninsula, Quebec
Paleogeography and tectono-sedimentary history at the margin of Laurentia during Silurian to earliest Devonian time: The Gaspé Belt, Québec
The Drift des Demoiselles on the Magdalen Islands (Québec, Canada): sedimentological and micromorphological evidence of a Late Wisconsinan glacial diamict
Early Devonian eurypterids from the Northwest Territories of Arctic Canada
Late-glacial stratigraphy and history of the Gulf of St. Lawrence: Discussion
A NEW EURYPTERID (CHELICERATA) FROM THE UPPER ORDOVICIAN OF MANITOULIN ISLAND, ONTARIO, CANADA
The Early Devonian eurypterid Leiopterella tetliei from Arctic Canada
A NEW ACTINOPTERYGIAN FROM THE FAMENNIAN OF EAST GREENLAND AND THE INTERRELATIONSHIPS OF DEVONIAN RAY-FINNED FISHES
A VERTEBRATE FAUNA FROM THE MIDDLE DEVONIAN YAHATINDA FORMATION OF SOUTHWESTERN CANADA
Abstract Glacier process models of till genesis cannot fully explain the properties of tills in Maritime Canada. A succession of local ice caps, called the Appalachian Ice Complex, developed during the last glaciation and were drained by ice streams into the submarine channels bordering the region. The migration of these centres produced areas with widely differing flow patterns, landform assemblages and deposits. Early regional phases of ice flow were characterized by wide, rapidly-flowing ice-streams that formed thick exotic, silty tills. In later phases, ice divides developed over highland areas underlain by metamorphic and igneous rocks, forming stony local tills. Terrain zones characterized by distinct transport histories and depositional sequences were produced by the interplay and migration of regional ice sheets and local ice caps. The interaction of local glaciers and previously deposited tills formed hybrid tills through two reworking processes: inheritance and overprinting. Inheritance is incorporation of till components and/or fabric into a younger till by erosion and entrainment of material from an older till. Overprinting is the injection or imprint of matrix, clasts or fabric on older tills by overriding ice. Glacial dispersal of rocks, minerals and trace elements in this complex glaciated terrain is controlled by the location of former ice divides. Simple unidirectional trains are preserved in relict terrains under divides. In ice marginal areas, reworking processes result in complex dispersal fans produced by smearing and widening of previously formed trains and fans. These dispersal fans can be modelled by vector addition of discrete flow events within each dispersal zone. A simple empirical model of glacier dispersal is presented using exponential decay and uptake algorithms, and incorporating the reworking of older till material.