Download or read book The Lower and Middle Ordovician Platform Carbonates of the Minigan Islands Quebec written by Andre Desrochers and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An undeformed sequence of Lower and Middle Ordovician shallow-water carbonates is exposed on the Mingan Islands located along the Quebec North Shore of the Gulf of St. Lawrence. This sequence comprises dolostones of the Romaine Formation and limestones of the Mingan Formation. The late Canadian to earliest Whiterockian Romaine Formation is subdivided into three formal members: Sauvage Member, Sainte-Genevieve Member and Grande Ile Member. The Chazyan Mingan Formation is subdivided into four formal members: Corbeau Member, Perroquet Member, Fantome Member and Grande Pointe Member. -- The Romaine Formation represents a shallowing-upward sequence comprising a thin basal assemblage of trangressive sandstones, a middle assemblage of subtidal carbonates and an upper assemblage of cyclic peritidal carbonates. Romaine sediments were pervasively dolomitized in shallow subsurface environments (possibly in mixing zones) before the end of post-Romaine karst erosion. -- The Mingan Formation is a complex environmental mosaic of peritidal and subtidal limestones with a basal trangressive sandstone overlain by tidal flat siliciclastics. Sedimentation changed abruptly with deposition of peritidal and subtidal limestones prior to a period of subaerial exposure resulting in the formation of a karst surface with substantial relief. Resubmergence of this irregular rocky coastline with scattered beachrocks, resulted in a complex facies mosiac with sand shoals forming in underlying paleokarst depressions as tidal deltas 1-10 km wide. -- Three superimposed calcarenite cycles are present in the Mingan sand shoal complex. These sand shoals were periodically exposed and subject to karstification in response to minor fluctuations in sea level. The amount of sea level fall was minor and deeper inter-shoal areas were not affected by subaerial exposure but were sites of more restricted deposition. -- Mingan reef limestones are of three types: biostromes, bioherms which grew in tranquil settings, and bioherm complexes which grew under more turbulent conditions. Reef organisms include lithistid sponges, bryozoans, tabulate corals and solenoporacean algae which occur in a variety of different biotic assemblages. These builders are in part inherited from older bioherms and in part newly involved taxa. Mingan bioherms are typically small mound-shaped structures composed of abundant skeletons and rich in lime mud. Stromatoporoids are conspicuously absent as builders in the Mingan bioherms in contrast to the classic Chazy reefs of Vermont and New York. -- Three different types of paleokarst surfaces are present in the Mingan sequence: 1) an extensive karst plain, represented by the post-Romaine unconformity; 2) an irregular karst, represented by the intra-Mingan paleokarst and 3) local karst surfaces capping calcarenite cycles. -- Alteration of the Mingan limestones resulted from three distinct phases of diagenesis: marine, near-surface and deep burial; near-surface is the most important, especially beneath subaerial exposure surfaces. Vadose cement is not present in spite of extensive evidence of subaerial exposure. Crystal debris, similar to "vadose silt" and formed by the internal erosion of contemporaneous phreatic cements, was subsequently deposited as geopetal internal sediment.
Download or read book The Lower and Middle Ordovician Platform Carbonates of the Mingan Islands Quebec written by Andre Desrochers and published by . This book was released on 1985 with total page 908 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Great American Carbonate Bank written by James Derby and published by AAPG. This book was released on 2013-01-20 with total page 1229 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hardcover plus DVD
Download or read book Regional Deposition and Diagenesis of Lower Ordovician Epeiric Platform Carbonates written by Patricia Brennan-Alpert and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sedimentology and Paleontology of the Early Ordovician Through Early Silurian Shallow Water Carbonates of the Mingan Islands National Park and Anticosti Island Qu bec written by André Desrochers and published by . This book was released on 1998 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Early and Early Middle Ordovician Continental Slope Deposition written by Ed Landing and published by Albany, NY : University of the State of New York, New York State Museum/Geological Survey, the State Education Department. This book was released on 1992 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Regional Deposition and Diagenesis of Lower Ordovician Epeiric Platform Carbonates written by Patricia Brennan-Alpert and published by . This book was released on 2001 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Regional Deposition and Diagenesis of Lower Ordovician Epeiric Platform Carbonates microform the Romaine Formation Mingan Archipelago and Subsurface Anticosti Island Eastern Quebec written by Patricia Brennan-Alpert and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2001 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cloridorme Formation Middle Ordovician Flysch written by Paul Enos and published by Geological Society of America. This book was released on 1969 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paleozoic sequence stratigraphy views from the North American Craton written by Brian J. Witzke and published by Geological Society of America. This book was released on 1996-01-01 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy and Sedimentology of Middle Cambrian to Lower Ordovician Shallow Water Carbonate Rocks written by Rene Joseph Levesque and published by . This book was released on 1977 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Petroleum Abstracts written by and published by . This book was released on 1993 with total page 1752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paleoenvironments and Stratigraphy of the Middle Ordovician Carbonates in the Lower Mohawk Valley written by Ewa M. Newman and published by . This book was released on 1980 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy of the Lower to Lower Middle Ordovician St George Group Western Newfoundland written by Ian Knight and published by . This book was released on 1988 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The St. George Group is an approximately 500-m-thick sequence of carbonate rock in western Newfoundland. This report defines and explains the stratigraphy of these Lower Ordovician rocks, including the regional geology and geography, their age, and a review of work already done in the area.
Download or read book Geological Map 22 H 12E F and Notes on the Ordovician and Silurian Litho and Biostratigraphy Anticosti Island Quebec written by Thomas E. Bolton and published by . This book was released on 1972 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: The six formations detailed on the preliminary geological map of Anticosti Island, Quebec, represent an uninterrupted sequence of nearly flat-lying rocks of Upper Ordovician to Middle Silurian ages. The Upper Ordovician strata, divisible into two formations, Vaureal and Ellis Bay, are persistent, alternating calcareous and argillaceous units, each bearing distinct marine faunal assemblages. These rocks occupy the northwestern one-third of the island. The succeeding Lower and Middle Silurian strata of the Becscie, Gun River and Jupiter Formations are more variable lithological units, the uppermost Chicotte Formation, occurring only along the southern coast of the island, being everywhere a massive, cronoidal limestone. These Silurian formations, of Llandoverian and early Wenlockian ages (Alexandrian and early Niagaran), are highly fossiliferous and divisible into several tentative faunal units. Characteristic fossils from each of the six formations are illustrated in a preliminary fashion and grouped by formation.
Download or read book Middle and Upper Cambrian and Lower Ordovician Acritarchs from Random Island Eastern Newfoundland written by F. Martin and published by Geological Survey of Canada. This book was released on 1981 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sedimentation History and Provenance of the Middle Ordovician Les Trois Ruisseau Member of the Deslandes Formation written by Wayne V. Bloechl and published by . This book was released on 1996 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
