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Encrusting corals on a latest Ordovician to earliest Silurian rocky shore, southwest Hudson Bay, Manitoba, Canada

1987; Geological Society of America; Volume: 15; Issue: 1 Linguagem: Inglês

10.1130/0091-7613(1987)15 2.0.co;2

1943-2682

Markes E. Johnson, B. Gudveig Baarli,

Geological formations and processes

Research Article| January 01, 1987 Encrusting corals on a latest Ordovician to earliest Silurian rocky shore, southwest Hudson Bay, Manitoba, Canada Markes E. Johnson; Markes E. Johnson 1Department of Geology, Williams College, Williamstown, Massachusetts 01267 Search for other works by this author on: GSW Google Scholar B. Gudveig Baarli B. Gudveig Baarli 1Department of Geology, Williams College, Williamstown, Massachusetts 01267 Search for other works by this author on: GSW Google Scholar Author and Article Information Markes E. Johnson 1Department of Geology, Williams College, Williamstown, Massachusetts 01267 B. Gudveig Baarli 1Department of Geology, Williams College, Williamstown, Massachusetts 01267 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1987) 15 (1): 15–17. https://doi.org/10.1130/0091-7613(1987)15 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 Markes E. Johnson, B. Gudveig Baarli; Encrusting corals on a latest Ordovician to earliest Silurian rocky shore, southwest Hudson Bay, Manitoba, Canada. Geology 1987;; 15 (1): 15–17. doi: https://doi.org/10.1130/0091-7613(1987)15 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 Paleozoic tabulate corals are generally thought to have been free standing, a flattened disc-shaped to dome-shaped morphology providing a degree of stability in shallow-water, high-energy environments. The ability to encrust has previously been suggested by patterns of competitive overgrowth in certain species. Definite proof of encrustation by favositid corals is exhibited in an extraordinary example of an ancient rocky shore exposed for 350 m on Hudson Bay near Churchill, Manitoba. Carbonate strata attributed to the Upper Ordovician Port Nelson or Lower Silurian Severn River Formations locally transgress a massive Precambrian quartzite. An ancient shoreface is clearly marked by large, smoothly eroded boulders of the dark quartzite, commonly 2–10 m in diameter. The boulders are buried in coarse carbonate debris, but corals up to 20 cm in diameter are found cemented directly onto the surface of some boulders. Deep pitting of many boulders to a depth of 2–3 cm was contemporaneous and may have been promoted by unpreserved encrusters such as sponges or anemones. 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.