Paleoecologic, temporal, and spatial analysis of early Silurian Reefs of the Chicotte Formation, Anticosti Island, Quebec, Canada

Brunton, Frank R.; Copper, Paul

doi:10.1007/bf02536933

Cited by 26 publications

(17 citation statements)

References 53 publications

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“…Meter-scale stromatoporoid-coral bioherms composed of laminar to low domical stromatoporoids, tabulate corals, colonial rugose corals, and varying numbers of bryozoans have been described by Brunton and Copper (1994) and occur throughout. Paleo-sea stacks and shallow paleo-sea cliffs ( Fig.…”

Section: Middle Membermentioning

confidence: 99%

“…By then Telychian global diversity of benthic communities had returned to or exceeded pre-Hirnantian levels. The Chicotte Formation, for example, contains coral-stromatoporoid reefs (Brunton and Copper 1994).…”

Section: Paleoclimate and Paleoatmospherementioning

confidence: 99%

“…3, 4B) is a richly fossiliferous, upper Llandovery (Telychian), crinoidal and reefal limestone that crops out at the shoreline and in river valleys along the south-central side of the Island (Brunton and Copper 1994;Desrochers 2006). Exposures of the , 80-m-thick, gently southwest-dipping strata (Fig.…”

Section: Introductionmentioning

confidence: 98%

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Polygenetic (Polyphase) Karsted Hardground Omission Surfaces In Lower Silurian Neritic Limestones: Anticosti Island, Eastern Canada

James¹,

Desrochers²,

Kyser³

2015

Journal of Sedimentary Research

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Exquisitely preserved and well-exposed rocky paleoshoreline omission surfaces in Lower Silurian Chicotte Formation limestones on Anticosti Island, Québec, are interpreted to be the product of combined marine and meteoric diagenesis. The different omission features include: 1) planar erosional bedding tops, 2) scalloped erosional surfaces, 3) knobs, ridges, and swales at bedding contacts, and 4) paleoscarps. An interpretation is proposed that relates specific styles of omission surface to different diagenetic-depositional processes that acted in separate terrestrial-peritidal-shallow neritic zones. Such processes were linked to fluctuations in relative sea level with specific zones of diagenesis such as: 1) karst corrosion, 2) peritidal-shallow subtidal erosion, 3) subtidal seawater flushing and cementation, and 4) shallow subtidal deposition. Most surfaces are interpreted to have been the result of initial extensive shallow-water synsedimentary lithification forming hardgrounds that were, as sea level fell, planed by inner-neritic abrasion, successively altered by exposure and subaerial corrosion, only to be buried by sediments as sea level rose again. This succession was repeated several times, resulting in a suite of recurring polyphase omission surfaces through many meters of stratigraphic section. Synsedimentary cloudy marine cements are well preserved and are thus interpreted to have been calcitic originally. Aragonite components are rare and thought to have been dissolved just below the Silurian seafloor. Large mollusks that survived such seafloor removal were nonetheless leached and the resultant megamolds were filled with synsedimentary calcite cement. These Silurian inner-neritic-strandline omission surfaces are temporally unique. They are part of a suite of marine omission surfaces that are mostly found in early to middle Paleozoic neritic carbonate sedimentary rocks. These karsted hardgrounds formed during a calcite-sea time of elevated marine carbonate saturation and extensive precipitation of marine cement. The contemporaneous greenhouse atmosphere was supercharged with CO 2 , leading to profound surface karst under strongly acid rain. Younger peritidal omission surfaces, although potentially formed during aragonite-sea or calcite-sea times, would have been subject to very different terrestrial diagenetic process with lower atmospheric pCO 2 values but increasingly complex biogenic soils producing dissimilar alteration features.

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Section: Middle Membermentioning

confidence: 99%

Section: Paleoclimate and Paleoatmospherementioning

confidence: 99%

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Polygenetic (Polyphase) Karsted Hardground Omission Surfaces In Lower Silurian Neritic Limestones: Anticosti Island, Eastern Canada

James¹,

Desrochers²,

Kyser³

2015

Journal of Sedimentary Research

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“…1). The sequence was deposited in a subtropical to tropical setting, roughly 15°south of the paleoequator (Brunton and Copper, 1994). Minor siliciclastic sediments (e.g., fine quartz sand and silt) associated with sand-wave complexes are concentrated in late Rawtheyan and Hirnantian (Ordovician) strata primarily in the northeastern region of the island.…”

Section: Geological Settingmentioning

confidence: 99%

A New Endosymbiont in Late Ordovician Tabulate Corals from Anticosti Island, Eastern Canada

Tapanila

2003

Ichnos

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“…Most of the Llandovery strata were formed below the storm wave base, except the Chicotte Formation (Fm.) and other reefal or shallow-water units (Brunton & Copper 1994). The youngest rocks on Anticosti are represented by the 80-90 m thick Chicotte Fm.…”

Section: Introductionmentioning

confidence: 99%

New biostratigraphic and chemostratigraphic data from the Chicotte Formation (Llandovery, Anticosti Island, Laurentia) compared with the Viki core (Estonia, Baltica); pp. 159–169

Munnecke¹,

Männik²

2009

Estonian Journal of Earth Sciences

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Due to the lack of biostratigraphically useful graptolites in the crinoidal and reefal Chicotte Formation on Anticosti Island (Québec, Canada), the precise chronostratigraphic position of the formation is not known. New stable carbon isotope and conodont data and a comparison with the detailed conodont distribution and δ 13 C development in the Viki core (Estonia) suggest an early Telychian age (Pterospathodus eopennatus to P. a. angulatus zones) for at least the lower half of the formation. This interval is characterized by a small but distinct positive excursion in δ 13 C, with peak values of + 3.2‰ and + 2.8‰ VPDB in the lowermost 10-15 m of the Chicotte Formation on Anticosti and in the Viki core, respectively.

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Paleoecologic, temporal, and spatial analysis of early Silurian Reefs of the Chicotte Formation, Anticosti Island, Quebec, Canada

Cited by 26 publications

References 53 publications

Polygenetic (Polyphase) Karsted Hardground Omission Surfaces In Lower Silurian Neritic Limestones: Anticosti Island, Eastern Canada

Polygenetic (Polyphase) Karsted Hardground Omission Surfaces In Lower Silurian Neritic Limestones: Anticosti Island, Eastern Canada

A New Endosymbiont in Late Ordovician Tabulate Corals from Anticosti Island, Eastern Canada

New biostratigraphic and chemostratigraphic data from the Chicotte Formation (Llandovery, Anticosti Island, Laurentia) compared with the Viki core (Estonia, Baltica); pp. 159–169

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