Bathymetric co-ordination of proximality trends and level-bottom communities; a case study from the Lower Silurian of Norway

Baarli, B. Gudveig

doi:10.2307/3514446

Cited by 26 publications

(25 citation statements)

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“…1), the gap is substantial and the area was first flooded in the late Rhuddanian (Coronograptus cyphus graptolite Biozone, see Electronic Supplement). This is in agreement with what Baarli (1988) found for the base of the Solvik Formation at Toverud in Sylling, approximately 4 km north of Olledalen. Topographically, this appears to have been a well exposed high that (Brenchley & Marshall, 1999).…”

Section: Relative Sea-level Changessupporting

confidence: 82%

Hirnantian (latest Ordovician) glaciations and their consequences for the Oslo Region, Norway, with a revised lithostratigraphy for the Langøyene Formation in the inner Oslofjorden area

Bockelie¹,

Baarli²,

Johnson³

2017

NJG

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During the Hirnantian Age (Late Ordovician) the Oslo Region was located in a subtropical setting with siliciclastic input and carbonate production. At that time the sea level fluctuated in the Oslo Region during three regressive-transgressive episodes, some of which involved subaerial exposure and coastal valley erosion. The last major sea-level drop resulted in the formation of a conspicuous network of incised valleys that were subsequently filled with sediment during the transgression in the latest part of the Hirnantian. The continuing transgressive event rapidly flooded the exposed land areas in the central Oslo-Asker district. The areas towards the west in mainland Asker and Sylling in the adjacent Modum district were first transgressed in the late Rhuddanian (Early Silurian). Primarily eustatic processes affected the area, but synsedimentary faulting may also have been in play. There are two distinct palaeovalley trends: one at Hovedøya in Oslo more or less NW-SE, with narrow valley sides, the other at Kalvøya and surrounding areas trending approximately NE-SW, with one valley more than 10 km long. There may have been more than one filling phase. Sediment fill of the last-formed incised valleys were mapped and correlated across a large area of the Oslo-Asker district. Four new members of the Langøyene Formation are proposed: the Skaueren, Høyerholmen, Pilodden and Kalvøya members. Strata of the lateral Langåra Formation began deposition during the Katian. The rest of the formation as well as the Skaueren and Høyerholmen members contain fossils belonging to the cold-water Kosov fauna of early to mid Hirnantian age. The Pilodden and fossiliferous parts of the Kalvøya members include a mix of cold-water Kosov and warm-water Edgewood faunas of late Hirnantian age. Detailed descriptions of many incised valley fill sections in Oslo and Asker are included to show the spectrum of the sediment fill composition.

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Section: Relative Sea-level Changessupporting

confidence: 82%

Hirnantian (latest Ordovician) glaciations and their consequences for the Oslo Region, Norway, with a revised lithostratigraphy for the Langøyene Formation in the inner Oslofjorden area

Bockelie¹,

Baarli²,

Johnson³

2017

NJG

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“…When describing and interpreting relative sealevel changes or eustasy, brachiopod assemblages have been used (e.g., Brett et al 1993). These have also been used to solve the relation between bathymetry and proximality trends (Baarli 1988). The upward decrease of depositional depth over the investigated interval can also be deduced from the fauna: the Pentamerusbearing micritic limestones somewhat below the base of the Fröjel Fm.…”

Section: Proximality Trends and Depthsmentioning

confidence: 99%

Stratigraphy, facies development, and depositional dynamics of the Late Wenlock Fröjel Formation, Gotland, Sweden

Calner¹

1999

GFF

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“…The shallower portions of the Rochester Shale were deposited in a muddy outer shelf, in perhaps 20±50 m of water, below normal wave base but strongly in¯uenced by episodic storms. The interbedded limestones within the Rochester Shale appear to be tempestites or storm deposits (Cant 1980;Aigner 1982Aigner , 1985DeCelles 1987;Baarli 1988;Duke 1990). Winnowed bryozoan-rich coquinites were generated as proximal deposits by the aggradation and winnowing of skeletal material in areas affected directly by storm waves.…”

Section: O V E R V I E W O F S T R a T I G R A P H Ymentioning

confidence: 99%

The Machaeridian Lepidocoleus Sarlei Clarke, 1896, from the Rochester Shale (Silurian) of New York State

Högström

Taylor

2001

Palaeontology

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ABSTRACT. Eight new specimens and the holotype of Lepidocoleus sarlei Clarke, 1896 from Lagersta Ètten deposits within the Rochester Shale (Silurian, Wenlock) of New York are described to elucidate the morphology, function and construction of the scleritome. The material exhibits an unusual type of dorsal hinge with a pronounced anteroposterior displacement between the two sides. Two specimens have an aberrant sclerite on the right side of segment eleven. One tightly enrolled specimen may demonstrate a method of defence with the stronger protected dorsal side oriented outwards. The presence of a segmented body plan is suggested, based on requirements for a functional spiral enrolment. Distinct anterior and posterior morphologies together with the pattern of rugae provide valuable help in reconstructing disarticulated lepidocoleids.

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Bathymetric co-ordination of proximality trends and level-bottom communities; a case study from the Lower Silurian of Norway

Cited by 26 publications

References 0 publications

Hirnantian (latest Ordovician) glaciations and their consequences for the Oslo Region, Norway, with a revised lithostratigraphy for the Langøyene Formation in the inner Oslofjorden area

Hirnantian (latest Ordovician) glaciations and their consequences for the Oslo Region, Norway, with a revised lithostratigraphy for the Langøyene Formation in the inner Oslofjorden area

Stratigraphy, facies development, and depositional dynamics of the Late Wenlock Fröjel Formation, Gotland, Sweden

The Machaeridian Lepidocoleus Sarlei Clarke, 1896, from the Rochester Shale (Silurian) of New York State

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