Salterella rugosa (Early Cambrian: Agmata) on Nordaustlandet and Spitsbergen, Svalbard

Lauritzen, Ørnulf; Yochelson, Ellis L.

doi:10.1111/j.1751-8369.1982.tb00469.x

Cited by 11 publications

(3 citation statements)

References 5 publications

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“…These subglacial sediments may originate from glacial erosion of the underlying bedrock and/or marine sedimentation during periods when the glacier extent over the seabed was considerably smaller then today (e.g. the Holocene Optimum $9 to 5 ka BP (Hjort and others, 1995;Blake, 2006) (Lauritzen and Ohta, 1984). Information on bedrock type for presently glacierized areas is not available, but it is noteworthy that the known surge-type basins, Etonbreen and Bråsvellbreen, are located adjacent to the soft, easily erodible bedrock types.…”

Section: Basal Propertiesmentioning

confidence: 99%

Permanent fast flow versus cyclic surge behaviour: numerical simulations of the Austfonna ice cap, Svalbard

Dunse¹,

Greve

Schuler³

et al. 2011

J. Glaciol.

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ABSTRACT. A large part of the ice flux within ice caps occurs through spatially limited fast-flowing units. Some of them permanently maintain fast flow, whereas others operate in an oscillatory mode, characterized by short-lived active phases followed by long quiescent phases. This surge-type behaviour results from intrinsic rather than external factors, thus complicating estimates of glacier response to climate change. Here we present numerical model results from Austfonna, an ice cap on Svalbard that comprises several surge-type basins. Previous studies have suggested a thermally controlled soft-bed surge mechanism for Svalbard. We systematically change the parameters that govern the nature of basal motion and thereby control the transition between permanent and oscillatory fast flow. Surge-type behaviour is realized by a relatively abrupt onset of basal sliding when basal temperatures approach the pressure-melting point and enhanced sliding of marine grounded ice. Irrespective of the dynamic regime, the absence of considerable volumes of temperate ice, both in the observed and simulated ice cap, indicates that fast flow is accomplished by basal motion over a temperate bed. Given an idealized present-day climate, the equilibrium ice-cap size varies significantly, depending on the chosen parameters.

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Section: Basal Propertiesmentioning

confidence: 99%

Permanent fast flow versus cyclic surge behaviour: numerical simulations of the Austfonna ice cap, Svalbard

Dunse¹,

Greve

Schuler³

et al. 2011

J. Glaciol.

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“…2.1, locality 3) compares closely with North-East Greenland (Harland, 1997; Stouge et al, 2011). From this latter area, Salterella Billings, 1861 was described by Lauritzen and Yochelson (1982), Knoll and Swett (1987), Dunkley Jones (2007), and Stouge et al (2011). It is widely distributed in Greenland (Peel and Yochelson, 1982; Peel, 2017b), but has not been recognized in the outer shelf setting at Navarana Fjord.…”

Section: Biostratigraphy and Faunal Comparisonsmentioning

confidence: 97%

An outer shelf shelly fauna from Cambrian Series 2 (Stage 4) of North Greenland (Laurentia)

Peel

2021

J. Paleontol.

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An assemblage of 50 species of small shelly fossils is described from Cambrian Series 2 (Stage 4) strata in North Greenland, the present day northernmost part of the paleocontinent of Laurentia. The fossils are derived from the basal member of the Aftenstjernesø Formation at Navarana Fjord, northern Lauge Koch Land, a condensed unit that accumulated in a sediment-starved outer ramp setting in the transarctic Franklinian Basin, on the Innuitian margin of Laurentia. Most other small shelly fossil assemblages of similar age and composition from North America are described from the Iapetan margin of Laurentia, from North-East Greenland south to Pennsylvania. Trilobites are uncommon, but include Serrodiscus. The Australian bradoriid Spinospitella is represented by a complete shield. Obolella crassa is the only common brachiopod. Hyoliths, including Cassitella, Conotheca, Neogloborilus, and Triplicatella, are abundant and diverse, but most are represented just by opercula. Sclerites interpreted as stem-group aculiferans (sachitids) are conspicuous, including Qaleruaqia, the oldest described paleoloricate, Ocruranus?, Inughuitoconus n. gen., and Hippopharangites. Helcionelloid mollusks are diverse, but not common; they are associated with numerous specimens of the bivalve Pojetaia runnegari. The fauna compares best with that of the upper Bastion Formation of North-East Greenland, the Forteau Formation of western Newfoundland, and the Browns Pond Formation of New York, but several taxa have a world-wide distribution. Many specimens are encrusted with crystals of authigenic albite. New species: Anabarella? navaranae, Stenotheca? higginsi, Figurina? polaris, Hippopharangites groenlandicus, Inughuitoconus borealis, and Ocruranus? kangerluk.UUID: http://zoobank.org/160a17b1-3166-4fcf-9849-a3cabd1e04a3

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“…The introduction of migmatite and granitic rock clasts in the upper part of the till sequence, together with the decreasing grain size, indicates a subsequent deposition of more fartransported debris. The provenance of the migmatites and granites is probably eastern Spitsbergen or Nordaustlandet (Hjelle & Lauritzen 1982;Lauritzen & Ohta 1984), more than 150 km north of Edge~ya. The fabric analyses and clast lithologies thus indicate that at least the upper part of the unit was deposited by a glacier moving out of Visdalen in a westerly direction towards Storfjorden, and that this glacier was not a local icecap over E d g e~y a with topography-controlled outlet glaciers.…”

Section: Unit II Glacial Erosion and Till Depositionmentioning

confidence: 99%

Late Weichselian to early Holocene sedimentation in a steep fjord/valley setting, Visdalen, Edgeøya, eastern Svalbard: glacial deposits, alluvial/colluvial-fan deltas and spit-platforms

Möller

Stubdrup²,

Kronborg³

1995

Polar Research

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The Visdalen valley, situated at the northwestern corner of Edge~ya, was investigated with respect to lithostratigraphy and depositional environments of the Quaternary sediments. Eight major lithostratigrdphic units are recognised of which seven were deposited during the Late Weichselian to early Holocene glaciation, deglaciation and the subsequent emergence of the area. and one unit deposited prior the last glaciation. Till deposition from a west-Rowing glacier was followed by glaciomarine and later marine deposition of fine-grained sediments. Coarse-grained colluvial and alluvial-fan deltas were deposited along the mountainsides in the Visdalen palaeo-bay, and distal sediment gravity-flow deposits from these deltas were interbedded with the glaciomarine-marine sediments. A spit-platform (riegel) was built up across the Visdalen bay contemporaneously with the alluvial fan-deltas. Its formation was time-transgressive, with its highest part in the south close to the marine limit at 85 m a s.1. and its lowest part in the north at caThe sediment source was alluvial and colluvial debris. which was entrained by longshore currents along the more exposed coast south of Visdalen and transported northwards to the final place of deposition. The bulk part of the riegel ridge is composed of progradational successions of steep foresets dipping towards NW. N and NE, and clearly rejects an earlier ice-contact model. Datings suggest that the fan-delta deposition and the riegel formation ended before 9,000 BP. A meltwater-fed lagoon with a highest level at >50m a.s.1. was formed behind the riegel ridge in which. according to varve counting. glaciolacustrine sedimentation lasted more than 250 years and occurred within the time span 9.00GR.500 BP. Gradual uplift of the area resulted id drainage of the glaciolacustrine lagoon. Beachface processes and fluvial down-cutting took place during the emergence of the area.Per Miiller. Department of Quaternary Geology, Lund University. Soloegatan 13. ,9223 62 Llord. Sweden.

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Salterella rugosa (Early Cambrian: Agmata) on Nordaustlandet and Spitsbergen, Svalbard

Cited by 11 publications

References 5 publications

Permanent fast flow versus cyclic surge behaviour: numerical simulations of the Austfonna ice cap, Svalbard

Permanent fast flow versus cyclic surge behaviour: numerical simulations of the Austfonna ice cap, Svalbard

An outer shelf shelly fauna from Cambrian Series 2 (Stage 4) of North Greenland (Laurentia)

Late Weichselian to early Holocene sedimentation in a steep fjord/valley setting, Visdalen, Edgeøya, eastern Svalbard: glacial deposits, alluvial/colluvial-fan deltas and spit-platforms

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