Some Permian foraminifera from north-western England

Pattison, J.

doi:10.1017/s0016756800052006

Cited by 3 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Schuchert Dal Formation comprises marine sandstones (Bredehorn Member), which is locally calcareous (Depot Ò Member), and passes laterally into deeper-water mudrocks (Oksedal Member). Biota within the Schuchert Dal Formation forms a low diversity bryonoderm-like assemblage of bryozoans, brachiopods, ammonoids (Cyclolobus, Paramexicoceras), small foraminifers and solitary rugose corals (Birkelund and Perch-Nielsen, 1976;Surlyk et al, 1986;Pattison and Stemmerik, 1996).…”

Section: Zenith Of Pce: Lopingianmentioning

confidence: 99%

Growth and demise of Permian biogenic chert along northwest Pangea: evidence for end-Permian collapse of thermohaline circulation

Beauchamp

Baud

2002

Palaeogeography, Palaeoclimatology, Palaeoecology

272

132

View full text Add to dashboard Cite

The Permian Chert Event (PCE) was a 30 Ma long episode of unusual chert accumulation along the northwest margin of Pangea, and possibly worldwide. The onset of the PCE occurred at about the Sakmarian^Artinskian boundary in the Sverdrup Basin, Canadian Arctic, where it coincides with a maximum flooding event, the ending of high-frequency/high-amplitude shelf cyclicity, the onset of massive biogenic chert deposition in deep-water distal areas, and a long-term shift from warm-to cool-water carbonate sedimentation in shallow-water proximal areas. A similar and coeval shift is observed from the Barents Sea to the northwestern USA. A landward and southward expansion of silica factories occurred during the Middle and Late Permian at which time warm-water carbonate producers disappeared completely from the northwest margin of Pangea. Biotically impoverished and increasingly narrow cold-water carbonate factories (characterised by non-cemented bioclasts of sponges, bryozoans, echinoderms and brachiopods) were then progressively replaced by silica factories. By Late Permian time, little carbonate sediments accumulated in the Barents Sea and in the Sverdrup Basin, where the deep-to shallow-water sedimentary spectrum was occupied by siliceous sponge spicules. By that time, biogenic silica sedimentation was common throughout the world. Silica factories collapsed in the Late Permian, abruptly bringing the PCE to an end. In northwest Pangea, the end-Permian collapse of the PCE was associated with a major transgression and with a return to much warmer oceanic and continental climatic conditions. Chert deposition resumed in the distal oceanic areas during the early Middle Triassic (Anisian) after a 8^10 Ma interruption (Early Triassic Chert Gap). The conditions necessary for the onset, expansion and zenith of the PCE were provided by the thermohaline circulation of nutrient-rich cold waters along the northwestern and western margin of Pangea, and possibly throughout the world oceans. These conditions provided an efficient transportation mechanism that constantly replenished the supply of silica in the area, created a nutrient-and oxygen-rich environment favouring siliceous biogenic productivity, established cold sea-floor conditions, hindering silica dissolution, while increasing calcium carbonate solubility, and provided conditions adverse to organic and inorganic carbonate production. The northwest margin of Pangea was, for nearly 30 Ma, bathed by cold waters presumably derived from the seasonal melting of northern sea ice, the assumed engine for thermohaline circulation.This process started near the Sakmarian^Artinskian boundary, intensified throughout Middle and Late Permian time and ceased suddenly in latest Permian time. It led to oceanic conditions much colder than normally expected from the palaeolatitudes, and the influence of cold northerly-derived water was felt as far south southern Nevada. The demise of silica factories was caused by the rapid breakdown of these conditions and the establishment of a much warm...

show abstract

Section: Zenith Of Pce: Lopingianmentioning

confidence: 99%

Growth and demise of Permian biogenic chert along northwest Pangea: evidence for end-Permian collapse of thermohaline circulation

Beauchamp

Baud

2002

Palaeogeography, Palaeoclimatology, Palaeoecology

272

132

View full text Add to dashboard Cite

show abstract

Palynology of the Permian succession in the Hilton Borehole, Vale of Eden, Cumbria, UK

Warrington

2008

PYGS

View full text Add to dashboard Cite

Summary Palynomorphs have been recovered from a 108.28 m sequence, comprising the upper 4.32 m of the Penrith Sandstone, and the lower 103.96 m of the succeeding Eden Shales from the Hilton Plant Beds to the Belah Dolomite inclusive, cored in the 234.54 m-deep Hilton Borehole. This is currently the longest palynological record from a continuous section of Permian rocks in Britain. The palynomorphs are predominantly miospores though remains regarded as algal in origin also occur, mainly in the Hilton Plant Beds and the Belah Dolomite. The miospores are principally bisaccate pollen but some monosaccate pollen and a few pteridophytic spores are also present. The pollen Crucisaccites cf. variosulcatus and possibly the spore Proprisporites pococki are reported for the first time from Britain. The palynomorph assemblages from the Penrith Sandstone Formation are similar to those from the Hilton Plant Beds, supporting the view that a passage exists between these formations, and that their boundary is diachronous. The miospores indicate an age within the range Mid- to Late Permian but the magnetostratigraphy of correlative successions constrains this to the latest Mid-and Late Permian, and other palaeontological evidence favours an early Late Permian age.

show abstract

Ostracodes and Agglutinated Foraminifera as Indicators of Paleoenvironmental Change in an Early Carboniferous Brackish Bay, Atlantic Canada

Tibert¹,

Scott²

1999

PALAIOS

View full text Add to dashboard Cite

Some Permian foraminifera from north-western England

Cited by 3 publications

References 4 publications

Growth and demise of Permian biogenic chert along northwest Pangea: evidence for end-Permian collapse of thermohaline circulation

Growth and demise of Permian biogenic chert along northwest Pangea: evidence for end-Permian collapse of thermohaline circulation

Palynology of the Permian succession in the Hilton Borehole, Vale of Eden, Cumbria, UK

Ostracodes and Agglutinated Foraminifera as Indicators of Paleoenvironmental Change in an Early Carboniferous Brackish Bay, Atlantic Canada

Contact Info

Product

Resources

About