scholarly journals Cambrian–Silurian stratigraphy of Børglum Elv, Peary Land, eastern North Greenland

1977 ◽  
Vol 82 ◽  
pp. 1-48
Author(s):  
R.L Christie ◽  
J.S Peel
Keyword(s):  
Black Shale ◽  
Lower Cambrian ◽  
Late Ordovician ◽  
Dolomitic Limestone ◽  
Carbonate Mounds ◽  
Middle Ordovician ◽  
Clastic Rocks ◽  
Shale Formation ◽  
Lower Palaeozoic ◽  
North Greenland

A sequence of Lower Palaeozoic carbonate and clastic rocks is described from Børglum Elv, Peary Land, eastem North Greenland, and briefly compared to Lower Palaeozoic sections elsewhere in Greenland and in Spitsbergen. Lower Cambrian clastic rocks of the Buen Formation are followed by dolomite of the Lower Cambrian Brønlund Fjord Formation (125 m). Succeeding dolomite and dolomitic limestone of the Wandel Valley Formation (320 m) of Early to Middle Ordovician age are overlain by limestone of the Børglum River Formation (430 m) of Middle to Late Ordovician age. Un-narned Early Silurian dolomite and limestone formations (150 m and 320 m respectively) are followed by an un.narned Middle Silurian black shale formation (c. 100 m) and at least 800 m of a late Middle Silurian and younger un-named flysch formation. Carbonate mounds, originating in the highest beds of the un-named Silurian limestone formation, occupy stratigraphic levels through the overlying black shale formation and into the flysch formation.

scholarly journals Biostratigraphic reconnaissance in the Lower Palaeozoic of western North Greenland

1984 ◽  
Vol 121 ◽  
pp. 19-51
Author(s):  
P.R Dawes ◽  
J.S Peel
Keyword(s):  
Fault Zone ◽  
Deep Water ◽  
Lower Cambrian ◽  
The South ◽  
The West ◽  
Middle Ordovician ◽  
Water Trough ◽  
Lower Palaeozoic ◽  
North Greenland ◽  
Land Region

Sections and fossil collections resulting from activities under Operation Grant Land 1965-66 in the Hall Land - Wulff Land region of western North Greenland are briefly discussed. Strongly tectonised Lower Cambrian to Silurian strata are present in the northern part of the area in association with the Wulff Land anticline and the Nyeboe Land fault zone. To the south, platform and deep-water trough sequences are generally little disturbed and strata range in age from Middle Ordovician to Late Silurian (Pridoli). Most stratigraphic units can be accommodated in stratigraphic schemes established in Washington Land, to the west, or Peary Land, to the east.

Late Ordovician carbonate mounds from North Greenland: a peri-Laurentian dimension to the Boda Event?

GFF ◽  
2014 ◽  
Vol 136 (1) ◽  
pp. 95-99 ◽  
Author(s):  
David Alexander Taylor Harper ◽  
Jisuo Jin ◽  
Christian Mac Ørum Rasmussen
Keyword(s):  
Late Ordovician ◽  
Carbonate Mounds ◽  
North Greenland

A new Late OrdovicianHirnantiabrachiopod Fauna from NW Turkey, its biostratigraphical relationships and palaeogeographical setting

2012 ◽  
Vol 150 (3) ◽  
pp. 479-496 ◽  
Author(s):  
CAZIBE SAYAR ◽  
L. ROBIN M. COCKS
Keyword(s):  
Global Warming ◽  
Late Ordovician ◽  
Middle Ordovician ◽  
Nw Turkey ◽  
Southern Turkey ◽  
Lower Palaeozoic ◽  
The Mediterranean ◽  
Brachiopod Fauna

AbstractLate Ordovician fossils, including the distinctiveHirnantiabrachiopod Fauna, have been found in Lower Palaeozoic successions in Istanbul and Bolu (Yığılca), western Pontides, NW Turkey. The Middle Ordovician (Sandbian) faunas belong to the cooler-water Mediterranean Province, and they are followed by Katian brachiopods includingSulevorthis,Nicolella,Hesperorthis,Glyptorthis,SaukrodictyaandKullervoand ostracods such asPiretella,EochilinaandKlimphores, which represent deposition in warmer waters; however, the Mediterranean Province usually cooler-water brachiopodsDraboviaandLeptestiinaalso occur. The Pendik Formation includes thin bryozoan-rich limestones which probably represent the Boda Global Warming Event. The overlying turbidites contain aHirnantiaFauna, developed within a brachiopod–diplograptid association. Above them there are characteristic Llandovery (Rhuddanian–Aeronian) brachiopods, such asLeangella,Eoplectodonta,StricklandiaandHindellawith the coralsHalysites,PaleofavositesandStreptelasma. In the Bolu area, Katian brachiopods such asMcewanella,Dalmanella,Glyptorthis,Christiania,Oligorhynchia,Nicolella,HowellitesandDrabovinellaalso occur, but there the overlyingHirnantiaFauna is developed within aHirnantia–Mucronaspisassociation. The fauna and sediments indicate that the western Pontides were not very cold during the latest Ordovician. Despite Turkey being placed in higher latitudes by previous authors, it seems more probable that the Pontides were at somewhat lower palaeolatitudes, perhaps at about 40°S in those times; however, the precise palaeogeographical position of the terrane remains uncertain: there are no Hirnantian glaciogenic rocks there, such as are found in the Taurides of southern Turkey.

Principal characteristics of the Upper Silesian Block and Małopolska Block border zone (southern Poland)

1997 ◽  
Vol 134 (5) ◽  
pp. 669-677 ◽  
Author(s):  
ZBIGNIEW BUŁA ◽  
MONIKA JACHOWICZ ◽  
JERZY ŻABA
Keyword(s):  
Lower Cambrian ◽  
Border Zone ◽  
Lateral Part ◽  
Tectonic Zone ◽  
Principal Characteristics ◽  
East European ◽  
Lower Silurian ◽  
Clastic Rocks ◽  
Lower Palaeozoic ◽  
Małopolska Block

The Upper Silesian and Małopolska blocks are situated near the southwestern boundary of the East European Platform within the Trans-European Suture Zone. The Lower Palaeozoic lithologies of the blocks reveal different stratigraphic and diastrophic development. In the Upper Silesian Block, unmetamorphosed and gently folded Lower Cambrian to Ordovician sedimentary rocks rest on a Cadomian basement. The Lower Cambrian is represented by an older (sub-Holmia) Borzęta Formation and a younger (Holmia) Goczałkowice Formation. The thickness of the Cambrian lithologies increases from the southwest towards the lateral part of the block. In the Małopolska Block Palaeozoic and Precambrian lithologies are represented by regionally metamorphosed and intensely folded Lower Cambrian–Vendian clastic rocks which are unconformably overlain by Ordovician–Lower Silurian carbonates and Upper Silurian clastic rocks. The crystalline basement of the Małopolska Block has yet to be recognized. The Lower Palaeozoic sediments of both blocks are overlain by Devonian and Carboniferous rocks. The blocks are in direct contact along a narrow tectonic zone, a part of the largely concealed Hamburg–Kraków fault zone, in which tectonic evolution has taken place spasmodically with strike-slip movements predominating.

scholarly journals Lower Palaeozoic Franklinian Basin of North Greenland

1991 ◽  
Vol 160 ◽  
pp. 71-139
Author(s):  
A.K Higgins ◽  
J.R Ineson ◽  
J.S Peel ◽  
F Surlyk ◽  
M Sønderholm
Keyword(s):  
Carbonate Platform ◽  
Early Carboniferous ◽  
Normal Faults ◽  
Early Cambrian ◽  
Middle Ordovician ◽  
The North ◽  
Water Trough ◽  
Lower Palaeozoic ◽  
Orogenic Uplift ◽  
North Greenland

The Franklinian Basin extends from the Canadian Arctic Islands to eastern North Greenland, a distance of approximately 2000 km. In the North Greenland segment about 8 km of Lower Palaeozoic strata are well exposed and permit the recognition of 7 stages in the evolution of the basin. With the exception of the first stage of basin initiation, which occurred dose to the Precambrian-Cambrian boundary, each stage is differentiated into a southern shelf and slope, and a northern deep-water trough. The position of the boundary between the shelf and trough was probably controlled by deep seated normal faults and, with time, the basin expanded southwards leading to a final foundering of the shelf areas during the Silurian. The 7 stages in the evolution of the Franklinian Basin in North Greenland are: 1, Late Proterozoic? - Early Cambrian shelf (basin initiation); 2, Early Cambrian carbonate platform and incipient trough; 3, Early Cambrian siliciclastic shelf and turbidite trough; 4, Late Early Cambrian - Middle Ordovician carbonate shelf and starved trough; 5, Middle Ordovician - Early Silurian aggradational carbonate platform, starved slope and trough; 6, Early Silurian ramp and rimmed shelf, and turbidite trough; 7, Early - Late Silurian drowning of the platform. Basin evolution and sedimentation patterns in the eastem part of the Franklinian Basin were strongly influenced by the dosure of the lapetus Ocean and Caledonian orogenic uplift in eastern North Greenland. The Franklinian Basin in North Greenland was finally closed in Devonian - Early Carboniferous times, resulting in strong deformation of the northern part of the Franklinian trough sequence during the Ellesmerian Orogeny.

scholarly journals The Precambrian, Eocambrian and early Palaeozoic stratigraphy of the Jørgen Brønlund Fjord area, Peary Land, North Greenland

1971 ◽  
Vol 96 ◽  
pp. 1-42
Author(s):  
H.F Jepsen
Keyword(s):  
Lower Cambrian ◽  
Field Work ◽  
Sedimentary Sequence ◽  
Long Period ◽  
Composite Section ◽  
Lower Palaeozoic ◽  
Early Palaeozoic ◽  
North Greenland

The sedimentary sequence in the platform area (approx. 2500 km2) around Jørgen Brønlund Fjord, North Greenland, has been mapped, and sections through the Precambrian, Eocambrian and Lower Palaeozoic sequence are described. After a summary of the previous geological field work carried out in the area, a lithological description of a composite section through the sequence below the Lower Cambrian Brønlund Fjord Dolomite (Troelsen, 1949) is given. This sequence, which is about 1000 m thick, is divided into four formations – in ascending order: Inuiteq Sø Formation (sandstone), Morænesø Formation (tillite and dolomite), Portfjeld Formation (dolomite) and Buen Formation (sandstone and shale). The first three named formations are separated by two unconformities both representing a long period of erosion. The strata are cut by two dolerite sequences, of which the older (the Midsommersø dolerites) is of Precambrian age and intrudes only the Inuiteq Sø Formation. Intrusions of the younger sequence penetrate all the strata in the Jørgen Brønlund Fjord area and are regarded as post-Palaeozoic. In the last section the chronostratigraphy and the correlation with neighbouring areas are discussed. Special attention is given to the two newly discovered erosional unconformities, which together with the tillite occurrence and the radiometric K/Ar dated Midsommersø dolerites, throw new light on the stratigraphy of North Greenland.

scholarly journals Cambrian and Ordovician geology of Warming Land and southern Wulff Land, central North Greenland

1980 ◽  
Vol 101 ◽  
pp. 55-60
Author(s):  
J.S Peel
Keyword(s):  
Lower Cambrian ◽  
The West ◽  
Middle Ordovician ◽  
Early Ordovician ◽  
Late Cambrian ◽  
Clastic Sediments ◽  
Middle And Late Cambrian ◽  
North Greenland

Fossiliferous Lower Cambrian clastic sediments in Warming Land and southern Wulff Land, central North Greenland, are overlain by about 600 m of mainly carbonates which have yielded Middle and Late Cambrian trilobites. About 560 m of succeeding carbonates and subsidiary clastics are tentatively correlated with sequences in Washington Land, to the west, which range in age from Early Ordovician to early Middle Ordovician. The Ordovician sequence is completed by limestones of the Morris Bugt Group, also originally defined from Washington Land.

Nucularcidae: a new family of palaeotaxodont Ordovician pelecypods (Mollusca) from North America and Australia

2007 ◽  
Vol 44 (10) ◽  
pp. 1479-1501 ◽  
Author(s):  
John Pojeta Jr. ◽  
Christopher A Stott
Keyword(s):  
New Species ◽  
Type Species ◽  
New Genus ◽  
Late Ordovician ◽  
Eastern Canada ◽  
Middle Ordovician ◽  
New Family ◽  
Central Australia ◽  
Northeastern Usa ◽  
Subjective Synonym

The new Ordovician palaeotaxodont family Nucularcidae and the new genus Nucularca are described. Included in Nucularca are four previously described species that have taxodont dentition: N. cingulata (Ulrich) (the type species), N. pectunculoides (Hall), N. lorrainensis (Foerste), and N. gorensis (Foerste). All four species are of Late Ordovician (Cincinnatian Katian) age and occur in eastern Canada and the northeastern USA. Ctenodonta borealis Foerste is regarded as a subjective synonym of Nucularca lorrainensis. No new species names are proposed. The Nucularcidae includes the genera Nucularca and Sthenodonta Pojeta and Gilbert-Tomlinson (1977). Sthenodonta occurs in central Australia in rocks of Middle Ordovician (Darriwilian) age. The 12 family group names previously proposed for Ordovician palaeotaxodonts having taxodont dentition are reviewed and evaluated in the Appendix.

Articulated halkieriids from the Lower Cambrian of North Greenland and their role in early protostome evolution

1995 ◽  
Vol 347 (1321) ◽  
pp. 305-358 ◽  
Keyword(s):  
Body Size ◽  
Molecular Biology ◽  
Lower Cambrian ◽  
Burgess Shale ◽  
Internal Anatomy ◽  
Middle Cambrian ◽  
Functional Consequence ◽  
Primitive State ◽  
North Greenland

Articulated halkieriids of Halkieria evangelista sp. nov. are described from the Sirius Passet fauna in the Lower Cambrian Buen Formation of Peary Land, North Greenland. Three zones of sclerites are recognizable: obliquely inclined rows of dorsal palmates, quincuncially inserted lateral cultrates and imbricated bundles of ventro-lateral siculates. In addition there is a prominent shell at both ends, each with radial ornamentation. Both sclerites and shells were probably calcareous, but increase in body size led to insertion of additional sclerites but marginal accretion of the shells. The ventral sole was soft and, in life, presumably muscular. Recognizable features of internal anatomy include a gut trace and possible musculature, inferred from imprints on the interior of the anterior shell. Halkieriids are closely related to the Middle Cambrian Wixaxia , best known from the Burgess Shale: this clade appears to have played an important role in early protostome evolution. From an animal fairly closely related to Wixaxia arose the polychaete annelids; the bundles of siculate sclerites prefigure the neurochaetae whereas the dorsal notochaetae derive from the palmates. Wixaxia appears to have a relic shell and a similar structure in the sternaspid polychaetes may be an evolutionary remnant. The primitive state in extant polychaetes is best expressed in groups such as chrysopetalids, aphroditaceans and amphinomids. The homology between polychaete chaetae and the mantle setae of brachiopods is one line of evidence to suggest that the latter phylum arose from a juvenile halkieriid in which the posterior shell was first in juxtaposition to the anterior and rotated beneath it to provide the bivalved condition of an ancestral brachiopod. H. evangelista sp. nov. has shells which resemble those of a brachiopod; in particular the posterior one. From predecessors of the halkieriids known as siphogonuchitids it is possible that both chitons (polyplacophorans) and conchiferan molluscs arose. The hypothesis of halkieriids and their relatives having a key role in annelid—brachiopod—mollusc evolution is in accord with some earlier proposals and recent evidence from molecular biology. It casts doubt, however, on a number of favoured concepts including the primitive annelid being oligochaetoid and a burrower, the brachiopods being deuterostomes and the coelom being an archaic feature of metazoans. Rather, the annelid coelom arose as a functional consequence of the transition from a creeping halkieriid to a polychaete with stepping parapodial locomotion.

scholarly journals Notes on some Lower Palaeozoic to Tertiary faunas from eastern North Greenland

1974 ◽  
Vol 65 ◽  
pp. 18-23
Author(s):  
J.S Peel ◽  
P.R Dawes ◽  
J.C Troelsen
Keyword(s):  
Field Work ◽  
The South ◽  
Initial Field ◽  
North East ◽  
The North ◽  
Lower Palaeozoic ◽  
North Greenland

The north-east 'corner' of Greenland is geologically probably the least known region in North Greenland. Various expeditions have visited the coastal parts but geological detail, particularly faunal information, has remained surprisingly scarce. Initial field work by Koch (1923, 1925) and Troelsen (1949a, b, 1950) showed that a Precambrian to Silurian section - unfolded in the south, folded in the north - was unconformably overlain by a Carboniferous to Tertiary section, now referred to as the Wandel Sea basin (Dawes & Soper, 1973).

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