Hadimopanella from the Lower Cambrian of North Greenland: structure and affinities

New records of minute phosphatic sclerites of Hadimopanella are described from the Aftenstjernesø and Henson Gletscher Formations of western and central North Greenland in strata of Early Cambrian age. The new material illustrates the occurrence of mineralisation in the wall between individual sclerites and confirms earlier suggestions of the close relationship between Hadimopanella and Utahphospha. Both forms are compared with spicules produced by living and fossil compound ascidians of the genus Cystodytes and it is concluded that they may have been Early Palaeozoic representatives of the chordate Class Urochordata.

New Cambrian faunas from Peary Land, eastern North Greenland

10.34194/rapggu.v91.7618 ◽

1979 ◽

Vol 91 ◽

pp. 29-36

Author(s):

A.R Palmer ◽

J.S Peel

Keyword(s):

Lower Cambrian ◽

Early Cambrian ◽

Middle Cambrian ◽

Late Cambrian ◽

Middle And Late Cambrian ◽

Early, Middle and Late Cambrian faunas from Peary Land, eastern North Greenland, are briefly documented. The Early Cambrian faunas of the lower Brønlund Fjord Group are assigned to the Bonnia-Olenellus Zone, although olenellids from the underiying Buen Formation may be older. Strata from the upper Brønlund Fjord Group with Middle Cambrian faunas are seemingly separated from the Lower Cambrian by a discontinuity, without representation of early Middle Cambrian zones. Faunas from lower beds of the overlying Tavsens Iskappe Group span the Middle-Late Cambrian boundary. Upper beds ofthe Tavsens Iskappe Group are assigned to the Late Cambrian, but corroborative faunal evidence is not yet available.

Cambrian stratigraphy in Peary Land, eastern North Greenland

10.34194/rapggu.v99.7668 ◽

1980 ◽

Vol 99 ◽

pp. 33-42

Author(s):

J.R Ineson ◽

J.S Peel

Keyword(s):

Lower Cambrian ◽

Early Cambrian ◽

Similar Sequence ◽

The West ◽

Northern Side ◽

Cambrian strata in southern Peary Land occur in a continuous Outerop from J. P. Koch Fjord and Adams Gletscher in the west to lndependence Fjord in the eas! (fig. 15), forming a conspicuous rampart on the northern side of Wandal Dal. The Lower Cambrian sequence around Jørgen Brønlund Fjord has previously been described by TroeIsen (1949), Jepsen (1971) and Christie & Peel (1977), who recorded possible Cambrian dolomites of the Portfjeld Formation succeded by the clastic Buen Formation and the dolomitic Brønlund Fjord Formation, both of Early Cambrian age. Troelsen (1956) and Christie & Ineson (1979) have discussed a similar sequence which occurs near G.B. Schley Fjord in eastern Peary Land (fig. 1).

Spirellus and related helically coiled microfossils (cyanobacteria) from the Lower Cambrian of North Greenland

10.34194/rapggu.v137.8009 ◽

1988 ◽

Vol 137 ◽

pp. 5-32

Author(s):

J.S Peel

Keyword(s):

Lower Cambrian ◽

Cell Structure ◽

Early Cambrian ◽

Filamentous Cyanobacterium ◽

First Time ◽

Phosphatised helically coiled microfossils are described from the Portfjeld Formation of Early Cambrian age in southem Peary Land, central North Greenland. SpirelIus Jiang in Luo et al., 1982, originally described from the Meishucunian Stage of China, is recorded from Greenland and interpreted as a filamentous cyanobacterium showing variable degrees of mineralisation of the sheath. Jiangispirellus groenlandicus gen. et sp. nov. is described, based on helically coiled naked trichomes with preserved cell structure. Both genera are compared to Obruchevella Reitlinger, 1948 which is also reported from Greenland for the first time.

Acritarchs from the Buen Formation (Lower Cambrian), North Greenland

10.34194/rapggu.v137.8014 ◽

1988 ◽

Vol 137 ◽

pp. 54-54

Author(s):

G Vidal ◽

J.S Peel

Keyword(s):

Lower Cambrian ◽

Trace Fossils ◽

Early Cambrian ◽

Burgess Shale ◽

Middle Cambrian ◽

Siliciclastic Sediments ◽

Siliciclastic sediments of the Buen Formation of North Greenland yield the earliest Cambrian fossils known from North Greenland, with the exception of cyanobacteria described from dolomites of the underlying Portfjeld Formation (see Peel, this report). The fauna is dominated by olenellid and nevadiid trilobites indicating an Early Cambrian age (Poulsen, 1974; Blaker, this report) but hyolithids, bradoriids, sponges and other fossils also occur. Bergstrom & Peel (this report) described trace fossils from the Buen Formation. Of particular interest is the recent discovery of lightly skeletised arthropods comprising an assemblage similar to that of the Middle Cambrian Burgess shale of Canada (Conway Morris et al., 1987).

Early Cambrian Lingulellotreta (Lingulata, Brachiopoda) from South Kazakhstan (Malyi Karatau Range) and South China (Eastern Yunnan)

Journal of Paleontology ◽

10.1017/s0022336000040063 ◽

1997 ◽

Vol 71 (4) ◽

pp. 577-584 ◽

Cited By ~ 25

Author(s):

Lars E. Holmer ◽

Leonid E. Popov ◽

Svetlana P. Koneva ◽

Rong Jia-Yu

Keyword(s):

South China ◽

Lower Cambrian ◽

Early Cambrian ◽

Younger Age ◽

New Material ◽

Lowermost Part

“Lingulepis’ malongensis Rong from the upper part of the Lower Cambrian Chiungchussu Formation of Yunnan is referred to Lingulellotreta Koneva; L. malongensis (=Lingulellotreta ergalievi Koneva) is redescribed on the basis of new material from the Lower Cambrian of south Kazakhstan. It is the earliest known taxon of the Lingulellotretidae, which is unique within the Linguloidea in having an elongate pedicle foramen and internal pedicle tube. The occurrence of Lingulellotreta malongensis in south China is considered usually to be of Atdabanian age, but brachiopod based correlation with south Kazakhstan suggests that a possible Botomian or younger age, for both the upper part of Chiungchussu Formation in Yunnan and the lowermost part of Shabakty Group in the Malyi Karatau Range, is equally plausible.

Isoxys (Arthropoda) from the Early Cambrian Sirius Passet Lagerstätte, North Greenland

Journal of Paleontology ◽

10.1017/s0022336000038646 ◽

1996 ◽

Vol 70 (6) ◽

pp. 947-954 ◽

Cited By ~ 43

Author(s):

Mark Williams ◽

David J. Siveter ◽

John S. Peel

Keyword(s):

New Species ◽

North America ◽

Southwest China ◽

South Australia ◽

Early Cambrian ◽

Middle Cambrian ◽

New Material ◽

The marine offshore shelf mudstones of the Early Cambrian Buen Formation at Sirius Passet, North Greenland, contain a rich Konservat-Lagerstätte which includes abundant well-preserved material of the bivalved arthropod Isoxys volucris new species. The new material confirms Isoxys Walcott, 1890 as a component of the earliest arthropod faunas worldwide. Isoxys species are known from the Early Cambrian of Spain, Siberia, South Australia and Southwest China and also from the Early to Middle Cambrian of Laurentian North America. Isoxys occurs in the Redlichiid, Bigotinid and Olenellid trilobite faunal realms but is restricted to within tropical/subtropical regions, attesting to possible paleolatitudinal controls on its distribution. Isoxys resembles some phyllocarid and bradoriid arthropods but without knowledge of its soft-parts the affinity of the genus remains uncertain.

Functional morphology, evolution and systematics of Early Palaeozoic univalved molluscs

Bulletin Grønlands Geologiske Undersøgelse ◽

10.34194/bullggu.v161.6717 ◽

1991 ◽

Vol 161 ◽

pp. 1-116

Author(s):

J.S Peel

Keyword(s):

Functional Morphology ◽

Lower Cambrian ◽

Potential Role ◽

Morphology Evolution ◽

Early Palaeozoic ◽

Molluscan Evolution ◽

This bulletin contains two papers describing aspects of the functional morphology and systematics of Early Palaeozoic untorted molluscs and bellerophontacean gastropods. A brief discussion of the potential role in early molluscan evolution of articulated halkieriids recently discovered from the Lower Cambrian of North Greenland forms an introduction to the volume.

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

Bulletin Grønlands Geologiske Undersøgelse ◽

10.34194/bullggu.v96.6637 ◽

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 ◽

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.

A problematical trilobite from the Lower Cambrian of Freuchen Land, central North Greenland

10.34194/rapggu.v154.8165 ◽

1992 ◽

Vol 154 ◽

pp. 5-12

Author(s):

P.D Lane ◽

A.W.A Rushton

Keyword(s):

New Species ◽

Lower Cambrian ◽

Low Energy ◽

Early Cambrian ◽

Single Specimen ◽

North East ◽

A New Species ◽

A single specimen of a remarkable trilobite is described from the Early Cambrian Buen Formation of north-east Freuchen Land, central North Greenland. It is referred with doubt to Alacephalus Repina, 1960, as a new species A? davisi sp. nov. It possibly lacked eyes, which makes it one of, if not the, earliest non-agnostoid trilobite with this adaptation. Its thoracic segments have a unique morphology. In some respects the morphology resembles that of various trilobites adapted to low-energy benthic environments of low oxygenation; such trilobites tend to be widely distributed, and in agreement with this Alacephalus appears to be interprovincial.

A new genus of nevadiid trilobite from the Buen Formation (Early Cambrian) of Peary Land, central North Greenland

10.34194/rapggu.v137.8011 ◽

1988 ◽

Vol 137 ◽

pp. 33-41

Author(s):

M.R Blaker

Keyword(s):

Lower Cambrian ◽

New Genus ◽

Early Cambrian ◽

A new genus of nevadiid trilobite is described from the Lower Cambrian of Peary Land, central North Greenland, from the same horizon and locality from which a non-skeletised fauna has been recently reported. The new genus, BuenelIus, is tentatively assigned to the Nevadiidae Hupe, 1953, and comparisons are made with the genera Nevadia Walcott, 1910, Nevadella Raw, 1936, Callavia Matthew, 1897, Holmia Matthew, 1890 and Kjerulfia Kiaer, 1917.