scholarly journals Late Bathonian to Early Oxfordian dinoflagellate cyst stratigraphy of Jameson Land and Milne Land, East Greenland

1988 ◽  
Vol 137 ◽  
pp. 135-159
Author(s):  
M Smelror
Keyword(s):  
New Species ◽  
Upper Jurassic ◽  
East Greenland ◽  
Dinoflagellate Cyst ◽  
Lower Upper ◽  
Two New Species

The stratigraphic distribution of Upper Bathonian to early Middle Oxfordian dinoflagelIate cysts from localities in Jameson Land and in Milne Land, East Greenland, is evaluated. Using the range of selected species, their earliest appearances andlor extinction, six dinoflagelIate cyst zones and five subzones are proposed for the upper Middle and lower Upper Jurassic succession of central East Greenland. The proposed zonation scheme is correlated with the ammonite zonation of the investigated interval. Two new species, Chytroeisphaeridia grossa sp. nov. and Escharisphaeridia laevigata sp. nov. are formally described.

scholarly journals Maximum Middle Jurassic transgression in East Greenland: evidence from new ammonite finds, Bjørnedal, Traill Ø

2004 ◽  
Vol 5 ◽  
pp. 31-49 ◽  
Author(s):  
Peter Alsen ◽  
Finn Surlyk
Keyword(s):  
New Species ◽  
Middle Jurassic ◽  
Upper Jurassic ◽  
Middle Part ◽  
The South ◽  
East Greenland ◽  
Lower Upper ◽  
North East ◽  
A New Species ◽  
Lower Callovian

A Middle – lower Upper Jurassic sandstone-dominated succession, more than 550 m thick, with mudstone intercalations in the middle part is exposed in Bjørnedal on Traill Ø, North-East Greenland. A number of ammonite assemblages have been found, mainly in the mudstones. They indicate the presence of the Lower Callovian Cadoceras apertum and C. nordenskjoeldi Chronozones. The mudstones represent northern wedges of the Fossilbjerget Formation hitherto known only from Jameson Land to the south. In Bjørnedal they interfinger with sandstones of the Pelion and Olympen Formations. The presence of the Fossilbjerget Formation in this region indicates complete drowning of the Middle Jurassic sandstone-dominated Pelion Formation during maximum Middle Jurassic transgression. A new species, Kepplerites tenuifasciculatus, is described in the appendix by J.H. Callomon. The holotype and paratype are from Jameson Land, East Greenland, but the species is also found in Bjørnedal, Traill Ø, North-East Greenland.

scholarly journals Dinoflagellate cysts and acritarchs from the Middle and Upper Jurassic of Jameson Land, East Greenland

1979 ◽  
Vol 132 ◽  
pp. 1-98
Author(s):  
R.A Fensome
Keyword(s):  
New Species ◽  
New Genus ◽  
Detailed Examination ◽  
Upper Jurassic ◽  
Dinoflagellate Cysts ◽  
Specific Level ◽  
East Greenland ◽  
Two Samples ◽  
Two New Species ◽  
Organic Remains

Twenty-six samples from the Middle and Upper Jurassic strata of Jameson Land were prepared; twenty-one of these were found to contain organic-walled microplankton, of which seventeen yielded assemblages worthy of detailed examination. A new genus (Ambonosphaera) and six new species (Sentusidinium myriatrichum, Sentusidinium pelionense, Ellipsoidictyum gochtii, Pareodinia brachythelis, Gonyaulacysta birkelundii, and Ambonosphaera calioviana) of dinoflagellates, and two new species of acritarchs (Veryhachium sortehatense and Solisphaeridium ankyleton) were discovered. One taxon, Gonyaulacysta pectinigera, is elevated from subspecific to specific level and its generic reallocation is proposed. Samples from the Sortehat and Pelion Members of the Vardekløft Formation and from the Olympen formation yielded poor assemblages in terms of the number of taxa present and are therefore not especially biostratigraphically useful. However, previous Bajocian and Lower Oxfordian dates for the Sortehat Member and Olympen Formation respectively are supported. Moderately rich assemblages from some samples from the Fossilbjerget Member of the Vardekløft Formation and from the Hareelv Formation indicate Bathonian--Callovian and Oxfordian-Kimmeridgian ages respectively. Two samples, one from each of these units, contain organic-walled microplankton assemblages indicative of a date approximately one half stage earlier than that derived from ammonite faunas. All but one of the samples prepared from the Raukelv Formation contain only carbonized organic remains. One sample, from the Fynselv Member, yielded an assemblage of organic-walled microplankton which, although not conclusive themselves in suggesting a date, do not contradict the latest Jurassic assignation based on ammonite faunas.

The problematic fossil Triplicatella from the Early Cambrian of Greenland, Canada, and Siberia

2004 ◽  
Vol 41 (11) ◽  
pp. 1273-1283 ◽  
Author(s):  
Christian B Skovsted ◽  
John S Peel ◽  
Christian J Atkins
Keyword(s):  
New Species ◽  
Functional Morphology ◽  
Lower Cambrian ◽  
Early Cambrian ◽  
Taxonomic Affinity ◽  
East Greenland ◽  
North East ◽  
Close Proximity ◽  
Two New Species

The cap-shaped Early Cambrian fossil Triplicatella, previously known only from Australia, is reported from the upper Lower Cambrian of North and North-East Greenland, western Newfoundland, and Siberia. The occurrence of Triplicatella in Laurentia strengthens faunal ties between Laurentia and the Australian margin of Gondwana in late Early Cambrian times and supports hypotheses advocating the close proximity for the two palaeocontinents. Two new species, Triplicatella sinuosa n. sp., and T. peltata n. sp. are described, morphological details of which help elucidate the functional morphology and taxonomic affinity of the group. Three opercular types attributable to Triplicatella are left in open taxonomy. The postulated affinity of Triplicatella to hyoliths is confirmed, although the genus can not be placed within either of the two orders of hyoliths currently recognized.

scholarly journals Review of the dinoflagellate cyst <i>Stephanelytron</i> Sarjeant 1961 emend

1999 ◽  
Vol 18 (2) ◽  
pp. 169-182 ◽  
Author(s):  
Bernard Courtinat
Keyword(s):  
New Species ◽  
New Combinations ◽  
Dinoflagellate Cyst ◽  
Peripatric Speciation ◽  
Two New Species ◽  
Endemic Population ◽  
New Evidence ◽  
Upper Callovian ◽  
Posterior Position ◽  
Stratigraphic Range

Abstract. The stratigraphic distribution of the Late Callovian to Early Oxfordian dinoflagellate cyst Stephanelytron Sarjeant 1961 emend provides new evidence pertaining to its evolution. Middle and Upper Callovian times favoured the development of speciations to a short-ranging Stephanelytron community with corona(s) in ventral–posterior position (Stephanelytron brontes, S. callovianum, S. ceto and S. tabulophorum) from eurytopic species with antapical coronas (S. caytonense, S. membranoidium, S. redcliffense and S. scarburghense). The former group of species (except S. tabulophorum) may represent an example of peripatric speciation from an unfavourable mutation. The reduced stratigraphic range gives the appearance of an endemic population. The genus Lagenadinium Piel, 1985 is a junior synonym of Stephanelytron Sarjeant, 1961. A new emendation of Stephanelytron, two new combinations (S. callovianum and S. membranoidium) and two new species (?S. brontes and S. ceto) are proposed.

Dinoflagellate cysts from an allochthonous block of Nordenskjöld Formation (Upper Jurassic), north-west James Ross Island

1992 ◽  
Vol 4 (3) ◽  
pp. 267-278 ◽  
Author(s):  
Michael G. Snape
Keyword(s):  
New Species ◽  
Papua New Guinea ◽  
Antarctic Peninsula ◽  
Late Jurassic ◽  
New Genus ◽  
Upper Jurassic ◽  
Dinoflagellate Cysts ◽  
Dinoflagellate Cyst ◽  
North West ◽  
James Ross Island

An allochthonous block of the Nordenskjöld Formation from north-west James Ross Island, Antarctic Peninsula has yielded a diverse marine palynoflora. Dinoflagellate cyst assemblages from the 185 m thick sequence are described and compared with similar microfloras previously described from Australia, Papua New Guinea and Madagascar. A mid Tithonian (Late Jurassic) age is suggested for the section. One new genus, Helbydinium gen. nov. and four new species, Helbydinium scabratum sp. nov., Leptodinium acneum sp. nov., Leptodinium posterosulcatum sp. nov. and Rhynchodiniopsis foveata sp. nov. are described.

scholarly journals A note on the nomenclature of some Upper Jurassic dinoflagellate cyst taxa

1982 ◽  
Vol 1 (1) ◽  
pp. 53-53 ◽  
Author(s):  
Michael J. Fisher ◽  
Leslie A. Riley
Keyword(s):  
New Species ◽  
Upper Jurassic ◽  
Dinoflagellate Cyst ◽  
Publication Delay

Abstract. In 1980, several new species of dinoflagellate cyst taxa were validly published and named from the Kimmeridge Clay of England as part of a larger study on Kimmeridgian-Valanginian dinoflagellate cyst assemblages (Fisher &amp; Riley, 1980); this study was originally presented at the IV International Palynological Conference, Lucknow in 1976–77. This note, necessitated by the long publication delay and numerous printing errors, comprises taxonomic re-allocations, taking account of subsequent studies (Norris, 1978; Stover &amp; Evitt, 1978; Davey, 1979; Riley, 1979) and corrects inadvertent taxonomic errors.

scholarly journals Jurassic dinoflagellate cyst stratigraphy of Hold with Hope, North-East Greenland

2004 ◽  
Vol 5 ◽  
pp. 73-88 ◽  
Author(s):  
Stefan Piasecki ◽  
Michael Larsen ◽  
Jens Therkelsen ◽  
Henrik Vosgerau
Keyword(s):  
Upper Jurassic ◽  
Dinoflagellate Cysts ◽  
East Greenland ◽  
Dinoflagellate Cyst ◽  
North East ◽  
Lowermost Part ◽  
Early Late

Dinoflagellate cysts of the Middle–Upper Jurassic succession on northern Hold with Hope have been studied in order to establish a biostratigraphic framework and to date the succession. The Pelion Formation is characterised by abundant Chytroeisphaeridia hyalina and Sentusidinium spp., with some Ctenidodinium thulium and Paragonyaulacysta retiphragmata in the lower part. Mendicodinium groenlandicum appears higher in the formation followed by Trichodinium scarburghense in the upper part. The succeeding Payer Dal Formation contains Scriniodinium crystallinum, Rigaudella aemula and Leptodinium subtile in the lower part and Dingodinium jurassicum and Prolixosphaeridium granulosum in the uppermost part. The Bernbjerg Formation contains abundant Sirmiodinium grossii and Gonyaulacysta jurassica. Adnatospahaeridium sp., Cribroperidinium granuligerum, Glossodinium cf. dimorphum and Scriniodinium irregulare appear in the lower part of the formation, followed by Avellodinium spp. in the highest part. The dinoflagellate cyst assemblages in the Pelion Formation indicate an Early–Late Callovian age (C. apertum – P. athleta Chronozones). This is supported by ammonites in the lower part of the formation, which refer to the C. apertum and P. koenigi Chronozones. A significant hiatus, from Late Callovian to Middle Oxfordian, is present between the Pelion Formation and the overlying Payer Dal Formation. The age of the Payer Dal Formation is Middle Oxfordian to earliest Late Oxfordian (C. tenuiserratum – A. glosense Chronozones). The Payer Dal Formation is conformably overlain by the Bernbjerg Formation of Late Oxfordian to possibly earliest Kimmeridgian age (A. glosense – P. baylei Chronozones). The A. glosense Chronozone is also documented by abundant ammonites in the lowermost part of the formation.

A new genus and two new species of fossil Elaterids from the Yixian Formation of Western Liaoning, China (Coleoptera: Elateridae)

Zootaxa ◽  
2008 ◽  
Vol 1785 (1) ◽  
pp. 54 ◽  
Author(s):  
HUALI CHANG ◽  
FAN ZHANG ◽  
DONG REN
Keyword(s):  
New Species ◽  
Early Cretaceous ◽  
Late Jurassic ◽  
New Genus ◽  
Upper Jurassic ◽  
Yixian Formation ◽  
Western Liaoning ◽  
Two New Species

A new genus and two new species of fossil Elateridae are described and illustrated: Paralithomerus gen. nov., P. exquisitus sp. nov, and P. parallelus sp. nov. Both species were collected from the Late Jurassic-Early Cretaceous Yixian Formation of western Liaoning, China. Fossil elaterids expressing a sutured mesoventrite have been otherwise discovered only from the Upper Jurassic strata of Karatau.

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