scholarly journals Late Quaternary freshwater dinoflagellate cysts from the British Isles

1985 ◽  
Vol 4 (2) ◽  
pp. 101-109 ◽  
Author(s):  
Chris O. Hunt ◽  
Martha V. Andrews ◽  
David D. Gilbertson
Keyword(s):  
Fresh Water ◽  
Late Quaternary ◽  
British Isles ◽  
Dinoflagellate Cysts ◽  
Dinoflagellate Cyst ◽  
Fluvial Deposits

Abstract. Two species of peridinioid dinoflagellate cyst are described from Late Quaternary lacustrine and fluvial deposits in England and Scotland. Saeptodinium skipseaense sp. nov. has a bipesoid tabulation and a hemiepicystal archaeopyle. Colonsaydinium psilatum gen. et sp. nov. has a compound archaeopyle interpreted as 213P (1–2i 3–5″). The morphology of the archaeopyle suggests that this may be the cyst of a species with cinctoid tabulation. Both taxa are found only in sediment laid down in base-rich, non-turbulent, relatively deep fresh water.

scholarly journals Recent and Late Quaternary dinoflagellate cysts from the area of the Greenland –Iceland –Faeroe –Scotland Ridge

1984 ◽  
Vol 3 (2) ◽  
pp. 95-108 ◽  
Author(s):  
Rex Harland
Keyword(s):  
Continental Shelf ◽  
Late Quaternary ◽  
Dinoflagellate Cysts ◽  
Quaternary Sediments ◽  
The South ◽  
Northern Flank ◽  
Dinoflagellate Cyst ◽  
Southern Area

Abstract. Dinoflagellate cyst assemblages are described from Recent and Late Quaternary sediments recovered from Vema cores taken in the area of the Greenland – Iceland – Faeroe – Scotland Ridge. The dinoflagellate assemblage interpreted as indicating the Flandrian, “climatic” amelioration occurred in the sediments on the northern flank of the ridge whereas no evidence was found for this amelioration in the cores to the south. In the southern area, cyst assemblages proved an older climatic amelioration possibly of Eemian age. The potential for using dinoflagellate cysts to correlate oceanic and continental shelf areas is stressed.

A Preliminary Report of Changing Quaternary Mammal Faunas in Subalpine New Guinea

1993 ◽  
Vol 40 (1) ◽  
pp. 117-126 ◽  
Author(s):  
Geoffrey Hope ◽  
Tim Flannery ◽  
Boeardi
Keyword(s):  
Preliminary Report ◽  
Late Quaternary ◽  
Montane Forest ◽  
Mammal Species ◽  
Irian Jaya ◽  
Fluvial Deposits ◽  
Unknown Species ◽  
Holocene Record ◽  
Fossil Records ◽  
Mammal Faunas

AbstractThe faunas found in the mountains of central Irian Jaya have experienced dramatic changes through the late Quaternary. Remains of two previously unknown species of large marsupial, Maokopia ronaldi and Protemnodon hopei, have been recovered from unrelated cave and fluvial deposits which today occur in dense upper montane forest. Direct dating of the finds has not as yet been possible, but stratigraphic, sedimentologic, and palynologic evidence indicates that these species lived near a climatic treeline in subalpine grassland in the late Pleistocene. At higher altitudes a rockshelter provided the second known mid-Holocene record of Thylogale christenseni and Thylogale sp. cf. brunii, apparently extinct grassland wallabies. The two largest remaining subalpine mammal species are being locally exterminated by hunting, leaving only a large murid, Mallomys gunung, which weighs less than 2.0 kg. The area thus records the disappearance of a grassland-adapted fauna. The possum Pseudocheirops cupreus dominates in modem hunting returns, although this species is totally absent from the local fossil records. It may thus be in the process of invading a vacated and disturbed niche from the upper montane forest.

scholarly journals Dinoflagellate cyst stratigraphy of the Barremian to Albian, Lower Cretaceous, North-East Greenland – a summary

1994 ◽  
Vol 160 ◽  
pp. 68-72
Author(s):  
H Nøhr-Hansen
Keyword(s):  
Lower Cretaceous ◽  
Geological Survey ◽  
Hydrocarbon Potential ◽  
Dinoflagellate Cysts ◽  
East Greenland ◽  
Dinoflagellate Cyst ◽  
North East

As part of studies of the onshore hydrocarbon potential in East Greenland undertaken by the Geological Survey of Greenland (GGU), a project was initiated with the purpose of describing the dinoflagellate cyst stratigraphy of the Lower Cretaceous succession in East Greenland (72°76°N) and correlating the exposed sections throughout the region (Nøhr-Hansen, 1993). Based on the rather sporadic occurrence of macrofossils the Lower Cretaceous sediments of East Greenland was previously dated as Aptian to Albian (Spath, 1946; Maync, 1949; Donovan, 1953, 1955, 1957). Maync (1949) reported the total exposed thickness of the ‘Aptian-Albian series’ to be more than 2000 m, whereas Surlyk (1990) noted that the Lower Cretaceous shale succession reached a cumulative thickness or 1000 m. Furthermore, Donovan (1972) reported that Hauterivian and Barremian sediments were unknown in East Greenland. Dinoflagellate cysts recorded from 40 sections throughout the region have now dated the Lower Cretaceous sequence as Barremian to Albian, and correlation of sections yields a cumulative thickness of approximately 1500m (Nøhr-Hansen, 1993).

New species of dinoflagellate cysts and other palynomorphs from the latest Miocene and Pliocene of DSDP Hole 603C, western north Atlantic

2003 ◽  
Vol 77 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Martin J. Head ◽  
Geoffrey Norris
Keyword(s):  
New Species ◽  
North Atlantic ◽  
Deep Sea ◽  
New Genus ◽  
Dinoflagellate Cysts ◽  
New Genus And Species ◽  
Early Pliocene ◽  
Dinoflagellate Cyst ◽  
Lower Pleistocene ◽  
Drilling Project

Detailed investigation of the essentially complete uppermost Miocene through Lower Pleistocene sequence in Deep Sea Drilling Project (DSDP) Hole 603C, western North Atlantic, has revealed the presence of the new dinoflagellate cyst speciesLejeunecysta hatterasensis, Lejeunecysta interrupta, Corrudinium devernaliae, andPyxidinopsis vesiculata, as well as the acritarchsLeiosphaeridia rockhallensisHead new species andLeffingwellia costatanew genus and species. Independent magnetobiostratigraphic control of DSDP Hole 603C constrains the ranges of these new species.Lejeunecysta interruptan. sp. appears to range no higher than lowermost Pliocene at 5.2 Ma,Pyxidinopsis vesiculatan. sp. has a range top at about 4.5 Ma in the Lower Pliocene,Corrudinium devernaliaen. sp. has a well-defined range of 4.7–4.1 Ma within the Lower Pliocene, andLeiosphaeridia rockhallensisn. sp. has a similarly well-defined range of 4.4–3.9 Ma within the Lower Pliocene. The presence ofLeiosphaeridia rockhallensisn. sp. in the Ramsholt Member of the Coralline Crag Formation, eastern England, supports an Early Pliocene age for this member.

scholarly journals The Distribution of Gammarus Species in Estuaries. Part I

1947 ◽  
Vol 27 (1) ◽  
pp. 1-52 ◽  
Author(s):  
G. M. Spooner
Keyword(s):  
Fresh Water ◽  
Brackish Water ◽  
Field Work ◽  
Bottom Fauna ◽  
Qualitative Composition ◽  
British Isles ◽  
Free Swimming ◽  
The Status ◽  
Brackish Water Species ◽  
Water Species

The work of which an account is here given was largely carried out from the autumn of 1937 to the spring of 1940, when it was interrupted by the war. In taking it up again (in July 1945) while, facilities for field work are still limited, the author feels it useful to publish results as they stand and indicate where further work is considered advisable.In examinations of the free-swimming bottom fauna of the Tamar and other estuaries, attention was inevitably drawn to the populations of Gammarus species, which make up the greater bulk of it. Before quantitative observations were planned, some interesting points came to light with regard to the qualitative composition of populations. This aspect lent itself more readily to study and, though byno means a new field for exploration, soon proved worth examining ingreater detail than previous workers had attempted.The broad fact of a replacement of one Gammarus species by another in passing up an estuary was well enough known, though exact knowledge for the British Isles only starts from the time when G. zaddachi Sexton was recognized as a regular member of the upper estuarine fauna of the Tay (Bassindale, 1933; Alexander, Southgate & Bassindale, 1935) and of the Deben (Serventy, 1935). This species proved to be the main brackish-water species overlapping with the marine G. locusta (L.) near the seaward end, and with the fresh-water G. pulex (L.) at the river end (or ‘head’) of the estuary. The status in estuaries of two other brackish-water species, G. duebeni Lillj. and G. chevreuxi Sexton, remained obscure.

30 000 years of productivity and salinity variations in the late Quaternary Cariaco Basin revealed by dinoflagellate cysts

Boreas ◽  
2009 ◽  
Vol 38 (4) ◽  
pp. 647-662 ◽  
Author(s):  
KENNETH NEIL MERTENS ◽  
CATALINA GONZÁLEZ ◽  
IRINA DELUSINA ◽  
STEPHEN LOUWYE
Keyword(s):  
Late Quaternary ◽  
Cariaco Basin ◽  
Dinoflagellate Cysts ◽  
Salinity Variations

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 Re-study of some dinoflagellate cysts from the Oligocene and Miocene of Germany

1984 ◽  
Vol 3 (2) ◽  
pp. 73-94 ◽  
Author(s):  
William A. S. Sarjeant
Keyword(s):  
Middle Miocene ◽  
Type Material ◽  
New Combination ◽  
Late Oligocene ◽  
Dinoflagellate Cysts ◽  
Dinoflagellate Cyst ◽  
Northwest Germany ◽  
Senior Synonym ◽  
First Time

Abstract. The type material of six dinoflagellate cyst species from the Late Oligocene to Middle Miocene of northwest Germany, described originally by Gerlach (1961), is reillustrated and redescribed. It is shown to include representatives of nine species. Areosphaeridium (ex: Baltisphaeridium) pectiniforme is found to be a senior synonym of Areosphaeridium multicornutum Eaton. Systematophora placacantha is considered to be a senior synonym of Cleistosphaeridium (ex: Baltisphaeridium) panniforme (Gerlach). The new combination Rhynchodiniopsis tenuitabulata (Gerlarch) is proposed. Revised diagnoses for these three species and for Leptodinium membranigerum (Gerlach), Achomosphaera triangulata (Gerlach) and Lejeunecysta hyalina (Gerlach) are proposed. The morphology of a form described here for the first time, and tentatively attributed to Phthanoperidinium, is considered perhaps to imply a separate origin for the Phthanoperidiniaceae: for that reason familial, rather than tribal, rank is preferred for that group. The stratigraphical ranges of the nine species here recognised and of two others of Gerlach’s species redescribed in earlier papers are detailed; elimination of misattributed forms means that these ranges are shorter than the published literature suggests.

Sign in / Sign up

Export Citation Format

Share Document