69 research outputs found
Foraminifera from the Holocene of borehole 63 -01/08 northern North Sea (Møre Sheet)
Foraminifera from borehole 63 -01/08 were found to be very similar throughout, although there
was a slight increase in diversity towards the top of the hole. Cold water sinistrally coiled
Neogloboquadrina pachderma are abundant throughout and the benthos is characterised by
Planulina ariminensis and Oridorsalis umbonata with Epistominella exigua in some samples.
These deeper water species are characteristic of water depth in excess of c. 500
Foraminiferal biostratigraphy of the Chalk around Codford St Peter, Wilton and Quidhampton
Eight samples were examined for calcareous microfauna and Chalks of Cenomanian to Santonian age were recognised
Foraminifera from a suite of samples of London Clay on the Newbury sheet
A suite of samples of London Clay were submitted for micropalaeontological examination in
order to place them in a biostratigraphical framework
Late Cretaceous foraminifera from Lower Venson Farm Borehole
Three samples from Lower Venson Farm Borehole (TR35SW/27; TR3083 5305) were
examined. The foraminiferal faunas from 52 and 57 m depth indicate foraminiferal zone BGS13
and it is suggested that both are from the Lewes Chalk. The sample from 47m contains a fauna
from low within zone BGS14 and the very basal part of the Seaford Chalk (immediately above
the Upper East Cliff Marl, and lateral equivalents) is inferred
Foraminifera from the Chalk of the Newbury area (1:50K sheet 267)
This report describes the biostratigraphical age determinations of a suite of Chalk samples from
1:50K Sheet 267. Foraminifera indicate that Cenomanian to Santonian chalks are present
Biostratigraphical determinations for two samples from 1:50K sheet 283
This report describes the biostratigraphical age determinations of a suite of Chalk samples from
1:50K Sheet 283. Foraminifera indicate that Cenomanian chalks are present
The micropalaeontology of two samples of London Clay from the Newbury District (1:50K sheet 267)
This report describes the microfossils of two samples of London Clay collected from the
Newbury district. MPA 51707 (DTA687; Field number SU46SW/1) proves to be Early Eocene
in age and possibly basal Division E of KING (1984). MPA51708 (DTA688; Field number
SU46SW/2) lacked biostratigraphically useful foraminifera, but the presence of radiolaria
'Cenosphaera' sp, is used tentatively to suggest the early Eocene
Quaternary foraminifera from borehole 63 -01/11 (Møre Sheet)
Foraminifera from the lower part of borehole 63 -01/08 were extremely rare and probably
reworked from the shelf area. Reworked Palaeocene foraminifera and coalified wood were also
seen. At and above 0.42-0.45m foraminifera became common and there was a slight increase in
diversity towards the top of the hole. Cold water sinistrally coiled Neogloboquadrina
pachderma are abundant throughout and the benthos is characterised by Planulina ariminensis
and Oridorsalis umbonata. These deeper water species are characteristic of water depth in
excess of c. 500m. Possible warming was present at and above 0.18-0.21
Foraminifera from two samples in the Newbury neighbourhood
This report describes the foraminifera from two samples of Chalk from the Newbury sheet. Both
are of a similar age, the early part of foraminiferal zone BGS18 (probably Subzone 18ii), which
equates with the lower part of the socialis macrofaunal zone, can be recognised. The basal
Newhaven Chalk is inferred
Ostracods from freshwater and brackish environments of the Carboniferous of the Midland Valley of Scotland : the early colonization of terrestrial water bodies
The Mississippian Strathclyde Group of the Midland Valley of Scotland yields some of the earliest non-marine ostracods. The succession records shallow marine, deltaic, estuarine, lagoonal, lacustrine, fluvial and swamp environments representing a series of staging-posts between fully marine and limnetic settings. Macrofossils and ostracods are assigned to marine, marginal marine, brackish and freshwater environments based on their faunal assemblage patterns. Key brackish to freshwater ostracods are Geisina arcuata, Paraparchites circularis n. sp., Shemonaella ornata n. sp. and Silenites sp. A, associated with the bivalves Anthraconaia, Carbonicola, Cardiopteridium, Curvirimula, Naiadites, the microconchid ‘Spirorbis’, Spinicaudata and fish. Many Platycopina and Paraparchiticopina ostracods are interpreted as euryhaline, which corresponds with their occurrence in marine to coastal plain water bodies, and supports the ‘estuary effect’ hypothesis of non-marine colonization. The success of non-marine colonization by ostracods was dependent on the intrinsic adaptations of ostracod species to lower salinities, such as new reproductive strategies and the timing of extrinsic mechanisms to drive non-marine colonization, such as sea-level change. The genus Carbonita is the oldest and most common freshwater ostracod, and went on to dominate freshwater environments in the Late Palaeozoic
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