Lower Miocene Planktonic Foraminifera from a Borehole in the English Channel

1977 ◽  
Vol 23 (3) ◽  
pp. 297 ◽  
Author(s):  
D. Graham Jenkins
Keyword(s):  
Planktonic Foraminifera ◽  
English Channel ◽  
Lower Miocene

scholarly journals Age determinations of Neogene sediments from the English Channel and Western Approaches

1986 ◽  
Vol 5 (1) ◽  
pp. 5-6
Author(s):  
D. Graham Jenkins ◽  
Erlend Martini
Keyword(s):  
Middle Miocene ◽  
Planktonic Foraminifera ◽  
English Channel ◽  
Calcareous Nannoplankton ◽  
Lower Miocene ◽  
Published Evidence ◽  
Neogene Sediments ◽  
Age Range ◽  
Age Determinations

Abstract. Original published evidence indicated an age range of early Lower Miocene to early Middle Miocene for Globigerina silt samples from the English Channel and the Western Approaches. Suggested younger ages for these samples are refuted on the basis of planktonic foraminifera and calcareous nannoplankton.

Calcareous nannoplankton and the age of the Globigerina silts of the western approaches of the English Channel

1974 ◽  
Vol 111 (4) ◽  
pp. 303-306 ◽  
Author(s):  
E. Martini
Keyword(s):  
Atlantic Ocean ◽  
North Sea ◽  
English Channel ◽  
Calcareous Nannoplankton ◽  
Northern Germany ◽  
Lower Miocene ◽  
The North ◽  
The North Sea

SummaryCalcareous nannoplankton from the Globigerina silts of the western approaches of the English Channel indicate the presence of standard nannoplankton zones NN2, NN 4 and NN 5, part of which can be correlated with Neogene beds in Belgium and Northern Germany. The calcareous nannoplankton support the possibility of a connexion between the North Sea Basin and the Atlantic Ocean through the English Channel during part of the Lower Miocene.

Foraminiferal Faunas from the Lapithos Group of Cyprus

1961 ◽  
Vol 98 (3) ◽  
pp. 177-194
Author(s):  
A. E. Cockbain
Keyword(s):  
Upper Cretaceous ◽  
Planktonic Foraminifera ◽  
Faunal Assemblage ◽  
Lower Miocene ◽  
Lower Upper ◽  
Upper Oligocene

AbstractThis paper reviews the stratigraphic micropalaeontology of the Lapithos Group of Cyprus, which is now known to be Upper Cretaceous to Lower Miocene in age. A three-fold subdivision, on the basis of planktonic foraminifera, into Lower (Upper Cretaceous) Middle (Danian to Eocene) and Upper (Oligocene to Lower Miocene) Lapithos Formations is suggested and a summary of the outcrops of each formation is given. The foraminiferal faunas of the Lapithos Group are discussed and it can be shown that a planktonic and a neritic faunal assemblage is present in each formation. The Terra Limestone, hitherto considered as part of the Dhali Group, shows faunal affinities with the Upper Lapithos neritic facies and is therefore placed in the Lapithos Group.

scholarly journals Planktonic and benthic foraminiferal biostratigraphy of the Middle Eocene–Lower Miocene successions from the Sivas Basin (Central Anatolia, Turkey)

2016 ◽  
Vol 67 (1) ◽  
pp. 21-40 ◽  
Author(s):  
Aynur Hakyemez ◽  
Nazire Özgen-Erdem ◽  
Özgen Kangal
Keyword(s):  
Water Column ◽  
Benthic Foraminifera ◽  
Middle Eocene ◽  
Planktonic Foraminifera ◽  
Central Anatolia ◽  
Successive Interval ◽  
Lower Miocene ◽  
Sivas Basin ◽  
Algal Reef ◽  
Foraminiferal Biostratigraphy

AbstractPlanktonic and benthic foraminifera are described from the Middle Eocene-Lower Miocene successions in the Sivas Basin, Central Anatolia. An integrated foraminiferal zonation provides new age assignments in terms of a great number of taxa for the studied sections. Four biostratigraphical intervals are first recorded based on the concurrent ranges of sporadically occurring but well preserved planktonic foraminiferal assemblages. The first interval characterized by the co-occurrences ofAcarinina bullbrooki, Truncorotaloides topilensisandTurborotalia cerroazulensisis referable to the E11 Zone of late Lutetian–early Bartonian. An assemblage yieldingParagloborotalia opimaaccompanied byGlobigerinella obesaforms a basis for the late Chattian O5 Zone. The successive interval corresponds to the late Chattian O6 Zone indicated by the presence ofGlobigerina ciperoensisandGlobigerinoides primordiusalong with the absence ofParagloborotalia opima. The early Aquitanian M1 Zone can be tentatively defined based mainly on the assemblage ofGlobigerina, Globigerinella, GloboturborotalitaandTenuitella. The biostratigraphical data obtained from the benthic foraminifera assign the studied sections to the SBZ 21–22, SBZ 23 and SBZ 24 ranging in age from Rupelian to Aquitanian. The SBZ 23 and 24 are well constrained biozones by the occurrences ofMiogypsinella complanataandMiogypsina gunteri, respectively, whereas the SBZ 21–22 defined by nummulitids and lepidocylinids in the Tethyan Shallow Benthic Zonation is characterized dominantly by peneroplids, soritids and miliolids in the studied sections. Benthic foraminiferal assemblages suggest different paleoenvironments covering lagoon, algal reef and shallow open marine whereas planktonic foraminifera provides evidence for relatively deep marine settings on the basis of assemblages characterized by a mixture of small-sized simple and more complex morphogroups indicative for intermediate depths of the water column.

Radiometric dates and planktonic foraminifera of the Lower Miocene

1971 ◽  
Vol 14 (4) ◽  
pp. 905-910
Author(s):  
D. Graham Jenkins ◽  
Orville L. Bandy ◽  
N. de B. Hornibrook
Keyword(s):  
Planktonic Foraminifera ◽  
Lower Miocene ◽  
Radiometric Dates

scholarly journals Paleoclimate of Upper Oligocene-Lower Miocene Temburong Formation, Klias Peninsula, Sabah, Base on Planktonic Foraminifera Assemblage

2019 ◽  
Vol 1358 ◽  
pp. 012071
Author(s):  
J Asis ◽  
S Tahir ◽  
B Musta ◽  
B Jasin ◽  
HFW Soehady ◽  
...  
Keyword(s):  
Planktonic Foraminifera ◽  
Lower Miocene ◽  
Upper Oligocene

scholarly journals An Early Miocene biserial foraminiferal event in the Transylvanian Basin (Romania)

2010 ◽  
Vol 61 (3) ◽  
pp. 227-234 ◽  
Author(s):  
Claudia Beldean ◽  
Sorin Filipescu ◽  
Ramona Bălc
Keyword(s):  
Middle Miocene ◽  
Planktonic Foraminifera ◽  
Early Miocene ◽  
High Abundance ◽  
Calcareous Nannoplankton ◽  
Lower Miocene ◽  
Precise Identification ◽  
Pacific Area

An Early Miocene biserial foraminiferal event in the Transylvanian Basin (Romania)Investigations of the Lower Miocene of the Transylvanian Basin reveal particularly high abundances (> 90 % of total foraminifera) of small sized biserial foraminifera (Bolivina/Streptochilus). This biotic event has not been noticed in the Transylvanian Basin so far probably owing to the facies misinterpretation and the small size of the specimens. SEM investigations allow more precise identification of biserial planktonic taxa and more accurate taxonomic interpretations. The high abundance ofBolivina/Streptochilusassemblages provide evidence for paleogeographic connections to the Indo-Pacific area and support new paleoenvironmental interpretations at the transition from the Early to Middle Miocene in relation to the paleoceanographic events. Both planktonic foraminifera and calcareous nannoplankton suggest a late Burdigalian age. A newBolivina/StreptochilusAbundance Biozone is proposed just below the Early/Middle Miocene boundary.

Ultrastructure of Some Planktonic Formainifera

1974 ◽  
Vol 32 ◽  
pp. 190-191
Author(s):  
William H. Zucker
Keyword(s):  
Cell Biology ◽  
Water Mass ◽  
Planktonic Foraminifera ◽  
Uranyl Acetate ◽  
Ethanol Dehydration ◽  
Globigerinoides Ruber ◽  
Light Microscope Level ◽  
Globigerina Bulloides ◽  
Glutaraldehyde Solution ◽  
Diamond Knife

Planktonic foraminifera are widely-distributed and abundant zooplankters. They are significant as water mass indicators and provide evidence of paleotemperatures and events which occurred during Pleistocene glaciation. In spite of their ecological and paleological significance, little is known of their cell biology. There are few cytological studies of these organisms at the light microscope level and some recent reports of their ultrastructure.Specimens of Globigerinoides ruber, Globigerina bulloides, Globigerinoides conglobatus and Globigerinita glutinata were collected in Bermuda waters and fixed in a cold cacodylate-buffered 6% glutaraldehyde solution for two hours. They were then rinsed, post-fixed in Palade's fluid, rinsed again and stained with uranyl acetate. This was followed by graded ethanol dehydration, during which they were identified and picked clean of debris. The specimens were finally embedded in Epon 812 by placing each organism in a separate BEEM capsule. After sectioning with a diamond knife, stained sections were viewed in a Philips 200 electron microscope.

Sign in / Sign up

Export Citation Format

Share Document