Benthic foraminifera from the Albian shallow-marine limestones in the Geyik Dağı area (Central Taurides), southern Turkey

2021 ◽  
pp. 1-21
Author(s):  
Cemile Solak ◽  
Kemal Taslı ◽  
Hayati Koç
Keyword(s):  
Benthic Foraminifera ◽  
Carbonate Platform ◽  
Larger Benthic Foraminifera ◽  
Shallow Marine ◽  
Southern Turkey ◽  
Lowermost Part ◽  
First Time ◽  
High Diversity ◽  
Open Shelf

Abstract Cretaceous carbonates in the Geyik Dağı area (Central Taurides, southern Turkey) are represented by two successions with different paleoenvironmental settings: open shelf to slope succession of Cenomanian to Danian age and inner platform succession of Albian to Maastrichtian age, which is interrupted by a post-Cenomanian disconformity. Outcropped lowermost part of the platform-type one is composed of rudistid limestones corresponding to the Urgonian-type carbonates and belongs to the Geyik Dağı Unit (=Anamas-Akseki Carbonate Platform). It contains a rich assemblage of larger benthic foraminifera including orbitolinid, chrysalidinid, cuneolinid, nezzazatid, and miliolid taxa, which has been illustrated and documented here for the first time from the upper Albian of the Tauride Carbonate Platform. The occurrence of such a diversified foraminiferal fauna indicates a prominent high diversity that took place in the Tauride Carbonate Platform during the late Albian time, which corresponds to a major emersion period in some parts of the platform.

The incidence of unusual test morphologies of Eocene Larger benthic foraminifera: An example of Paleogene Adriatic Carbonate Platform

2021 ◽  
Author(s):  
Vlasta Ćosović ◽  
Jelena Španiček ◽  
Katica Drobne ◽  
Ervin Mrinjek
Keyword(s):  
Benthic Foraminifera ◽  
Carbonate Platform ◽  
Middle Eocene ◽  
Morphological Diversity ◽  
Late Eocene ◽  
Early Eocene ◽  
Coralline Red Algae ◽  
Larger Benthic Foraminifera ◽  
Shallow Marine ◽  
Scientific Project

<p>The Paleogene Adriatic carbonate platform(s) existed within the Central NeoTethys (around 32 N paleolatitude) from the Danian to the late Eocene (Bartonian/Priabonian) and produced a succession of limestones up to 500 m thick, rich in larger benthic foraminifera (LBF). The Eocene sediments are widely distributed along the eastern Adriatic coast and have been studied for many years. Taking into account the climatic changes that took place within the Eocene (Early Eocene and Middle Eocene climatic optima, known as EECO, MECO), special attention was paid to the composition of shallow-marine foraminiferal assemblages. The studies reveal the following trends: (1) the alveolinid-dominated assemblages were replaced by nummulitid-dominated assemblages around the MECO; (2) the greater species and morphological diversity (spherical, ellipsoid, extremely elongated fusiform) of the alveolinid fauna was evident at the EECO; (3) the nummulitid-dominated fauna was characterized by less diversified assemblages compared to the alveolinid ones and by the co-occurrence of scleractinian corals, coralline red algae and aborescent foraminifera. The occurrence of twin embryos has been assigned to the early Eocene in the alveolinid populations, especially in Alveolina levantina and A. axiampla (in some sections, the frequency is greater than 5%), and these coalesced embryos have the same size as the single form (usually they are smaller). The LBF assemblages of Middle Eocene showed a greater frequency of doubled adult tests (Orbitolites sp., Nummulites sp.). The origin of these unusual morphologies is poorly known, usually described as the results of stressful conditions. Considering the timing of the appearance of such morphologies, temperature and associated changes in the shallow-marine environment could be the cause.</p><p>This study is carried out as part of the scientific project IP-2019-04-5775 BREEMECO, funded by Croatian Scientific Foundation.</p>

scholarly journals A Brief Report of Five Newly Recorded Korean Modern Benthic Foraminiferal Species

Taxonomy ◽  
2021 ◽  
Vol 1 (4) ◽  
pp. 438-447
Author(s):  
Somin Lee ◽  
Fabrizio Frontalini ◽  
Wonchoel Lee
Keyword(s):  
Species Diversity ◽  
East China Sea ◽  
Benthic Foraminifera ◽  
Southern China ◽  
Subtidal Zone ◽  
Larger Benthic Foraminifera ◽  
Korean Waters ◽  
Foraminiferal Species ◽  
China And Japan ◽  
First Time

The present study describes five newly recorded modern benthic foraminiferal species from the subtidal zone near Jeju Island and East China Sea (Korea). The newly recorded species (Karrerulina conversa, Rotaliammina trumbulli, Vertebralina striata, Pegidia dubia and Amphistegina radiata) belong to five families (Prolixoplectidae, Trochamminidae, Fischerinidae, Pegidiidae and Amphisteginidae), three orders (Lituolida, Miliolida and Rotaliida) and two classes (Globothalamea and Tubothalamea). All these five genera (Karrerulina, Rotaliammina, Vertebralina, Pegidia and Amphistegina) were also reported for the first time from Korean waters. Most of the examined specimens were highly consistent morphologically with previous records from southern China and Japan. Additionally, Amphistegina is one of the symbiont-bearing larger benthic foraminifera, known to be mainly distributed in tropical to warm subtropical waters. This study contributes to the expansion of data on the recent foraminiferal species diversity in Korean waters.

Phenacophragma Oezeri N. SP., a Benthic Foraminifera from Albian Shallow Marine Carbonates of the Geyİk Daği Area (Southern Turkey)

2020 ◽  
Vol 50 (4) ◽  
pp. 373-381
Author(s):  
Cemile Solak ◽  
Kemal Taslı
Keyword(s):  
New Species ◽  
Benthic Foraminifera ◽  
Type Species ◽  
Shallow Marine ◽  
Southern Turkey ◽  
Marine Carbonates

Abstract Phenacophragma oezeri n. sp. (phylum Foraminifera, family Mayncinidae) is described from the Albian shallow-marine limestones of the Geyik Daği area, Central Taurides, S Turkey. It is characterized by a lenticular, completely involute test with eight to nine wedge-shaped chambers in the last whorl rapidly increased in height and by an areal and small slit-like aperture. It occurs in benthic foraminiferal wackestone/packstone and grainstone microfacies with gastropods, rudists and dasycladalean algae, in association with mainly Protochrysalidina elongata, Pseudonummoloculina aurigerica, Pseudonummoloculina heimi, Mayncina bulgarica, Mesorbitolina gr. texana, Cuneolina sliteri, Cuneolina parva, Akcaya minuta, and Akcaya auruncensis. This new species differs from the type species Phenacophragma assurgens in having a completely involute and lenticular test with less numerous chambers in the last whorl. It can be distinguished from the accompanied Mayncina bulgarica by its more axially compressed lenticular shape and its wedge-shaped (rather than falciform) chambers.

scholarly journals Three dimensional reconstructions of Nummulites tests reveal complex chamber shapes

2015 ◽  
Author(s):  
Willem Renema ◽  
Laura Cotton
Keyword(s):  
Benthic Foraminifera ◽  
Three Dimensional ◽  
3D Reconstructions ◽  
Thin Sections ◽  
Larger Benthic Foraminifera ◽  
Shallow Marine ◽  
Marine Deposits ◽  
Regular Shape ◽  
Computed Microtomography

Larger benthic foraminifera (LBF) are an important tool for the biostratigraphy of (sub)tropical shallow marine deposits. In Paleogene the genus Nummulites is an important genus for biostratigraphical zonation schemes. However, classification is Europe centered and based on external characters and equatorial thin sections. New results from regions outside the northern Tethys shows that a more rigid framework for the classification of nummulites is needed. Here we present a new tool for achieving this goal. We visualise 3D chamber shape of Nummulites djodjokartae and compare these to traditional morphometrical characters. To achieve this goal we use computed microtomography of well preserved Nummulites tests. We find that despite the regular shape in equatorial and axial thin section 3D chamber shape is not predicted by these sections. We argue that 3D reconstructions of Nummulites tests will be a great aid in improving our understanding lineages within the genus Nummulites, and to elucidate its evolutionary and biogeographical history.

scholarly journals FIRST RECORD OF CALCAREOUS GREEN ALGAE (DASYCLADALES, HALIMEDACEAE) FROM THE PALEOCENE CHEHEL KAMAN FORMATION OF NORTH-EASTERN IRAN (KOPET-DAGH BASIN)

2021 ◽  
pp. 51-64
Author(s):  
FELIX SCHLAGINTWEIT ◽  
KOOROSH RASHIDI ◽  
ABDOLMAJID MOSAVINIA
Keyword(s):  
Shallow Water ◽  
Green Algae ◽  
Benthic Foraminifera ◽  
First Record ◽  
Larger Benthic Foraminifera ◽  
Eastern Iran ◽  
North Eastern ◽  
Kopet Dagh ◽  
First Time ◽  
Upper Paleocene

The micropalaeontological inventory of the shallow-water carbonates of the Paleocene Chehel-Kaman Formation cropping out in the Kopet-Dagh Basin of north-eastern Iran is poorly known. New sampling has evidenced for the first time the occurrence of layers with abundant calcareous green algae including Dasycladales and Halimedaceae. The following dasycladalean taxa have been observed: Jodotella veslensis Morellet & Morellet, Cymopolia cf. mayaense Johnson & Kaska, Neomeris plagnensis Deloffre, Thyrsoporella-Trinocladus, Uteria aff. merienda (Elliott) and Acicularia div. sp. The studied section is devoid of larger benthic foraminifera and can be referred to the middle-upper Paleocene (SBZ 2-4) due to the presence of Rahaghia khorassanica (Rahaghi). Some of the dasycladalean taxa are herein reported for the first time not only from Iran but also the Central Neotethyan realm.

First report of Acanthochaetetes (Porifera: Demospongiae) from the Cretaceous Khalsi Formation, Ladakh Himalaya, India

2021 ◽  
pp. 1-9
Author(s):  
Prasenjit Barman ◽  
Francisco Sánchez-Beristain ◽  
Shruti Ranjan Mishra ◽  
Mohd Ibrahim ◽  
Narendra Kumar Swami ◽  
...  
Keyword(s):  
Growth Form ◽  
Carbonate Platform ◽  
Sedimentation Rates ◽  
Shallow Marine ◽  
Faunal Assemblages ◽  
Marine Carbonate ◽  
Upper Hauterivian ◽  
Ladakh Himalaya ◽  
New Finding ◽  
First Time

Abstract The Cretaceous chaetetid sponge Acanthochaetetes huauclillensis Sánchez-Beristain and García-Barrera is reported for the first time from the Aptian–Cenomanian Khalsi Formation, Ladakh Himalaya, India. Its low- to high-domical growth form could suggest an adaptation to either an environment with constant sedimentation rates, or to an irregular substrate. However, these growth forms also may indicate an absence of important environmental/sedimentological changes during the lifespan of the sponges. In addition, the growth form of this species suggests a calm, non-turbulent, reef-like microenvironment. Along with the other faunal assemblages, such as the rudists, corals, and the gastropod Nerinea, A. huauclillensis indicates a tropical to subtropical shallow marine carbonate platform setting. This new finding extends its stratigraphic range from the upper Hauterivian to the Aptian–Cenomanian interval in the eastern Tethyan realm.

scholarly journals Three dimensional reconstructions of Nummulites tests reveal complex chamber shapes

2015 ◽  
Author(s):  
Willem Renema ◽  
Laura Cotton
Keyword(s):  
Benthic Foraminifera ◽  
Three Dimensional ◽  
3D Reconstructions ◽  
Thin Sections ◽  
Larger Benthic Foraminifera ◽  
Shallow Marine ◽  
Marine Deposits ◽  
Regular Shape ◽  
Computed Microtomography

Larger benthic foraminifera (LBF) are an important tool for the biostratigraphy of (sub)tropical shallow marine deposits. In Paleogene the genus Nummulites is an important genus for biostratigraphical zonation schemes. However, classification is Europe centered and based on external characters and equatorial thin sections. New results from regions outside the northern Tethys shows that a more rigid framework for the classification of nummulites is needed. Here we present a new tool for achieving this goal. We visualise 3D chamber shape of Nummulites djodjokartae and compare these to traditional morphometrical characters. To achieve this goal we use computed microtomography of well preserved Nummulites tests. We find that despite the regular shape in equatorial and axial thin section 3D chamber shape is not predicted by these sections. We argue that 3D reconstructions of Nummulites tests will be a great aid in improving our understanding lineages within the genus Nummulites, and to elucidate its evolutionary and biogeographical history.

scholarly journals The Geographic, Environmental and Phylogenetic Evolution of the Alveolinoidea from the Cretaceous to the Present Day.

2020 ◽  
Author(s):  
Marcelle Boudagher-Fadel ◽  
Geoffrey David Price
Keyword(s):  
Sea Level ◽  
Convergent Evolution ◽  
Systematic Analysis ◽  
Larger Benthic Foraminifera ◽  
Shallow Marine ◽  
Marine Carbonates ◽  
New Material ◽  
Phylogenetic Evolution ◽  
Global Sea Level ◽  
First Time

The superfamily Alveolinoidea is a member of the Order Miliolida, and is comprised of three main families, the Alveolinidae, the Fabulariidae and the Rhapydioninidae. They are examples of Larger Benthic Foraminifera (LBF), which are single cell organisms with specific characteristic endoskeletons. Alveolinoids are found globally from the Cretaceous to present day and are very important biostratigraphic index fossils in shallow-marine carbonates. They are often associated with significant hydrocarbon reservoirs, and exhibit provincialism with characteristic genera often confined to one of the American, Tethyan or Indo-Pacific provinces. Previously, the systematic study of the global interrelationship between the various alveolinoid lineages has not been possible because of the absence of biostratigraphic correlation between the geographically scattered assemblages, and the scarcity of described material from the Indo-Pacific province. Here we use the literature and new material from the Americas, the French Alps, Iran, Tibet, India and SE Asia, coupled with the use the planktonic foraminiferal zonal (PZ) correlation scheme to put forward, for the very first time, a comprehensive, global, systematic analysis of the biostratigraphic, phylogenetic and palaeogeographic evolution of the alveolinoids. The alveolinoids originated in the Cretaceous in the Tethyan province. During a global sea-level low-stand, a westward migration of some alveolinoids species to the Americas occurred in this period, a behaviour also seen in previous studies of contemporaneous orbitolinid LBF. After the K-P event, which saw the extinction of all Cretaceous alveolinoids, rare new forms of alveolinoids evolved again, first in the Americas and later independently in Tethys. As found in previous studies of rotalid LBF, sea-level low-stands in the Paleocene also allowed some alveolinoid forms to migrate, but this time in an eastward direction from the Americas to Tethys, and from Tethys on to the Indo-Pacific. Alveolinoids still exist today ( Borelis and Alveolinella ), the former of which is cosmopolitan, while the latter is restricted to the Indo-Pacific province. Throughout their phylogenetic history alveolinoids characteristically exhibit convergent evolution, with the repeated re-occurrence of certain morphological features. Understanding this propensity to homoplasy is essential in understanding and constructing the phylogenetic relationships within the alveolinoid superfamily.

scholarly journals Biostratigraphy and Sequence Stratigraphy of Paleogene Deposits in Central Kopet-Dagh Basin (NE of Iran)

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Batool Rivandi ◽  
Mohammad Vahidinia ◽  
Mehdi Nadjafi ◽  
Asadollah Mahboubi ◽  
Abbas Sadeghi
Keyword(s):  
Sea Level ◽  
Sequence Stratigraphy ◽  
Benthic Foraminifera ◽  
Carbonate Platform ◽  
Planktonic Foraminifera ◽  
Larger Benthic Foraminifera ◽  
Sequence Stratigraphic ◽  
Kopet Dagh ◽  
Sudden Decrease ◽  
Shallow Carbonate Platform

In this paper, the biostratigraphy and sequence stratigraphy of marine Paleogene deposits from the Kopet-Dagh basin (NE of Iran) are described. Particularly the absence of Morozovella genus is discussed. In addition, the Paleocene/Eocene boundary has been studied in detail using the record of planktonic and larger benthic foraminifera. This boundary is located probably within a thin red horizon (~10–15 cm) representing a paleosoil. Close to this boundary is located the base of the calcareous test dissolution interval, with the dominance of agglutinated benthic foraminifera and with a sudden decrease in the richness of benthic foraminiferal species. Biostratigraphic studies led to the identification of 33 genera of larger benthic foraminifera and 5 genera of planktonic foraminifera. Petrographical studies indicate that these sediments, consisting of four carbonate lithofacies (15 subfacies), may have been deposited on a shallow carbonate platform (ramp type). These lithofacies have been deposited in open marine, shoal, lagoon, and tidal flat environmental conditions. Sequence stratigraphic analysis led to the identification of four third-order depositional sequences. The interpreted sea-level curve in the Kopet-Dagh basin can be correlated with Paleocene-Eocene global curves, with a sea-level fall in the latest Paleocene, followed by a sea-level rise in the earliest Eocene.

Benthic foraminifera distribution and diversity in inner and outer lagoonal sediments of the UAE (United Arab Emirates)

2020 ◽  
Author(s):  
Flavia Fiorini ◽  
Stephen W. Lokier ◽  
Yuzhu Ge ◽  
Chelsea L. Pederson ◽  
Adrian Immenhauser
Keyword(s):  
United Arab Emirates ◽  
Benthic Foraminifera ◽  
Ecological Indices ◽  
Foraminiferal Assemblage ◽  
Larger Benthic Foraminifera ◽  
Carbonate Sedimentation ◽  
Abundance And Diversity ◽  
High Diversity ◽  
Agglutinated Foraminifera

<p>Live and dead benthic foraminifera assemblages were studied from 50 samples collected in a lagoon located between Yas Island and Ras al Gurhab Island (UAE) in a system dominated by carbonate sedimentation.</p><p>Living and dead foraminifera tests are present at all of the sampled locations. The foraminifera assemblage is dominated by a high diversity of miliolidae together with epiphytic larger benthic foraminifera belonging to the genera Peneroplis, Spirolina and Sorites. Hyaline foraminifera, such as Ammonia and Elphidium, are commonly found at all the locations while agglutinated foraminifera are uncommon and have a scattered occurrence.</p><p>The abundance and diversity of benthic foraminifera were calculated for each sample. Four benthic foraminifera ecological indices were applied to the studied samples. For each of the samples we calculated: the total foraminiferal number (number of foraminifera in 1 g of sediment >125 μm); the percentages of agglutinated, porcellaneous and hyaline foraminifera tests; the ratio between living and dead benthic foraminifera; the ratio between larger benthic foraminifera with normal and abnormal test growth. The above-mentioned data have been applied to construct a foraminiferal assemblage database that facilitates the discrimination between inner and outer lagoonal environments.</p>

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