scholarly journals Calcareous Nannofossil Biostratigraphy and Ostracoda Paleoecology of Hartha Formation from Balad (1) well, Central Iraq

2021 ◽  
pp. 3962-3972
Author(s):  
Omar Ahmed Al-Badrani ◽  
Faris Nejris Hassan ◽  
Mahfoudh Abdulla Al-Hadeedy
Keyword(s):  
Continental Shelf ◽  
Outer Shelf ◽  
Calcareous Nannofossils ◽  
Calcareous Nannofossil ◽  
Inner Shelf ◽  
Calcareous Nannofossil Biostratigraphy ◽  
Stratigraphic Ranges

Seventeen samples of Hartha Formation in Balad (1) well, central Iraq, are studied on the basis of stratigraphic ranges of the recorded calcareous nannofossils for twenty species belonging to twelve genera. The studied section reveals three biozones arranged from oldest to youngest as follows; (1) Calculites ovalis Interval Biozone (CC19), (2) Ceratolithoides aculeus Interval  Biozone (CC20), (3) Quadrum  sissinghii Interval Biozone (CC21). These Biozones are correlated with other calcareous nannofossils biozones from both local and regional sections, leading to conclude the age of the Middle Campanian. Rerecorded eighteen ostracode species that belong to eleven genera are identified, all of which were previously recorded from Iraq and adjacent regions. The occurrence of these species leads to conclude a continental shelf environment, while they are typical of inner shelf-outer shelf depth.

scholarly journals Direct correlation of Tithonian/Berriasian boundary calpionellid and calcareous nannofossil events in the frame of magnetostratigraphy: new results from the West Balkan Mts, Bulgaria, and review of existing data

2017 ◽  
Vol 46 (2) ◽  
pp. 47-56
Author(s):  
Iskra Lakova ◽  
Jacek Grabowski ◽  
Kristalina Stoykova ◽  
Silviya Petrova ◽  
Daniela Reháková ◽  
...  
Keyword(s):  
Magnetic Polarity ◽  
Calcareous Nannofossils ◽  
Calcareous Nannofossil ◽  
The West ◽  
Large Interval ◽  
History Museum ◽  
Specific Behaviour ◽  
Calcareous Nannofossil Biostratigraphy ◽  
Lower Berriasian ◽  
Events Data

Magnetostratigraphy, calpionellid and calcareous nannofossil biostratigraphy of the upper Tithonian and lower Berriasian of section Barlya in the West Balkan Mts are herein presented. The studied interval comprises the magnetozones from M21r to M17r, with a large interval of partial remagnetization. It has been directly correlated with a continuous succession of the calpionellid Chitinoidella, Praetintinnopsella, Crassicollaria and Calpionella zones, and with the nannofossil zones from NJT 15b to NK-1. The accumulated evidence in the last twenty years on the magnetostratigraphy, calpionellid and calcareous nannofossil biostratigraphy and events across the J/K boundary in the European Tethys has provoked the authors to plot the main micropalaeontological events against magnetostratigraphic column in order to assess the extent of diachronism of these events. Data from Slovakia, Poland, Italy, Austria, Hungary, France, Spain and Bulgaria has shown specific behaviour of different calpionellid and nannofossil events with respect to the column of the magnetic polarity chrons, which have been considered as ‘isochronous’ or at least less diachronous than the microfossil events. Thus, some rather consistent events have appeared, such as the first occurrences (FOs) of calpionellids Calpionella grandalpina, Crassicollaria brevis, Calpionella minuta and Remaniella ferasini, and the FOs of calcareous nannofossils Nannoconus globulus minor, Hexalithus geometricus, Nannoconus wintereri, Nannoconus steinmannii minor and Nannoconus kamptneri minor. The J/K boundary, as widely accepted, has been traced in section Barlya at the base of the Calpionella alpina Subzone.Financial support from the Synthesys Program at the National History Museum, Stockholm, is gratefully acknowledged.

scholarly journals Upper Eocene planktonic foraminifera from northern Saudi Arabia: implications for stratigraphic ranges

2021 ◽  
Vol 40 (2) ◽  
pp. 145-161
Author(s):  
Bridget S. Wade ◽  
Mohammed H. Aljahdali ◽  
Yahya A. Mufrreh ◽  
Abdullah M. Memesh ◽  
Salih A. AlSoubhi ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Planktonic Foraminifera ◽  
Late Eocene ◽  
Calcareous Nannofossil ◽  
Upper Eocene ◽  
Calcareous Nannofossil Biostratigraphy ◽  
Stratigraphic Ranges ◽  
Latest Eocene ◽  
Stratigraphic Range

Abstract. The Rashrashiyah Formation of the Sirhan Basin in northern Saudi Arabia contains diverse assemblages of planktonic foraminifera. We examined the biostratigraphy, stratigraphic range and preservation of upper Eocene planktonic foraminifera. Assemblages are well-preserved and diverse, with 40 species and 11 genera. All samples are assigned to the Priabonian Globigerinatheka semiinvoluta Highest Occurrence Zone (E14), consistent with calcareous nannofossil biostratigraphy indicating Zone CNE17. Well-preserved planktonic foraminifera assemblages from the lower part of the upper Eocene are rare worldwide. Our study provides new insights into the stratigraphic ranges of many species. We find older (Zone E14) stratigraphic occurrences of several species of Globoturborotalita previously thought to have evolved in the latest Eocene (Zone E15, E16) or Oligocene; these include G. barbula, G. cancellata, G. gnaucki, G. pseudopraebulloides, and G. paracancellata. Older stratigraphic occurrences for Dentoglobigerina taci and Subbotina projecta are also found, and Globigerinatheka kugleri occurs at a younger stratigraphic level than previously proposed. Our revisions to stratigraphic ranges indicate that the late Eocene had a higher tropical–subtropical diversity of planktonic foraminifera than hitherto reported.

scholarly journals The Depositional Environments in the Cilento Offshore (Southern Tyrrhenian Sea, Italy) Based on Marine Geological Data

2021 ◽  
Vol 9 (10) ◽  
pp. 1083
Author(s):  
Gemma Aiello ◽  
Mauro Caccavale
Keyword(s):  
Continental Shelf ◽  
Late Quaternary ◽  
Depositional Environments ◽  
Geological Mapping ◽  
Outer Shelf ◽  
Tyrrhenian Sea ◽  
Outer Continental Shelf ◽  
Inner Shelf ◽  
Depositional Sequence ◽  
System Tract

The depositional environments offshore of the Cilento Promontory have been reconstructed based on the geological studies performed in the frame of the marine geological mapping of the geological sheet n. 502 “Agropoli”. The littoral environment (toe-of-coastal cliff deposits and submerged beach deposits), the inner continental shelf environment (inner shelf deposits and bioclastic deposits), the outer continental shelf environment (outer shelf deposits and bioclastic deposits), the lowstand system tract and the Pleistocene relict marine units have been singled out. The littoral, inner shelf and outer shelf environments have been interpreted as the highstand system tract of the Late Quaternary depositional sequence. This sequence overlies the Cenozoic substratum (ssi unit), composed of Cenozoic siliciclastic rocks, genetically related with the Cilento Flysch. On the inner shelf four main seismo-stratigraphic units, overlying the undifferentiated acoustic basement have been recognized based on the geological interpretation of seismic profiles. On the outer shelf, palimpsest deposits of emerged to submerged beach and forming elongated dunes have been recognized on sub-bottom profiles and calibrated with gravity core data collected in previous papers. The sedimentological analysis of sea bottom samples has shown the occurrence of several grain sizes occurring in this portion of the Cilento offshore.

scholarly journals Stratigraphic and Microfacies Study of Kometan Formation (Upper Turonian-Lower Campanian), in the Dokan area, Northern Iraq

2021 ◽  
Vol 54 (1F) ◽  
pp. 51-68
Author(s):  
Zaid A. Malak
Keyword(s):  
Sedimentary Environment ◽  
Middle Part ◽  
Outer Shelf ◽  
Calcareous Nannofossils ◽  
Dolomitic Limestone ◽  
Kurdistan Region ◽  
Northern Iraq ◽  
Stratigraphic Ranges ◽  
Unconformable Contact ◽  
Lower Campanian

The Kometan Formation is widely distributed in the northern (Kurdistan region) and central Iraq. The studied area is located near the Dokan Dam, about 58 km., to the Northwest of the Sulaymaniyah city, Northeastern Iraq. The Kometan Formation is exposed on the southwest flank of the Sarah anticline. The formation consists of limestone and dolomitic limestone, which have cherts nodules throughout the formation. The Gulneri Formation is recorded below the Kometan Formation with unconformable contact, while at the top is bounded by the Shiranish Formation unconformably too. Three microfacies are identified, these are lime mudstone, planktic foraminiferal lime wackestone-packstone, keeld planktonic foraminiferal lime wackestone-packstone microfacies. All the sedimentary and fossil evidence refer that the sedimentary environment of the formation is the outer shelf to upper bathyal at the lower and upper parts of formation and its extension to the middle bathyal in the middle part of the formation. Based on the stratigraphic ranges of the recorded Calcareous nannofossils biozones, the age of the Kometan Formation at Dokan area is Late Turonian-Early Campanian.

Earliest Miocene calcareous nannofossil biostratigraphy from the low-latitude Pisco Basin (Peru)

Stratigraphy ◽  
2019 ◽  
Vol 16 (2) ◽  
pp. 87-105
Author(s):  
Emilia R. Belia ◽  
Kevin E. Nick ◽  
Erika Bedoya Agudelo ◽  
David K. Watkins
Keyword(s):  
Calcareous Nannofossil ◽  
Low Latitude ◽  
Calcareous Nannofossil Biostratigraphy

Microfacies analysis, planktonic foraminifera, and calcareous nannofossil biostratigraphy in the Campanian sequences, Kurdistan region, NE Iraq

2021 ◽  
Vol 14 (2) ◽  
Author(s):  
Sawsan Hameed Al-Hazaa ◽  
Rawand Bakir Noori Jaff ◽  
Fadhil Ahmed Ameen Lawa ◽  
Azam Mahanipour ◽  
Khaled Al-Kahtany
Keyword(s):  
Planktonic Foraminifera ◽  
Microfacies Analysis ◽  
Kurdistan Region ◽  
Calcareous Nannofossil ◽  
Calcareous Nannofossil Biostratigraphy
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