Biostratigraphy of Albian Santonian Succession Along Surdash to Shaqlawa Areas NE Iraq (original) (raw)
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Paleoecology of Albian – Santonian succession of Surdash to Shaqlawa area, NE Iraq
Iraqi Journal of Science, 2015
Three formations to be studied along Surdash, Qallat, Khalakan, Hezob, Sektan, Degala and Shaqlawa areas in the Sulaimaniya and Erbil governorates, NE Iraq. These are: Dokan, Gulneri and Kometan formations. The paleoecology and depositional environment of these formations are determined by studying the ecology of the planktonic and benthic foraminifera. The depositional environment of are ranged from the continental shelf to the abyssal, and the paleotemperature, salinity and paleoclimate were discriminated in each section along the study area.
المجلة العراقية الوطنية لعلوم الارض, 2018
The biostratigraphy of Balambo Formation has been investigated within a well-exposed section at the northeastern limb of Zozik anticline, near Barsarin Village, northeastern Iraq. The studied section consists mainly of marl, marly limestone and limestone. These rocks yielded moderately diversified planktonic foraminiferal fauna and radiolarian skeletons, in addition to some benthonic foraminifera and bioclast. The study is focusing on planktonic foraminiferal taxa, which are classified to ten species belonging to three genera. the stratigraphic distribution of the recorded species permits the recognition of five well defined biozones. These are in descending order:. Globigerinelloides algeriana Taxon range Zone. (part). Globigerinelloides ferreolensis Interval Zone.. Globigerinelloides blowi Interval Zone.. Hedbergella sigali Interval Zone.. Globuligerina hoterivica Interval Zone. The planktonic foraminiferal biozones are correlated with other zonal schemes. They are considered to be extending from Late Valanginian to Late Aptian age.
IRAQI BULLETIN OF GEOLOGY AND MINING (IBGM)\, 2023
Upper Albian and Lower Cenomanian biostratigraphy and microfacies types of the Mauddud Formation from Musaiyib well No.1, Central Iraq are described and examined, which consists of thick to medium bedded limestone, marly limestone rich in argillaceous material, green shale, and dolomitic limestone beds. Thirty-six species from twenty-two genera of benthic foraminifera in addition to calcareous algae, coral, bivalves, gastropods, rudist fragments, brachiopods, bryozoan, and echinoid fragments are recognized from the Mauddud Formation of the studied well. On the basis of the recognized benthic foraminifera three biozones were determined: Mesorbitolina texana-Orbitolina qatarica Concurrent Range zone-Orbitolina sefini-Total R. Zone and Orbtolina concava Total R. Zone. Both suggest the Late Albian-Early Cenomanian age. The results of this study are compared with the work of others inside and outside Iraq. Based on the petrographical analyses, four major microfacies (Mudstone, wackestone, wackestone to packstone, and packstone), and nine sub-microfacies were identified. The Mauddud Formation was formed in a marine environment that was composed of the following three sub-environments: the inner ramp and the middle to the outer ramp.
Iraqi Bulletin of Geology and Mining, 2011
The studied area is located within the High Folded Zone in Dokan area, northeastern Iraq. The Cretaceous/ Paleogene boundary consists of flysch clastic beds of Tanjero and Kolosh formations, interbedded with marl. The study is achieved on the outcrops of the uppermost part of the Late Cretaceous successions (upper part of Tanjero Formation) and the Early Paleogene (lowermost part of Kolosh Formation). Based on identified planktonic foraminiferal assemblages, five biozones were recorded from the upper part of the Tanjero Formation, these zones are from bottom to top: Pseudotextularia intermedia Interval Zone (CF5), Racemiguembelina fructicosa Interval Zone (CF4), Pseudoguembelina hariaensis Interval Zone (CF3), Pseudoguembelina palpebra Interval Zone (CF2), Plummerita hantkeninoides Total Range Zone (CF1) and two biozones were recorded from the lower part of Kolosh Formation, which are: (P1a) Parvularugoglobigerina eugubina-Subbotina triloculinoides Interval Zone and (P1b) Subbotina triloculinoides-Globanomalina compressa/ Praemurica inconstans Interval Zone. The result of the present study (in contrast to previous studies) shows that the Early Danian is found for the first time in the sediments of the Kolosh Formation. It is possible that the other two zones: P 0 (Guembelitria cretacea Zone), and Pα (Parvularugoglobigerina eugubina Zone) were not recorded completely or continuously in the studied area. The biostratigraphic correlations; based on planktonic foraminiferal zonations showed a comparison between the biostratigraphic zones, which were established in this study with other equivalents of the commonly used planktonic zonal scheme around the Cretaceous/ Paleogene boundary, in and outside Iraq.
Iraqi National Journal of Earth Sciences, 2008
The Balambo Formation (Lower Cretaceous), exposed on Jebel Azmer in Sulaimaniya area northeastern Iraq, consists mainly of well bedded hard limestone. Outcrop of 224 m of the upper part of the Balambo Formation are well exposed on the surface with a steeply dipping angle. Planktonic foraminifera represent the major microfossil assemblage of the Balambo Formation. Nineteen cosmopolitan planktonic foraminiferal species were recorded from 92 samples. The identified planktonic foraminifera are of typical Tethyan character. Biostratigraphically the exposed part of the Balambo Formation is defined by four zones and two subzones, these are in ascending chronological order: Ticinella primula Zone, Biticinella breggiensis Zone which is divided into two subzones (Ticinella praeticinensis and Rotalipora subticinensis Subzones), Rotalipora ticinensis Zone and Rotalipora appenninica Zone. Accordingly the age of the Balambo Formation in Jebel Azmer is Middle-Late Albian. The presence of a major hiatus at the end of the Rotalipora appenninica Zone delineates the upper boundary of the formation in the studied section.
Biostratigraphy of the Upper Cretaceous for selected sections in northern Iraq
2019
The Aqra - Bekhme, Shiranish, Tanjero and Kolosh formations outcrop in the High Folded Zone, Northern Iraq in Erbil and Sulaymaniyah governorates. The formations have been studied at two selected geological sections (Bekhme Gorge and Zarda Bee). In this study, these formations are investigated based on both benthic and planktonic foraminifera. Depending on foraminifer’s investigation, three biozones have been recognized; two biozones are identified in the benthic foraminifera and the third one is identified in the planktonic foraminifera as follow: Siderolites calcitropodes - Orbitoides apiculatus - Omphalocyclus macroporus Assemblage zone. Loftusia morgani range zone. Abathomphalus mayaroensis rangezone.
Iraqi Journal of Science
Age and paleoenvironment of part of the Damlouk Member, Ratga Formation from a surface section in the Iraqi Western Desert are investigated. Twenty-nine species of Larger Benthic Foraminifera (LBF) belonging to 13 genera are recognized from the studied section. The LBF assemblage is dominated by the following groups, Nummulites, Alveolina, Rotalia, and Lockhartia. Two species of corals with fragments of bryozoan, red algae and mollusca had also been identified. The palaeontological investigation aimed at identification of LBF assemblages to evaluate their abundance and distribution with respect to sedimentary environment and to determine its age. Based on the recognized Larger Benthic Foraminifera of the studied part of the Damlouk Member, it is subdivided into two biozones: Nummulites gizhensis -Nummulites moculatus Assemblage Zone and Assilina spira- Lokharatia hunti Concurrent Range Zone. Both biozones suggest a Middle - Late Lutetian to Early Bartonian age. The LBF ...
Geologica Carpathica, 2009
The Cretaceous/Tertiary (K/T) boundary sequence, which crops out in the studied area is located within the High Folded Zone, in the Sirwan Valley, northeastern Iraq. These units mainly consist of flysch and flysch-type successions of thick clastic beds of Tanjero/Kolosh Formations. A detailed lithostratigraphic study is achieved on the outcropping uppermost part of the Upper Cretaceous successions (upper part of Tanjero Formation) and the lowermost part of the Kolosh Formation. On the basis of the identified planktonic foraminiferal assemblages, five biozones are recorded from the uppermost part of Tanjero Formation and four biozones from the lower part of the Kolosh Formation (Lower Paleocene) in the Sirwan section. The biostratigraphic correlations based on planktonic foraminiferal zonations showed a comparison between the biostratigraphic zones established in this study and other equivalents of the commonly used planktonic zonal scheme around the Cretaceous/Tertiary boundary in and outside Iraq.
Kirkuk University Journal-Scientific Studies
The current work focuses to study the foraminifera assemblages within the Cretaceous/Paleogene (K/PG) boundary outcropped in the High Folded Zone in Smaquli valley (Gali section), Kurdistan Region, and Northeastern Iraq. The boundary is nearly located between Tanjero and Kolosh Formations and their exposure mainly consists of thick succession of deep marine turbidities (flysch) and hemipelagic sediments. The study aims to indicate biological fossils assemblages and physical expressions that inherited from globally important events of the end of cretaceous. The study has extraited expressions of the well exposed successions of fine grains from which 8 biozones are identified in the uppermost section of Shiranish formation, the Shiranish-Tanjero transition area and the Tanjero formation through biostratigraphy (biozonation) and lithostratigraphic analyses. These zones, from the bottom to top, are upper part of Globotruncana aegyptiaca Interval Zone (CF8), which belongs to Upper part of Shiranish Formation, (Early Maastrichtian) and lower part of Tanjero Formation. The second, third, fourth and fifth zones are Gansserina gansseri Interval Zone (CF7), Contusotruncana contusa Interval Zone (CF6) (Early Maastrichtian) and Pseudotextularia intermedia Interval Zone (CF5), Racemiguembelina fructicosa Interval
Iraqi National Journal of Earth Sciences, 2021
The basinal part of the Damlouk Member upper sedimentary cycle of the Ratga Formation exposed in the Qaim area of the Iraqi western desert is examined. The studied section consists of marlstone, marly and phosphatic limestone, and planktic foraminiferarich limestone beds. Detailed study of the planktic foraminiferal assemblages of these rocks revealed the occurrences of (30) species belonging to (11) genera. The stratigraphic distribution of these species permits the recognition of three biozones. These are from the lower to upper part of the section:-Acarinina bullbrooki Zone, (Middle Lutetian), Morozovelloides lehneri Zone, (Late Lutetian), Globigerinatheca semiinvoluta-Hantkenina alabamensis Zone, (Early Bartonian). These zones indicate that the studied section of the Ratga Formation (Damlouk Member) is of Middle-Late Lutetian to Early Bartonian age. These biozones are correlated with different local and regional studies.