Keywords : Tanjero

Planktonic Foraminiferal Biostratigraphy of Tanjero Formation (Late Maastrichtian) in Bekhme Area, Northeastern Iraq

Majid Al-Mutwali; Muthana Ibrahim

Iraqi National Journal of Earth Science, 2019, Volume 19, Issue 1, Pages 1-21
DOI: 10.33899/earth.2019.170035

The biostratigraphy of Tanjero Formation has been investigated within a well-
exposed section at the northern limb of Perat anticline, Bekhme area, Northeastern Iraq.
The studied section consists mainly of marl, marly limestone, and sandstone. The
formation conformably overlies Shiranish Formation (Late Campanian-Maastrichtian)
and it is overlain unconformably by the Kolosh Formation (Paleocene). The samples of
the section under investigation yielded rich and well diversified planktonic foraminiferal
taxa, where 69 planktonic species belonging to 21 genera have been recognized. The
detailed foraminiferal investigation permits the recognition of four well defined zones.
These are from older at the base:
4. Plummerita hantkeninoides Total Range Zone.
3. Pseudoguembelina palpebra Partial Range Zone.
2. Pseudoguembelina hariaensis Interval Zone.
1. Racemiguembelina fructicosa Interval Zone.
The Planktonic zones were correlated with other zonal schemes in- and outside
Iraq. They are considered to be of Late Maastrichtian age.

Some Ostracoda Species of Tanjero Formation (Late Campanian- Maastrichtian) of Diana Area, NE Iraq.

Nisreen M. Aziz

Iraqi National Journal of Earth Science, 2018, Volume 18, Issue 1, Pages 27-40
DOI: 10.33899/earth.2018.159270

Eleven ostracode species belonging to eight genera were described and illustrated for the first time from Tanjero Formation (Late Campanian- Maastrichtian) at Diana, North East Iraq, which six species are new: Cytherella suranensis sp. nov.; Cytherella omarians sp. nov.; Bairdia dianaensis sp. nov.; Bythocypris sirwanensis sp. nov.; Bairdoppilata halabijaensis sp. nov. and Limburgina kaniensis sp. nov.:
Cytherella suranensis sp. nov. ; Cytherella omarians sp. nov.; Bairdia dianaensis sp. nov.;Bythocypris sirwanensis sp. nov.; Bairdoppilata halabijaensis sp. nov. and Limburgina kaniensis sp. Nov

Possible Effect of Storm on Sediments of Upper Cretaceous Foreland Basin: A Case Study for Tempestite in Tanjero Formation, Sulaimanyia Area, NE-Iraq

Kamal H. Karim

Iraqi National Journal of Earth Science, 2007, Volume 7, Issue 2, Pages 1-11
DOI: 10.33899/earth.2007.39238

Previously, the basin of Tanjero Formation (Campanian-Maastrichtian) has been given the setting of trench or miogeosyncline in which turbidite sedimentation had occurred. In the present study, conversely, many sedimentary structures are found that shows shallow environment of the lower and upper part of Tanjero Formation.These sedimentary structures revealed that during deposition of these parts the sea level is so lowered that the sediments are affected repeatedly by storms surges. These storms reworked sediments to form storm deposits (Tempestite) or to be transported to deeper water and deposited as turbidite. The recoded sedimentary structures are such as hummocky- cross stratification, interference and longitudinal ripple marks, plant debris
and grass body fossils in addition to clean sandstone (Arenite).

Age of Unconformity within Tanjero Formation in Chwarta Area Northeast of Iraq (Kurdistan Region)

Khalid M. Sharbazheri

Iraqi National Journal of Earth Science, 2007, Volume 7, Issue 1, Pages 37-54
DOI: 10.33899/earth.2007.39402

Th age of the thick succession of 500m conglomerate and red claystone layers in the incised valleys at the lower part of Tanjero Formation at Chwarta area is estimated to be (1.23 m.y) duration. The age determination is achieved by Planktonic Foraminiferal biostratigraphic zonation which included the following Zones: Globotruncana aegyptiaca Interval Zone (CF8), Gansserina gansseri Interval Zone (CF7) Racemiguemblina fructicosa Interval Zone (CF4), Pseudoguembelina hariaensis Interval Zone (CF3) with missing zones of Contusotruncana contusa Interval zone (CF6) and Pseudotextularia intermedia Interval zone (CF5). Twenty six planktonic foraminiferal species and thirty benthonic foraminiferal species assigned to 33 genera have been recorded. The zonal scheme developed here is correlated with other sequences of Li and Keller (1998a) and d
iscussed. e

Analytical Comparison Study Between Khabour and Tanjero Formations Northern Iraq

Kamal H. Karim

Iraqi National Journal of Earth Science, 2006, Volume 6, Issue 2, Pages 1-12
DOI: 10.33899/earth.2006.36358

Tanjero Formation is one of the best studied stratigraphic units and recently shown to be deposited in foreland basin in different shallow and deep environments. Conversely, Khabour Formation is not studied in detail in term of environment, tectonic and sequence stratigraphy. Therefore, the lower part of the former formation assigned as a norm or model for comparison for the latter one. The comparison is achieved concerning the stratification characteristics; types of trace fossils, type of system tracts, type of environments, source area tectonics and their relation with red beds. The result of this comparison revealed that Khabour Formation, in many aspects, is analogous to lower part of Tanjero Formation. The result of the comparison is showed that Khabour Formation is deposited in different environments include fluvial, deltaic, shelf, slope and deep marine. Among these, now, only the sediments of shelf and slope are cropped out. The thick succession of sandstone with interbeds of shale of this formation is deposited in lowstand system tract forming lowstand wedge. The paleocurrent was possibly toward southwest and the basin may be bordered by active fault during Ordovician. The source area was dioritic or gneissoid body which was possibly weathered in wet climate.