Szczegóły publikacji
Opis bibliograficzny
Micropaleontological data from the Upper Jurassic–Lower Cretaceous Chia Gara Formation (northeastern Iraq) – preliminary results / Alaa Al-Wazan, Nisreen Aziz, Ali Al-Juboury, Justyna KOWAL-KASPRZYK, Marina Molčan Matejová, Anna WAŚKOWSKA // Volumina Jurassica / Warsaw University. Faculty of Geology. Institute of Geology ; ISSN 1896-7876 . — Tytuł poprz.: Tomy Jurajskie ; ISSN: 1731-3708. — 2026 — vol. 24, s. 13–29. — Bibliogr. s. 26–28, Abstr. — Publikacja dostępna online od: 2026-05-20
Autorzy (6)
- Al-Wazan Alaa M.
- Aziz Nisreen M.
- Al-Juboury Ali I.
- AGHKowal-Kasprzyk Justyna
- Molčan Matejová Marína
- AGHWaśkowska Anna
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 168073 |
|---|---|
| Data dodania do BaDAP | 2026-06-03 |
| Tekst źródłowy | URL |
| DOI | 10.7306/VJ.24.2 |
| Rok publikacji | 2026 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Volumina Jurassica |
Abstract
The Upper Jurassic–Lower Cretaceous Chia Gara Formation from northeastern Iraq (Surdash and Zeni Warte sections) is composed mainly of shales and limestones. The shales contain phacoid compressional structures in the lower part, while the limestones are rich in ammonites, which are mostly pyritized and oxidized. Poorly preserved microfossils include numerous radiolarians, as well as rare calcareous dinoflagellate cysts, benthic and planktic foraminifera, and – in the upper part of the sections – numerous nannoconids. Calcareous dinocysts, such as Colomisphaera tenuis (Nagy), Colomisphaera lucida Borza, and Colomisphaera cf. heliosphaera (Vogler) confirm the Late Tithonian and Berriasian age of the formation. The planktonic foraminifera Globuligerina bathoniana (Pazdrowa) suggests the (Middle? Upper?) Jurassic age of the lower part of the formation. In the upper part, the presence of Lilliputianella eocretacea (Neagu) and Hedbergella ?handousi (Salaj) confirmes the Early (?) Cretaceous age. The radiolarians obtained represent the Nassellaria order. The first occurrence of Pseudodicytomitra cf. carpatica (Lozyniak) and Holocryptocanium barbui Dumitrica, together with Loopus cf. primitivus (Matsuoka et Yao) and the genus Zhamoidellum confirm the latest Tithonian age in the lower part of the Zeni Warte section. A transition from predominantly clay-rich radiolarian facies to more calcareous nannoconus facies is noted. The presence of pelagic microfossils, along with the lithology, a limited influx of siliciclastic silt, and an absence of coarser siliciclastic materials, indicates that deposition occurred in an open marine, at least a deep shelf, environment.
