Micropaleontological data from the Upper Jurassic–Lower Cretaceous Chia Gara Formation (northeastern Iraq) – preliminary results
Keywords:
Arabian Plate, open marine, biostratigraphy, radiolarians, calcareous dinocysts, calpionellids, foraminiferaAbstract
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.Downloads
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