Calpionellid biostratigraphy and microfacies of the Upper Tithonian pelagic carbonates in northeastern Serbia (Carpatho–Balkanides)

AbstractThe occurrence of microfossil assemblage represented by calpionellids in close association with benthic foraminifera and encrustingCrescentiella morronensisis reported for the first time from the Upper Tithonian of NE Serbia. The biostratigraphic and sedimentological investigations were carried out on a 250 m thick carbonate succession in Jelenska Stena quarry cropping out along the Danube River Gorge in the border area of Serbian Carpatho–Balkanides and Romanian Southern Carphatians. On the basis of determined benthic foraminiferal taxaTextulariasp. cf.T. bettenstaedtiandEverticyclammina praekelleriin the lower part of the succession and calpionellid association dominated by the representatives of calpionellid generaTintinnopsella, CrassicollariaandCalpionellathe carbonate succession is assigned to the Upper Tithonian. The scarcity of calpionellid zonal species prevents the nominal zones being recognized. Petrographic analysis of thin-sections led to the recognition of three basin microfacies types: bioclastic wackestone, bioclastic peloidal wackestone/packstone and mudstone. These microfacies characterize the SMF 3 and SMF 4 which indicate deposition in slope and toe-of-slope environments. This study extends the palaeogeographical distribution of Upper Tithonian calpionellids along the northern Tethyan margins. The investigated carbonate succession is compared with coeval strata from other northern Tethyan regions.

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The functional significance of the spinose keel structure of benthic foraminifera: inferences from <i>Miliolina cristata</i> Millett, 1898 (Miliolida) from northeast Romania

Journal of Micropalaeontology ◽

10.5194/jm-37-153-2018 ◽

2018 ◽

Vol 37 (1) ◽

pp. 153-166

Author(s):

Simina Dumitriţa Dumitriu ◽

Zofia Dubicka ◽

Viorel Ionesi

Keyword(s):

Sea Level ◽

Benthic Foraminifera ◽

Functional Significance ◽

High Energy ◽

Northwestern Part ◽

Sea Level Changes ◽

Thin Sections ◽

Core Section ◽

First Time ◽

Turbulent Water

Abstract. The paper presents Miocene (lower Sarmatian) benthic foraminifera from the FH3P1 Rădăuţi Core section from the northwestern part of the Moldavian Platform, Romania. Based on foraminiferal assemblages we infer sediments were deposited in shallow-water, including marine-marginal environments, of varying salinities from brackish to normal marine with some short and rather small sea-level changes. Moreover, we describe for the first time in the Moldavian Platform a very rare species, Miliolina cristata Millett, which presents a characteristic spinose keel. Based on a detailed study of the test morphology and its variability, observed in picked material as well as in thin sections, we discuss some palaeoecological aspects of these foraminifera. M. cristata probably does not constitute a distinctive species, but it is more probable that some miliolid taxa developed such an exoskeletal feature in response to new environmental conditions, such as more turbulent water. Accordingly, our study would support the thesis that one of the functions of the benthic foraminiferal spines is to stabilize foraminiferal tests found in sandy substrates from high-energy environments.

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New record of Neogobius fluviatilis (Pallas, 1814) (Gobiidae) in the Danube river basin (Serbia)

Archives of Biological Sciences ◽

10.2298/abs1304469d ◽

2013 ◽

Vol 65 (4) ◽

pp. 1469-1472 ◽

Cited By ~ 1

Author(s):

Vesna Djikanovic ◽

G. Markovic ◽

S. Skoric

Keyword(s):

New Record ◽

Morphological Changes ◽

First Record ◽

Danube River ◽

Sand Goby ◽

The Danube River ◽

Goby Species ◽

Morava River ◽

First Time ◽

Allochthonous Organisms

Recently, the growing colonization of allochthonous organisms in the Serbian section of the Danube River and interconnected ecosystems was observed. Hydro-morphological changes, such as regulations of the watercourse, have made this sector suitable for bio-invasions. Two specimens of Neogobius fluviatilis (Pallas, 1814) (Piscea: Gobidae) were collected on 10 August 2012 from the Zapadna Morava River, below the first dam on the river course. This is the first record of the sand goby in the watercourse in the central part of Serbia, as a tributary of the Danube River. Our findings show that the sand goby has thus far reached not only the main course of the Danube River but its tributary as well. This freshwater fish was observed for the first time in the Serbian part of the Danube River in 1986 in Begej locality (1.276 km). There are five Ponto-Caspian goby species in the waters of Serbia.

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