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Early Badenian transgression on the outer flank of Western Carpathian Foredeep, Hluchov area, Czech Republic

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Hladilová Š. , Nehyba S. , Zágoršek K. , Tomanová-Petrová P. , Bitner M. A. , Demeny A.

2014

tom Vol. 84, No. 3

259--279

This multidisciplinary study, based on borehole cores from the Hluchov area in Czech Republic, documents an early Badenian marine transgression on the outer flank of the Western Carpathian Foredeep. The shallow-marine deposits represent coastal transgression over a terrestrial topography of weathered pre-Cenozoic bedrock. The lower facies association (FA1) consists of siliciclastic sediment derived from local substrate erosion. Facies indicate a wave-dominated environment with unstable bottom, variable rate of sediment supply and an incremental rise of relative sea level. The upper facies association (FA2) consists of carbonates indicating a major landward shift of shoreline, decline in siliciclastic input and further sea-level rise. The succession represents a transgressive to highstand systems tract. The maximum flooding surface, ca. 1 m above the FA1/FA2 boundary, is signified by an anomalous decrease in K and Th, an increased Th/K ratio and highest U concentration. The heavy-mineral assemblages in FA1 confirm local sediment provenance, whereas those in FA2 indicate broader sediment derivation, including volcanic component from contemporaneous rhyolitic to rhyodacitic eruptions. The deposits contain a wide range of marine fauna, with the foraminifers and molluscs indicating an early Badenian age. Molluscs, bryozoans and echinoderms indicate a normal-salinity environment with a decreasing hydraulic energy. Foraminifers indicate salinity fluctuations in the lowest part of the succession. The isotopic composition of mollusc shells shows marked inter-species differences and a general negative shift in the δ13C and δ18O values, indicating diagenetic alteration. The impact of diagenetic processes appears to have been controlled by sedimentary facies. The highly negative δ13C and δ18O values correspond to sediment layers with the highest Th/K ratios and hence low clay content. Sediment permeability was thus probably crucial in controlling the differential circulation and impact of diagenetic fluids.

The Paleozoic formations of the Al-Qassim Province in Saudi Arabia as potential sites for geotourism

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Kaminski M. A. , Garrison T. F. , Yoder C. E.

2019

tom nr 3-4 (58-59)

3--15

The Paleozoic formations in the Middle East contain some of the world’s richest petroleum deposits, as they include excellent source and reservoir rocks. The Paleozoic rocks were deposited on the northern continental shelf of the Gondwanan continent at relatively high latitudes, and provide evidence of the Late Ordovician glacial event and associated sea-level changes. They also contain unique fossil remains. The Paleozoic formations exposed in the Al-Qassim Province in Saudi Arabia are well-suited to become important sites for geotourism. Because the sedimentary formations are well-exposed and are easily accessible, they have strong capacity for development as tourist destinations. In this paper, we describe eight localities and their significance as potential educational sites for geology and palaeontology, as well as the archeological and economic significance of the Paleozoic formations of Saudi Arabia. The cultural and tourist infrastructure is summarised and a two-day field excursion is proposed.

Utwory paleozoiku na Bliskim Wschodzie reprezentowane są zarówno przez skały macierzyste, jak i zbiornikowe, dlatego zawierają bogate złoża ropy naftowej. Zostały one zdeponowane na kontynentalnym szelfie Gondwany w chłodnym klimacie i wykazują ślady warunków glacjalnych i zmian poziomu morza związanych z glacjacją. Występują w nich także unikalne skamieniałości. Formacje paleozoiku w prowincji Al-Qassim w Arabii Saudyjskiej mają duży potencjał dla geoturystyki. Ponieważ są one łatwo dostępne i dobrze odsłonięte, mogą służyć jako ciekawe atrakcje turystyczne. W niniejszej pracy opisano osiem obiektów geoturystycznych, przedstawiając ich geologiczną (w tym paleontologiczną) charakterystykę wraz z ekonomicznym znaczeniem badanych formacji. Proponując dwudniową wycieczkę terenową po utworach paleozoiku, wskazano także dwa obiekty archeologiczne. Omówiono również infrastrukturę kulturalną i turystyczną.

Summary of a decade of research at the Owadów–Brzezinki Lagerstätte (Tithonian, central Poland): A review and perspectives for the future

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Błażejowski B. , Weryński Ł. , Wierzbowski A. , Michalska M. , Hryniewicz K. , Uchman A. , Kugler S. , Bącal P. , Hołda-Michalska A.

2023

tom Vol. 21

83--98

For over ten years, the Lower to Upper Tithonian boundary beds cropping out in the Owadów–Brzezinki quarry have yielded numerous fossils of ammonites, bivalves, brachiopods, xiphosurans, decapods, insects, and vertebrates – including actinopterygian fishes and various reptiles and others, all of which exhibit fine preservation of their anatomical details due to special environmental conditions during their fossilization. The Owadów–Brzezinki section is also important for stratigraphical correlations because it contains ammonite faunas indicative of the NE European and NW European Subboreal zonal schemes, as well as Tethyan calpionellids. The whole faunal as- semblage, which represents taxa of many iconic groups of Mesozoic animals, has created the opportunity to establish the ‘Owadów– Brzezinki geopark’, a geoeducation area where the public, and especially the young, can learn about the beauty of the natural history of the region.