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GeoRef Categories
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Availability
Skloby Formation
Figure 2. Lithologic sections of the Lower–Middle Hettangian deltaic deposi... Available to Purchase
WIDESPREAD UPPER TRIASSIC TO LOWER JURASSIC WILDFIRE RECORDS FROM POLAND: EVIDENCE FROM CHARCOAL AND PYROLYTIC POLYCYCLIC AROMATIC HYDROCARBONS Available to Purchase
Gastropod egg capsules preserved on bivalve shells from the Lower Jurassic (Hettangian) of Poland Available to Purchase
Identification of chitin in 200-million-year-old gastropod egg capsules Available to Purchase
Sedimentological, palynological and geochemical studies of the terrestrial Triassic–Jurassic boundary in northwestern Poland Available to Purchase
Dinosaur tracks in a Cretaceous (lower Albian) braid delta system (Basque–Cantabrian Basin, western Pyrenees): linking trace fossils suites and short-term preservation windows Available to Purchase
Abstract Albian dinosaur tracks from the Monte Grande Formation (Basque–Cantabrian Basin) are described. Sedimentary succession shows seven different facies associations (FAs) with four track-bearing levels (levels 1–4) of a braid delta system. FA 4, a proximal crevasse subdelta, preserves in levels 2 and 3 theropod, possibly sauropod and undetermined dinosaur tracks, as well as Ophiomorpha and Skolithos traces. FA 5, a middle crevasse subdelta, presents undetermined cross-section tracks in levels 1 and 4, besides Ophiomorpha , Skolithos and locally Teichichnus in other layers. Both FAs have the same general ichnoassociation, although with preservational variations. The sedimentary succession represents an area with periods of crevasse subdelta progradation and colonization of opportunistic organisms, and other periods of subdelta abandonment represented by short sedimentary hiatuses in which the water sheet would be shallow or even absent and where dinosaurs would be roaming. Particularly, the traces of levels 2 and 3 represent the same ichnocoenosis constituting two different suites and may be envisaged as penecontemporaneous, produced within a short-term preservational window. This tracksite is one of the scarce Albian dinosaur ichnological records in the southwestern European island palaeoarchipelago and one of the few worldwide localities where Albian dinosaur tracks have been found in deltaic facies.
Jurassic Available to Purchase
Abstract The Jurassic System (199.6-145.5 Ma; Gradstein et al. 2004 ), the second of three systems constituting the Mesozoic era, was established in Central Europe about 200 years ago. It takes its name from the Jura Mountains of eastern France and northernmost Switzerland. The term ‘Jura Kalkstein’ was introduced by Alexander von Humboldt as early as 1799 to describe a series of carbonate shelf deposits exposed in the Jura mountains. Alexander Brongniart (1829) first used the term ‘Jurassique', while Leopold von Buch (1839) established a three-fold subdivision for the Jurassic (Lias, Dogger, Malm). This three-fold subdivision (which also uses the terms black Jura, brown Jura, white Jura) remained until recent times as three series (Lower, Middle, Upper Jurassic), although the respective boundaries have been grossly redefined. The immense wealth of fossils, particularly ammonites, in the Jurassic strata of Britain, France, Germany and Switzerland was an inspiration for the development of modern concepts of biostratigraphy, chronostratigraphy, correlation and palaeogeography. In a series of works, Alcide d'Orbigny (1842-51, 1852) distinguished stages of which seven are used today (although none of them has retained its original strati graphic range). Albert Oppel (1856-1858) developed a sequence of such divisions for the entire Jurassic System, crucially using the units in the sense of time divisions. During the nineteenth and twentieth centuries many additional stage names were proposed - more than 120 were listed by Arkell (1956) . It is due to Arkell's influence that most of these have been abandoned and the table of current stages for the Jurassic (comprising 11 internationally accepted stages, grouped into three series) shows only two changes from that used by Arkell: separation of the Aalenian from the lower Bajocian was accepted by international agreement during the second Luxembourg Jurassic Colloquium in 1967, and the Tithonian was accepted as the Global Standard for the uppermost stage in preference to Portlandian and Volgian by vote of the Jurassic Subcommission ( Morton 1974 , 2005 ). As a result, the international hierarchical subdivision of the Jurassic System into series and stages has been stable for many years.
Palaeogeographical evolution of the Lower Jurassic: high-resolution biostratigraphy and sequence stratigraphy in the Central European Basin Available to Purchase
Abstract Basin-scale stratigraphic correlation is the fundamental base for successful reservoir exploration, and especially when dealing with cross-border areas. Differences in lithostratigraphic and chronostratigraphic nomenclature between sub-basins and countries often result in problematic estimations of reservoir geometries and potential. This study combines available biostratigraphic, biofaunal and lithofacies data, together with sequence-stratigraphical correlations of the Lower Jurassic from the Central European Basin (CEB), to propose a genetic-based framework of transgressive and regressive depositional units. The determination of four major biofacies environments, composed of (I) polyhaline open-marine/offshore environments, (II) upper mesohaline marine–brackish environments, (III) lower mesohaline brackish environments and (IV) low oligohaline to freshwater continental environments comprising very rare marine phytoplankton and terrestrial spores and pollens, were translated into 12 biofacies reconstructions of ammonite (sub-) chronozone levels. Variations of biofacies reconstructions in time and space were supplemented by biostratigraphically constrained large-scale progradational and retrogradational sedimentary architecture. Retrogradation is accompanied by increasing polyhaline environments and pinpoint basinwide third-order flooding events, whereas progradation is accompanied by decreasing polyhaline environments pointing to third-order regressions. The outcomes of this study support exploration of Lower Jurassic deep geothermal reservoirs or CO 2 storage sites in the eastern CEB (especially Germany and Poland). Supplementary material: A list of all documented Liassic ammonites known from the eastern European shelf area (Denmark, The Netherlands, Sweden, Germany, Poland; wells and outcrops) is available at https://doi.org/10.6084/m9.figshare.c.3923467