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    Wyświetlanie 1-7 z 7
    Tytuł:
    The youngest Devonian record of "Housean pits" in ammonoids
    Autorzy:
    Rakociński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059005.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ammonoids
    parasite
    pearl formation
    "Housean pits"
    Polska
    Upper Devonian
    Opis:
    An unusual occurrence of parasitic "Housean pits" in internal mould of ammonoid specimen referred to as Felisporadoceras cf. subvaricatum (Sobolew) from Middle Famennian of Poland are described. Hitherto the youngest representatives of goniatites showing a pitting on the internal moulds were known from the Middle Devonian (lower Givetian), thus, most probably the presented material constitutes the youngest world record of this phenomenon.
    Źródło:
    Geological Quarterly; 2012, 56, 2; 387-390
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dolnokarboński zapis zdarzeń beztlenowych oraz aktywnooeci wulkanicznej w profilu kamieniołomu Kowala koło Kielc
    Record of Lower Carboniferous anoxic events and volcanic activity in the Kowala Quarry near Kielce
    Autorzy:
    Rakociński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2066174.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    aktywność wulkaniczna
    kamieniołom Kowala
    volcanic activity
    Kowala Quarry
    Źródło:
    Przegląd Geologiczny; 2009, 57, 12; 1046-1047
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zjawisko "zachowania w ukryciu" skamieniałości — przegląd i przykłady z górnego dewonu Polski
    Phenomenon of "sheltered preservation" — an overview and fossil examples from the Upper Devonian of Poland
    Autorzy:
    Rakociński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074704.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    zachowania w ukryciu
    Trylobity
    famen
    dewon
    Góry Świętokrzyskie
    Polska
    "sheltered preservation"
    trilobites
    cephalopods
    Famennian
    Devonian
    Holy Cross Mountains
    Polska
    Opis:
    "Sheltered preservation" of various organisms within shells of cephalopods is a well-known phenomenon and numerous examples have been frequently reported by paleontologists from several regions but so far not from Poland. In the present paper, spectacular examples of such occurrences of different organisms preserved mainly within empty cephalopod shells are reviewed. Moreover, specimens of trilobites representing the genus Cyrtosymbole, found within the phragmocone of a clymeniid ammonoid Kalloclymenia, and disarticulated fragments of trilobites preserved in body chamber of an orthoconic nautiloid are illustrated and shortly described from the Upper Famennian of Kowala (Holy Cross Mountains, Poland).
    Źródło:
    Przegląd Geologiczny; 2009, 57, 7; 584-590
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Framboidy pirytowe jako wskaźniki paleośrodowiska
    Pyrite framboids as paleoenvironmental indicators
    Autorzy:
    Zatoń, M.
    Rakociński, M.
    Marynowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074589.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    framboidy pirytowe
    redoks
    warunki środowiskowe oksyczne
    warunki środowiskowe dysoksyczne
    warunki środowiskowe euksyniczne
    jura
    dewon
    Polska
    pyrite framboids
    redox
    euxinia
    anoxia
    dysoxia
    Jurassic
    Devonian
    Polska
    Opis:
    The problemof application of pyrite framboids in reconstructions of the redox conditions is presented. The characteristics of pyrite framboids, their origin and principles of application in paleoenvironmental interpretations are given. The pyrite framboid diameter distribution as indicators of redox conditions was presented on the examples of the Middle Jurassic (Upper Bajocian-Lower Bathonian) ore-bearing clays of the Polish Jura, and Upper Devonian (Middle and Upper Famennian) dark grey and black shales from Kowala (Holy Cross Mountains). It has been shown, that during the sedimentation of the ore-bearing clays, the pyrite framboids formed in the sediment, below the oxic water column; however, some episodic oscillation around the dysoxic conditions cannot be entirely excluded. During the sedimentation of the Middle Famennian dark grey shales, the redox conditions at the sea-floor oscillated around dysoxia. In both examples, the framboids are characterized by wide range of their diameters and the presence of large, >10 "my"m, framboids. On the contrary, the Upper Famennian black shales, representing the Hangenberg event, were deposited below the euxinic conditions in the water column. It is indicated by a high frequency of small-size framboids, far below 6 "my"m in diameter, and the lack of the large ones. The overlying shales, on the other hand, show the transition to more oxic conditions. The redox conditions interpreted above are in agreement with the independent biomarker analyses and paleontological observations.
    Źródło:
    Przegląd Geologiczny; 2008, 56, 2; 158-164
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anomalous Upper Devonian mercury enrichments : comparison of Inductively Coupled Plasma – Mass Spectrometry (ICP-MS) and Atomic Absorption Spectrometry (AAS) analytical data
    Autorzy:
    Racki, G.
    Rakociński, M.
    Marynowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060451.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Mercury anomalies
    analytical methods
    geochemistry
    Frasnian-Famennian boundary
    Devonian-Carboniferous boundary
    volcanism
    Opis:
    Mercury geochemistry is emerging recently as a hot topic in chemostratigraphical and facies research, owing to the diagnostic character of Hg enrichments as a proxy of volcanic activity (crucial in the context of assumed causal links between volcanic cataclysms and mass extinctions). Thus, as a prerequisite to such far-reaching interpretations, reliable analytical determinations of Hg concentrations are necessary. In conventionally performed analyses in sedimentary geochemistry, Inductively Coupled Plasma – Mass Spectrometry (ICP-MS) is usually applied, as an analytical standard for trace elements, including Hg. However, with a detection limit (DL) of 10 ppb, such measured values have been questioned as a conclusive geochemical indicator of Hg anomalies, and, instead, far more accurate techniques, such as Atomic Absorption Spectrometry (AAS; DL = 0.2 ppb), are requested. As a preliminary test of this view, we present comparative analysis of 91 samples from three sections encompassing the key Frasnian-Famennian and Famennian-Tournaisian boundary intervals in Morocco (Lahmida), Germany (Kahlleite) and Uzbekistan (Novchomok), for which Hg concentrations were determined by both methods in the same samples. Despite some differences, especially at low Hg concentrations, both analytical methods reveal the same 12 extraordinarily enriched samples in excess of 1 ppm (with one exception, the determination error is <20%), as well as similar overall chemostratigraphic patterns characterized by a few prominent Hg spikes, with a top value of 5.8 ppm. The Hg concentrations determined by ICP-MS and AAS are significantly correlated, as high as r = 0.98 (Novchomok), even if the first method reveals a general tendency toward slightly heightened values (by ~15 to 30% for medians). Therefore, ICP-MS results can conclusively be used in mercury chemostratigraphy in order to recognize extraordinary volcanic (or other) signals, at least in the Devonian geological record. False Hg anomalies were not generated by these conventional ICP-MS determinations.
    Źródło:
    Geological Quarterly; 2018, 62, 3; 487--495
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molluscs from the Early Frasnian goniatite level at Kostomloty in the Holy Cross Mountains, Poland
    Autorzy:
    Jagt-Yazykova, E
    Krawczynski, W.
    Rakocinski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/20723.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    mollusc
    Early Frasnian
    Frasnian
    goniatite level
    Kostomloty commune
    Holy Cross Mountains
    Polska
    Devonian
    Goniatitida
    Nautiloida
    Gastropoda
    Bivalvia
    paleoecology
    Acanthoclymenia
    Linguatornoceras
    Koenenites
    new species
    Palaeozygopleura pyritica
    bivalve
    Glyptohallicardia multicostata
    Opis:
    The unique goniatite−rich pyritic level, 1.6 m thick, exposed at Kostomłoty (Holy Cross Mountains, central Poland) represents a distinct, local biotic event in the Early Frasnian interval corresponding to the inception of a major geochemical (carbon cycling) perturbation in the stagnant deep−water and oxygen−deficient Kostomłoty basin. The taxonomic and palaeoecologic characteristics of molluscan fossil associations from the Goniatite Level are presented. Most of the goniatitids and orthoconic nautiloids from the studied fossil assemblages are juvenile conchs or protoconchs, or incomplete phragmocones and represent the genera Acanthoclymenia and Linguatornoceras, the former being predominant, and a single adult specimen probably of the genus Koenenites. In contrast, gastropods and bivalves are generally well preserved and identifiable to species level. Two new species are described: a gastropod Palaeozygopleura (Bohemozyga) pyritica sp. nov. and a bivalve Glyptohallicardia multicostata sp. nov. These studied molluscs and also amphiporoids are allochthonous elements which must have been transported into the deeper settings during sea−level rise and flooding of fringing reefs (Timan Event) and/or storm events, and there were mixed with pelagic cephalopods. Probably, a sea−level rise even led to flooding of nearby areas, and thus to introduction of pelagic material (juvenile cephalopods) into reefal settings, and then back to the deeper water again by the quasi−estuarine circulation of water masses.
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 4; 707-718
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wstępne dane o nagromadzeniu jeżowców z rodzaju Conulus w profilu dolnego turonu Glanowa (niecka miechowska)
    Apreliminary report on echinoid accumulations of the genus Conulus in the Lower Turonian at Glanów of the Miechów Trough - southern Poland.
    Autorzy:
    Borszcz, T.
    Gajerski, A.
    Rakociński, M.
    Szczepańczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074605.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    niecka miechowska
    profil turonu Glanowa
    górna kreda
    turon
    jeżowce
    Conulus
    Salenocidaris
    Miechów Trough
    Glanów section
    Upper Cretaceous
    Turonian
    Echinoids
    Opis:
    An interesting phenomenon of echinoid accumulation occurring in the Lower Turonian (Mytiloides labiatus Zone) at Glanów village (Miechów Upland) is the main topic of the paper. The bed investigated consists of poorly cemented sandy-marly limestones with thickness of about 30 cm. The accumulation of echinoids is older than that of documented in Wielkanoc which is of middleto-late Turonian age and situated in the same region under study. Apart from a dominant echinoid species Conulus subrotundus Mantell represented by adult and juvenile forms that are dispersed in the bed, the second echinoid species -a regular form Salenocidaris granulosa (Woodward)-has also been noted. Additionally, the skeletal elements of crinoids, ophiuroids, asteroids, as well as bryozoans, annelids, poriferans and shark teeth have also been found in the bed under study. Preliminary observations indicate that the origin of the echinoid accumulation corresponds well with the Conulus bed from the Wielkanoc quarry as a result of luxuriant development of echinoids and complex sedimentological, paleoecological and tectonic factors.
    Źródło:
    Przegląd Geologiczny; 2008, 56, 7; 552-556
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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