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    Wyświetlanie 1-6 z 6
    Tytuł:
    Construction of ichnogeneric names
    Autorzy:
    Rindsberg, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/191214.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    ichnology
    trace fossils
    ichnotaxonomy
    terminology
    Opis:
    Ichnologists have over used the root ichn- “trace”, employing it in new terms and new ichnogenera alike, to the point where it can be difficult to express one self clearly without using it several times in one sentence. The root derives from Ancient iχνος (ichnos), which means “foot print” or “track”, or by extension a “trace”, any sign of an animal’s activity. Perhaps it is time to explore the use of other roots to create new ichnologic terms and genera. Alternative Latin and Greek roots are given here, as well as ad vice on how to construct new ichnogenera in a technically correct and aesthetically pleasing manner.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2015, 85, 3; 529-549
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ichnotaxonomy as a science
    Autorzy:
    Rindsberg, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/191834.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    taxonomy
    ichnotaxobases
    trace fossils
    ichnology
    standardized classification
    Opis:
    If ichnotaxonomy is to be scientific, then its results must be repeatable. While some ichnotaxa are identified consistently, others are not, suggesting that ichnotaxonomy is not a mature science. When researchers disagree on the identification of a specimen, it suggests that closer examination is needed: an intermediate stage in the scientific method. But when ichnologists publish different names for the same trace fossils, multiple trials of classification have yielded different results, suggesting a failure of the hypotheses that led to the names. The burgeoning of invertebrate ichnology from the 1960s onward was made possible by demonstrating its utility to the petroleum industry; in part, this was accomplished by simplifying the ichnotaxonomy of common trace fossils to the point where a specialist was not required to make use of them in sedimentology and stratigraphy. The biological aspect of trace fossils, albeit of great interest, was downplayed in favour of a severely geometric approach. Ironically, this has had the effect of obscuring basic relationships of trace fossils and their palaeoenvironments that could be of great use to sedimentologists. Previous researchers have emphasized the value of a uniform approach in ichnotaxonomy. To accomplish this, ichnologists should take inspiration from the taxonomy of body fossils. Making ichnotaxonomy more replicable will take time and effort among investigators. In the long run, this can be accomplished by a holistic approach that includes close observation of trace fossils, standardized procedures of description and diagnosis, reinvestigation of type material, attention to bioprint (morphological traits that reveal the anatomical and ethological characteristics of the tracemakers; Rindsberg and Kopaska-Merkel, 2005), avoidance of taphonomic and human bias, and above all, cooperation.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2018, 88, 2; 91-110
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A mixed assemblage of deep-sea and shelf trace fossils from the Lower Cretaceous (Valanginian) Kamchia Formation in the Troyan region, central Fore-Balkan, Bulgaria
    Autorzy:
    Uchman, A.
    Tchoumatchenco, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/973639.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    trace fossils
    ichnology
    Lower Cretaceous
    Fore-Balkan
    Bulgaria
    Opis:
    Trace fossils collected from the best outcrop of the Kamchia Formation have been analysed. There are thirteen ichnotaxa (Curvolithus simplex, Gyrochorte isp., ?Helminthoidichnites tenuis, Multina minima [second occurrence], Palaeophycus tubularis, ?Palaeophycus isp., Phycodes bilix, Phycosiphon incertum, Planolites cf. reinecki, Spongeliomorpha ?chevronensis, Squamodictyon tectiforme, Thalassinoides suevicus, Zoophycos isp.) representing different ethologic, toponomic and preservational types, and produced at different depths in the sediment. The ichnoassemblage contains a mixture of forms typical of flysch (Squamodictyon) and shelf deposits (Curvolithus, Gyrochorte). Probably, sediments of the Kamchia Formation were deposited in an offshore or deeper basin with storm deposition of sand beds and background marly sedimentation. It is possible that storm currents transported trace makers of the shelf trace fossils to the deeper sea. It is not excluded that the trace maker of Gyrochorte migrated to the deep-sea after the Jurassic. However, the simplest explanation is that the Kamchia ichnofauna represents an ecological transition between shelf and slope communities.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2003, 73, No 1; 27-34
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trace fossils and depositional environments of the middle Turonian sandstones in the Upper Nysa Kłodzka Graben (Sudetes, Poland) revisited
    Autorzy:
    Chrząstek, Alina
    Nowicka, Nadia
    Powiązania:
    https://bibliotekanauki.pl/articles/2058734.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ichnology
    trace fossils
    Upper Cretaceous
    Sudetes
    palaeoenvironment
    shoreface
    Opis:
    We provide the first reports of some rare trace fossils from the middle Turonian (Upper Cretaceous) of the Sudety Mountains (SW Poland, Upper Nysa Kłodzka Graben, Długopole Górne Quarry). These include burrows ?Ancorichnus isp., Asterosoma cf. ludwigae Schlirf, 2000, Asterosoma isp., cf. Phycodes isp., Dactyloidites ottoi (Geinitz, 1849), Funalichnus strangulatus (Fritsch, 1883), Phycodes cf. palmatus Hall, 1852, cf. Phycodes, Phycosiphon incertum Fischer-Ooster, 1858, ?Phycosiphon isp., Planolites beverleyensis (Billings, 1862) and borings Entobia isp. Some body fossils, bivalves ?Brachidontes sp., Lima canalifera Goldfuss, 1836, Pinna (Pinna) cretacea (Schlotheim, 1813) and Rhynchostreon suborbiculatum (Lamarck, 1801) are also reported. The trace fossil assemblage indicates a distal Skolithos ichnofacies and proximal Cruziana ichnofacies, which characterize a proximal and distal lower shoreface setting respectively. Sedimentation of the middle Turonian sandstones took place in a shallow epicontinental sea of normal salinity and a soft substrate, which was well-oxygenated under low-moderate hydrodynamic conditions. The presence of the oyster Rhynchostreon in the deposits studied suggests the influence of a warm Tethys Ocean.
    Źródło:
    Geological Quarterly; 2021, 65, 1; 10
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ichnofossil assemblages and palaeosols of the Upper Triassic Chinle Formation, south-eastern Utah (USA): Implications for depositional controls and palaeoclimate
    Autorzy:
    Fischer, J. S.
    Hasiotis, S. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/973435.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    continental
    trace fossils
    groundwater profile
    ichnology
    ichnocoenoses
    ichnopedofacies
    Mesozoic
    Opis:
    The Upper Triassic Chinle Formation in the Stevens Canyon area in south-eastern Utah represents fluvial, palustrine, and lacustrine strata deposited in a continental back-arc basin on the western edge of Pangea. Previous investigations interpreted a megamonsoonal climate with increasing aridity for the Colorado Plateau towards the end of the Triassic. In this study, we systematically integrate ichnological and pedological features of the Chinle Formation into ichnopedofacies to interpret palaeoenvironmental and palaeoclimatic variations in the north-eastern part of the Chinle Basin. Seventeen ichnofossil morphotypes and six palaeosol orders are combined into twelve ichnopedofacies, whose development was controlled by autocyclic and allocyclic processes and hydrology. Ichnopedofacies are used to estimate palaeoprecipitation in conjunction with appropriate modern analogue latitudinal and geographic settings. In the north-east Chinle Basin, annual precipitation was -1100-1300 mm in the Petrified Forest Member. Precipitation levels were >1300 mm/yr at the base of the lower Owl Rock Member, decreased to -700-1100 mm/yr, and then to -400-700 mm/yr. Two drying upward cycles from -1100 mm/yr to -700 mm/yr occurred in the middle and upper part of the Owl Rock Member. In the overlying Church Rock Member, precipitation decreased from -400 mm/yr at the base of the unit to -25-325 mm/yr at the end of Chinle Formation deposition. Ichnopedofacies indicate monsoonal conditions persisted until the end of the Triassic with decreasing precipitation that resulted from the northward migration of Pangea. Ichnopedofacies in the northeast Chinle Basin indicate both long-term drying of climate and short-term, wet-dry fluctuations.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2018, 88, 2; 127- 162
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Grammepus Hitchcock, 1858 : A sedimentary variant of the fossil insect trackway Lithographus
    Autorzy:
    Getty, Patrick R.
    Ward, Matthew
    Simon, Jack
    Powiązania:
    https://bibliotekanauki.pl/articles/1835988.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    ichnology
    arthropod ichnotaxonomy
    intergrading trace fossils
    morphological variability
    sediment saturation
    Opis:
    The ichnogenus Grammepus, which is inferred to have been made by a winged (pterygote) insect, was differentiated from other ichnotaxa because its largest tracks were nearly continuous, forming two furrows. Otherwise, it strongly resembles the ichnogenus Lithographus. Examination of both ichnogenera indicate that the largest tracks in Lithographus can be very close together, that some specimens of Grammepus lack furrow-like tracks, and that the type specimen of the type species Grammepus erismatus has separate tracks in some places, and furrow-like ones in others. Given the lack of a feature that can consistently differentiate Lithographus and Grammepus, the latter is synonymized with the former. Experiments with the modern cricket Acheta domesticus in sediment of different saturation levels indicate that a single pterygote producer could produce both “Grammepus-” and Lithographus-like morphologies, with the former being formed in wet, soft sediment wherein the legs drag, and the latter being formed in firmer, drier sediment wherein the legs do not drag.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2021, 91, 2; 113-120
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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