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Wyszukujesz frazę "Bromley, R. G." wg kryterium: Wszystkie pola


Wyświetlanie 1-5 z 5
Tytuł:
New ichnotaxa based on tooth impressions on dinosaur and whale bones
Autorzy:
Jacobsen, Aa. R.
Bromley, R. G.
Powiązania:
https://bibliotekanauki.pl/articles/2059250.pdf
Data publikacji:
2009
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
bite trace
bone substrate
shark
Linichnus serratus
theropod
Knethichnus parallelum
Opis:
Traces produced by teeth on bones provide a source of information on the feeding behaviour, predator-prey relationships, and tooth morphology of the tracemaking carnivores and scavengers involved. Studies on mammals, both fossil and recent, have used tooth-scratched bones as clues to the feeding behaviour of carnivorous, scaveng ing, mineral-seeking and tooth-sharpening mammals in various ecosystems. Similarly, theropod tooth traces have the potential of being important for studying the ecology and ethology of both carnivorous and herbivorous dinosaurs. This paper augments the ichnological nomenclature for traces made by teeth on bones. Two new ichnogenera and ichnospecies, Linichnus serratus and Knethichnus parallelum, are introduced on the basis of the morphology of theropod biting damage, to focus on the resulting trace fossils as an ichnological feature and to encourage further observation and studies of distrtibution. Using similar ichnological terminology for both theropod and mammalian feeding traces, and even those of selachian sharks preying on whales or scavenging their corpses, will help coordinate biting strategies, jaw mechanism and feeding behaviour for both recent and ancient carnivores and scavengers.
Źródło:
Geological Quarterly; 2009, 53, 4; 373-382
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioerosional ichnotaxa and the fossilization barrier
Autorzy:
Bromley, R. G.
Nielsen, K. S. S.
Powiązania:
https://bibliotekanauki.pl/articles/191978.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Fossilized
unfossilized
bioerosion
trace fossils
microborings
Opis:
For the establishment of a new ichnogenus or ichnospecies, the type material shall be fossil, not unfossilized material. This is not always possible, because the transition between the two states, the fossilization barrier, is extremely vague defined. In most fossil material, this is not a problem. However, in the case of bioerosion structures (borings, rasping traces, attachment scars in hard substrates), the problem is serious. For example, when does a sponge boring in an oyster shell be come fossilized? The question arises when Recent and sub-Recent materials are considered. Two examples are discussed. (1) Microborings are described and named in foraminifera dredged from the sea floor. In this material, it is not possible to distinguish between “fossilized” and “unfossilized” foraminifera. Bioturbation and other processes may have mixed recently dead, Pleistocene and older foraminifera in the sea-floor sediments. (2) Small, characteristic borings are made by slipper limpets in pagurized gastropod shells. The structures would constitute a new ichnospecies of Oichnus, but these borings have not been found in “fossilized material” and the borings therefore remain nameless. Because bioerosion structures constitute “ready-made fossils”, it is suggested that the onset of fossilization be equated with the death of the bioeroding tracemaker.
Źródło:
Annales Societatis Geologorum Poloniae; 2015, 85, 3; 453-455
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crouching theropod and Navahopus sauropodomorph tracks from the Early Jurassic Navajo Sandstone of USA
Autorzy:
Milan, J
Loope, D.B.
Bromley, R.G.
Powiązania:
https://bibliotekanauki.pl/articles/21900.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Navajo Sandstone Formation
Navahopus coyoteensis
Early Jurassic
crouching trace
paleontology
Navahopodidae
sauropodomorph track
ichnology
Southern Utah
USA
theropod dinosaur
Theropoda
trackway
locomotory habit
Sauropodomorpha
Navahopus
Jurassic
Northern Arizona
remains
theropod track
Opis:
Numerous tracks and trackways are preserved in the a cross−strata of the Lower Jurassic Navajo Sandstone of northern Arizona and southern Utah, USA. Tracks and trackways of small theropod dinosaurs are particularly abundant within one 10−m−thick interval. This paper describes a crouching trace from a theropod dinosaur that shows impressions of all four limbs, the ischial callosity, the tail, and tracks leading to and away from the crouching site, and revises the interpretation of a well preserved trackway hitherto referred to the synapsid ichnogenus Brasilichnium and here considered to be from a sauropodomorph dinosaur. It is named Navahopus coyoteensisisp. nov. on the basis of morphological differences from the type ichnospecies N. falcipollex. The ichnofamily Navahopodidae is revised to include Tetrasauropous unguiferus, Navahopus falcipollex, and N. coyoteensis.
Źródło:
Acta Palaeontologica Polonica; 2008, 53, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecdysichnia : a new ethological category for trace fossils produced by moulting
Autorzy:
Vallon, L. H.
Schweigert, G.
Bromley, R. G.
Röper, M.
Ebert, M.
Powiązania:
https://bibliotekanauki.pl/articles/191743.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Animal behaviour
ecdysis
Solnhofen lithographic limestones
Schwoimarken
Opis:
The shedding of exoskeletons is an important aspect of the lifecycle of some in vertebrates (mainly arthropods). To rid them selves of the old cuticula (= exuvia), these animals of ten have to thrash about, twist around or rub themselves against the sediment or other more or less solid objects. In softgrounds, this behaviour may create distinctive patterns that have to be regarded as trace fossils. Accordingly, some ichnospecies of Rusophycus have recently been interpreted as traces made during ecdysis. Most of the so-called “Schwoimarken” from the Solnhofen lithographic limestones (Upper Jurassic, SE Germany), usually interpreted as structures made by dead organisms swaying in response to water movements, must be understood as traces of arthropod ecdysis. In this context, we erect Harpichnus bartheli igen. et isp. nov. and propose the new ethological category, ecdysichnia, for moulting traces. In most “Schwoimarken” containing body-fossil remains other than arthropods, we see sediment displacement by scavenging arthropods rather than mortichnia (sensu Seilacher, 2007). We further propose inclusion of the recently erected category pupichnia for pupation chambers as a subcategory of ecdysichnia. In our opinion, pupation is a special form of moulting that does not justify the splitting of categories, as briefly noted by Vallon et al. (2013).
Źródło:
Annales Societatis Geologorum Poloniae; 2015, 85, 3; 433-444
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Centrichnus eccentricus revisited: a new view on anomiid bivalve bioerosion
Autorzy:
Neumann, C.
Wisshak, M.
Aberhan, M.
Girod, P.
Rosner, T.
Bromley, R.G.
Powiązania:
https://bibliotekanauki.pl/articles/22619.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Saddle oysters (Anomiidae) attach themselves to calcareous hard substrates by means of a calcified byssus that etches an attachment structure, referred to as ichnospecies Centrichnus eccentricus. Examination of rich material from the Late Cretaceous of central Europe extends the fossil record of this ichnotaxon and revealed a set of previously unrecognised morphological features which appear to be typical for this time period and the respective anomiid trace maker. Excellent preservation of a large number of trace fossil specimens with a complete set of morphological characters allowed a biometrical analysis and additional observations indicating a distinct substrate preference for belemnite rostra, a strong intra- and interspecific competition for settlement space, as well as interactions with durophaguous predators. Further implications for anomiid palaeobiology and palaeoecology arise from allometric shell growth and an etched outline suture in the substrate along the dorsal, lateral and ventral shell margins. These features enhanced a firm attachment and increased shear resistance, and thus are interpreted as an effective defence mechanism against shell-crushing enemies under the intensified predation pressure in marine environments in the Late Cretaceous.
Źródło:
Acta Palaeontologica Polonica; 2015, 60, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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