Krzysztof Owocki- Phd
- adjunct at Polish Academy of Sciences
Krzysztof Owocki
- Phd
- adjunct at Polish Academy of Sciences
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39
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Publications (39)
The early radiation of dinosaurs remains a complex and poorly understood evolutionary event1, 2, 3–4. Here we use hundreds of fossils with direct evidence of feeding to compare trophic dynamics across five vertebrate assemblages that record this event in the Triassic–Jurassic succession of the Polish Basin (central Europe). Bromalites, fossil diges...
Ammonoids are extinct cephalopods with external shells which predominated in many late Paleozoic and Mesozoic marine ecosystems. Stable isotope data from ammonoid shells constitute primary tools for understanding their palaeohabitats. However, in most sedimentary successions globally the aragonitic shells of ammonoids are dissolved during fossilisa...
A positive carbon stable isotope excursion of about 3‰ is documented in the topmost lower Frasnian at Padberg, eastern Rhenish Massif, as a muted record of the worldwide early−middle Frasnian isotopic perturbation (punctata Event; up to 6–8‰ shift in both δ¹³Ccarb and δ¹³Corg elsewhere), comparable with the Appalachian δ¹³C curve. This German isoto...
Dental morphology, microstructure and chemistry provide unique insights into various aspects of the evolutionary history and ecology of extinct clades. However, most studies have focused exclusively on the morphological aspects of teeth, while there are significantly fewer detailed accounts of tooth microstructure and mineralogy. Here we provide a...
Diets of pterosaurs have mainly been inferred from indirect evidence such as comparative anatomy, associations of co-occurring fossils, and functional morphology. Gut contents are rare, and until now there is only a single coprolite (fossil dropping), with unidentified inclusions, known. Here we describe three coprolites collected from a palaeosurf...
Stable isotopes of oxygen and carbon of tooth enamel are increasingly being used as tracers to study palaeoecology and the diet preferences of fossil vertebrates. We serially sampled tooth enamel carbonate along the growth axes of five Early Maastrichtian carnivorous dinosaur teeth (Tarbosaurus bataar tyrannosaurid) from the Nemegt Formation, Mongo...
The test structures of Lagenida, Rotaliida, and Miliolida (Foraminifera) are described at an unprecedented scale of resolution. Observations using conventional and field-emission scanning electron microscopy revealed distinct micro- and nanoscale differences in the textural compositions of these three main groups of calcifying foraminifers, consist...
Residues of twenty-five coprolite fragments collected from the Upper Permian of Vyazniki (European Russia) were studied in detail. The phosphatic composition, general shape and size, and bone inclusions of these specimens indicate that medium to large-sized carnivores, such as therocephalian therapsids or early archosauriforms, were the most likely...
Coprolites (fossil faeces) provide direct evidence on the diet of its producer and unique insights on ancient food webs and ecosystems. We describe the contents of seven coprolites, collected from the Late Permian Vyazniki site of the European part of Russia. Two coprolite morphotypes (A, B) contain remains of putative bacteria, cyanobacteria, fung...
Vertebrate trace fossils often provide a measure of cryptic biodiversity, and are especially pertinent when skeletal remnants are exceptionally rare. The Lower Triassic (lower Olenekian) Bulgo Sandstone at Long Reef in the Sydney Basin of southeastern Australia constitutes just such a deposit, having yielded isolated bones of giant capitosaurian te...
Well-preserved mycelia of fungal- or saprolegnia-like biota mineralised by ferromanganese oxides were found for the first time in long bones of Late Cretaceous dinosaurs from the Gobi Desert (Nemegt Valley, Mongolia). The mycelia formed a biofilm on the wall of the bone marrow cavity and penetrated the osteon channels of the nearby bone tissue. Opt...
We report on the first microvertebrate assemblage from the Keuper of Silesia. Upper Middle-Upper Triassic fossiliferous layers in this region preserve unique assemblages of small vertebrates that originate from different freshwater and terrestrial environments. Late Triassic small vertebrate faunas document aspects of a critical evolutionary transi...
The Nemegt Formation in the Gobi Desert (southern Mongolia) is famous for its diverse terrestrial vertebrate fauna from the end of the Cretaceous. It is characterized by a fairly homogeneous state of preservation of bones and a high degree of articulation of dinosaur skeletons. So far, only in a single paper have carbon and oxygen isotopic signatur...
Eighteen dicynodont bones (Reptilia, Therapsida), collected from six bone-bearing horizons, were examined in order to decipher their taphonomic histories. The examined remains have been subdivided into two main groups. The first group comprises bones with strongly abraded cortex, or none at all. Internal voids are filled with dark grey silt accompa...
A significant number (more than 100) of brown to dark and silty, carbonate or pyrite-mineralized, in part organic carbon-rich, spherical or oval-shaped structures have been collected from the Upper Triassic (uppermost Norian-lower Rhaetian) sediments of the Lipie Śląskie clay-pit at Lisowice near Lubliniec town, Poland. Their geological context, mo...
Background: Sub-recent volcanic glass shards with microbial mineral coatings from a caldera lake on Niuafo’ou Island (Tonga) were studied. These are compared with structurally similar volcanic glass shards with mineral envelopes of purported microbial origin from the Paleoarchean (ca. 3.4 Ga) Kromberg Formation of the Barberton greenstone belt (Sou...
Numerous coprolites have been found in the Vyazniki and Gorokhovets localities of European Russia. Five identified coprolite-bearing horizons occur in the upper Permian deposits of the Vyatkian Regional Stage. Coprolites were collected from mudstone with a coprolite breccia-like layer and also from intraformational conglomerates that were deposited...
Numerous coprolites have been found in the Vyazniki and Gorokhovets localities of European Russia. Five identified coprolite-bearing horizons occur in the upper Permian deposits of the Vyatkian Regional Stage. Coprolites were collected from mudstone with a coprolite breccia-like layer and also from intraformational conglomerates that were deposited...
Bones, while buried, undergo diagenetic transformations, the intensity of which depends on a variety of geochemical factors. Microbial degradation is one of the main processes acting on bones during early diagenesis. We present mineral microspheres formed during bone diagenesis from the inner walls of the left tibia of the Late Cretaceous dinosaur...
A specimen of the Sahara 02500 ordinary chondrite contains
shock-produced veins consisting of recrystallised fine-grained pyroxenes
that include small droplets of Ni-rich metal. Non-melted olivines and
pyroxenes show planar deformations filled by shock-melted and -polluted
metal and troilite. Shock-melted feldspathic glass is present close to
the s...
Mineralogy and petrology of two ordinary chondrites and their correlation with other meteorites
Two ordinary chondrites are compared and classified using transmitted and reflected light microscopy and electron microprobe analyses. Both meteorites were confiscated by the Polish Customs Service at the border with Belarus. The first meteorite (called...
