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Wyszukujesz frazę "Grigorescu, D" wg kryterium: Autor


Wyświetlanie 1-3 z 3
Tytuł:
A stratigraphic, taphonomic and paleoecologic approach to a "forgotten land": the dinosaur-bearing deposits from the Hateg Basin (Transylvania-Romania)
Autorzy:
Grigorescu, D.
Powiązania:
https://bibliotekanauki.pl/articles/22306.pdf
Data publikacji:
1983
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
This paper represents a general review of the stratigraphy, sedimentology, taphonomy and paleoecology of the dinosaur deposits (Sinpetru beds) from Hateg Basin, based on new field investigations in Sînpetru region — the classical area studied by F. Nopcsa. The age of these deposits, previously assigned to Danian, is proved to be Maastrichtian, through their geometric position, above the Campanian marine deposits, and the palynologic content (“Normapolles” association). The Sînpetru beds represent the deposits of a braided river system on the slope of a mountain piedmont apparently grading distally to deltaic conditions.
Źródło:
Acta Palaeontologica Polonica; 1983, 28, 1-2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Teeth of multituberculate mammals from the Late Cretaceous of Romania
Autorzy:
Csiki, Z
Grigorescu, D
Powiązania:
https://bibliotekanauki.pl/articles/22922.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Hainina
Maastrichtian Sinpetru Formation
mammal
Romania
Late Cretaceous
Densus-Ciula Formation
tooth
Hateg Basin
Europe
paleontology
multituberculate mammal
Źródło:
Acta Palaeontologica Polonica; 2000, 45, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Palaeoenvironmental interpretation of dinosaur- and mammal-bearing continental Maastrichtian deposits, Hateg basin, Romania
Autorzy:
Bojar, A. V.
Grigorescu, D.
Ottner, F.
Csiki, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2058894.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Hateg Basin
Maastrichtian
dinosaurs
paleosols
stable isotopes
clay mineralogy
Opis:
The Hateg basin, South Carpathians, Romania, contains a thick sequence of Maastrichtian continental deposits from which a rich dinosaur and mammal fauna is known. Field data as well as mineralogical and stable isotope analyses from three representative profiles were integrated in order to reconstruct environmental conditions during Maastrichtian time. Tustea quarry is characterized by the presence of well drained calcisols, with smectite (montmorillonite) as the main clay component. Along the profile, the δ18 O and δ13 C isotopic compositions of calcretes show a small variation, of up to 0.9‰. The profile along the Barbat Valley shows preponderantly calcisols, the main clay mineral being smectite, with subordinate illite and chlorite. The oxygen isotopic compositions of calcretes are ~0.5‰ lighter than those from Tustea. The soils are interpreted as having formed under more humid conditions and they are similar to those situated at the bottom of the sequence developed along Sibisel Valley. The abundant smectite from the Tustea and Barbat Valley depos its, as well the presence of good developed soils, reflects palaeoenvironmental conditions predominantly controlled by climate. Preliminary magnetostratigraphic data along the Sibisel Valley section indicate that sedimentation started at the end of chron C32n. All other palaeomagnetic sites distributed up stream, as far as the upper limit of this formation, have only reversed polarity and the corresponding time interval is probably chron C31r. Along this valley, the sequence shows a general coarsening upward trend. The palaeosol type changes from calcisol- to vertisol-dominated sequences. The soils are moderate to weakly developed. The mineralogical composition of the clay fraction also changes, from smectite- to illite and chlorite-dominated. These features points to wards unstable tectonic conditions and higher uplift rates of the surrounding area within chron C31r. To wards the top of the sequence, the oxygen and carbon isotopic composition of calcretes be come 1 and ~2‰ lighter, respectively. These changes indicate a transition from generally semi-arid to wards more humid and possible cooler conditions and correlate with the world wide trend for chron 31r.
Źródło:
Geological Quarterly; 2005, 49, 2; 205--222
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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