Temat: zapis - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Genus-level versus species-level extinction rates
Autorzy:: Trammer, J.
Powiązania:: https://bibliotekanauki.pl/articles/139152.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: extinction
rates
species
genera
fossil record
wygaśnięcie
ocena
gatunki
rodzaj
zapis kopalny
Opis:: The average extinction rates of index species per m. y. are computed by means of a count-of-biozones metric (Trammer 2014). These rates and the average extinction rates of genera belonging to biostratigraphically important groups, calculated according to three different methods, show congruent rises and falls from the Cambrian to the Neogene. The extinction rates of genera are, thus, a relatively good predictor of species extinction rates.
Źródło:: Acta Geologica Polonica; 2016, 66, 3; 261-265
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: A tyrannosaurid pedal ungual from the Williams Fork Formation (Campanian) of Colorado and its implications for the biogeography of Laramidian dinosaurs
Autorzy:: Yun, Chan-Gyu
Powiązania:: https://bibliotekanauki.pl/articles/24024717.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: dinosauria
theropoda
tyrannosauridae
fossil record
pedal ungual anatomy
dinosaur biogeography
dinozaury
teropody
tyranozaury
zapis kopalny
anatomia
pazury
biogeografia
Opis:: A right theropod pedal ungual phalanx II-3 from the Campanian Williams Fork Formation of northwestern Colorado is described, and a combination of features, including the large size, tapering distal tip, robust and stout overall form, triangular cross-section, and a relatively flat ventral surface allows a confident referral to Tyrannosauridae Osborn, 1906. Although this specimen was found in a relatively southern state, the proximal articular surface of this ungual is similar to that of Gorgosaurus libratus Lambe, 1914, a taxon found in the northern state, Alberta. Although based on limited evidence, this may suggest that the range of tyrannosaurids considered endemic to the north of Laramidia extended farther south than previously thought.
Źródło:: Acta Geologica Polonica; 2023, 73, 1; 63--72
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

Artykuł

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