- Tytuł:
- Life span and growth rate of Middle Jurassic mesohibolitid belemnites deduced from rostrum microincrements
- Autorzy:
- Wierzbowski, H.
- Powiązania:
- https://bibliotekanauki.pl/articles/2061020.pdf
- Data publikacji:
- 2013
- Wydawca:
- Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
- Tematy:
-
belemnite rostra
belemnites
growth rings
Polish Jura Chain
Bathonian
Ore Bering Częstochowa Clay Formation
rostry belemnitów
belemnity
pierścienie wzrostu
Wyżyna Krakowsko-Częstochowska
baton
formacja częstochowskich iłów rudonośnych - Opis:
- The microincrements of nine Middle Jurassic mesohibolitid belemnite rostra (Hibolithes jurensis, Pachybelemnopsis fusiformis and Pachybelemnopsis “subhastatus”) were analysed to measure the ontogenic age and growth rate of the belemnites. The microincrements are interpreted to have been formed daily based on analogy with extant coleoid cephalopods and the frequency of circadian rhythms in animal activity. The mesohibolitid belemnites are found to have had a short life span of ca. 1 year. The short life span of the belemnites studied is similar to the life span of modern coleoids (squids, cuttlefishes and common octopuses). It restricts the utility of belemnite rostra as a proxy for average secular seawater temperatures and chemistry. Short-lived cycles (2–8 days) in the belemnite growth rate are linked to variations in the metabolic activity of these animals. Minor diagenetic alteration revealed by the dull cathodoluminescence of some rostra is found to have no effect on the preservation of the growth rings.
- Źródło:
-
Volumina Jurassica; 2013, 11, 1; 1--18
1896-7876
1731-3708 - Pojawia się w:
- Volumina Jurassica
- Dostawca treści:
- Biblioteka Nauki
Artykuł