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Preliminary multi-isotope analysis of Mastodonsaurus teeth and associated faunas from the Middle Triassic of Germany.

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Moreno,  Raphael
External Organizations;
GFZ SIMS Publications, GFZ Helmholtz Centre for Geosciences;

Schoch,  Rainer R.
External Organizations;
GFZ SIMS Publications, GFZ Helmholtz Centre for Geosciences;

Vonhof,  Hubert
External Organizations;
GFZ SIMS Publications, GFZ Helmholtz Centre for Geosciences;

/persons/resource/agiera

Wudarska,  Alicja       
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, GFZ Helmholtz Centre for Geosciences;
GFZ SIMS Publications, GFZ Helmholtz Centre for Geosciences;

Mujal,  Eudald
External Organizations;
GFZ SIMS Publications, GFZ Helmholtz Centre for Geosciences;

Tütken,  Thomas
External Organizations;
GFZ SIMS Publications, GFZ Helmholtz Centre for Geosciences;

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Moreno, R., Schoch, R. R., Vonhof, H., Wudarska, A., Mujal, E., Tütken, T.(2024): Preliminary multi-isotope analysis of Mastodonsaurus teeth and associated faunas from the Middle Triassic of Germany., Joint Meeting of the Polish Paleobiologists, and the 95th Annual Meeting of the Paläontologische Gesellschaft (Palges) (Warsaw, Poland 2024).
https://doi.org/10.4202/app.01209.2024


???ViewItemOverview_lblCiteAs???: https://gfzpublic.gfz.de/pubman/item/item_5037012
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The Middle Triassic (Ladinian) fossil assemblages from the Lower Keuper localities of Vellberg-
Eschenau and Kupferzell (Germany) are notable for their rich vertebrate fauna, including the ear-
liest stem-turtle Pappochelys rosinae and the oldest rhynchocephalian Wirtembergia hauboldae.
Among them, the largest temnospondyl known to date, Mastodonsaurus giganteus, is an iconic
apex predator in these swamp-like ecosystems. Stable isotopes (δ18 O CO3, δ13C) of Mastodonsaurus
tooth enamel were analysed in bulk samples using continuous-flow mass spectrometry for selected
teeth to characterize its habitat conditions and paleoecology at the two contemporaneous locali-
ties. To further assess similarities and differences in the paleoenvironmental settings of the fossilifer-
ous horizons, additional skeletal remains from associated aquatic and terrestrial fauna (Ceratodus,
Serrolepis, Nothosaurus, Batrachotomus, Pappochelys) were also analysed for comparison. High-
resolution secondary ion mass spectrometry (SIMS) in situ δ18 O analyses in the thin enamel were
performed to determine paleoenvironmental conditions such as salinity and temperature changes,
and thus niche occupation. Preliminary δ13C and δ18 O data from Mastodonsaurus tooth enamel
reveal differences in isotope compositions between Vellberg-Eschenau (δ13C VPDB = -8.7‰ [range:
-13.4 to -6.8‰], δ18 O CO3,VSMOW = 24.1‰ [range: 22.1–26.0‰]) and Kupferzell ( δ13C VPDB = -8.1‰
[range: -11.3 to -7.2‰], δ18 O CO3,VSMOW = 25.1‰ [range: 24.0–26.4‰]), despite their geographical
proximity. Complementary, comparative analysis of Mastodonsaurus fang teeth of different sizes
shows a slight variation in their intra-tooth δ13C and δ18 O signatures, hinting at potential ontoge-
netic differences. Additional 87Sr/86Sr analysis of Mastodonsaurus enamel will further refine paleo-
salinity reconstructions for these Middle Triassic Keuper swamp settings through combined Sr and
O isotope mixing models and provide insights into habitat use and potential migration