Journal
PALAEOBIODIVERSITY AND PALAEOENVIRONMENTS
Volume 94, Issue 4, Pages 495-528Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s12549-014-0168-6
Keywords
Distributary channel; Mouth bar; Interdistributary bay; Tempestite; Hirmeriella muensteri; Riparian habitat
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Funding
- Bundesministerium fur Umwelt, Naturschutz und Reaktorsicherheit [FKZ 0325285]
- project 'The biodiversity of the Late Permian floras in the German Zechstein Basin' [DE-TAF-3195]
- SYNTHESYS (EC Research Infrastructure Action, Program FP7 'Structuring the European Research Area')
- Alexander von Humboldt-Foundation [3.3-ITA/1141759STP]
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The historic Late Triassic outcrops at Fuchsberg and Langenberg near Seinstedt (Lower Saxony, Germany) are constrained to the Norian/Rhaetian boundary interval by means of conchostracan and palynomorph biostratigraphy. A comprehensive revision revealed a fluvial-dominated delta plain that formed in response to the successive transgression of the 'Rhaetian Sea' and received siliciclastics from southern source areas. At Fuchsberg and Langenberg, the distal lower delta plain is exposed and brackish subaqueous delta plain wetlands, mouthbar/distributary channel complexes and interdistributary bay subenvironments are reconstructed. Delta formation was controlled by bifurcation of distributary channels and avulsion of delta lobes. A diverse ecosystem is documented: a rich invertebrate fauna of limulids (1 taxon), insects (at least 20 taxa of 9 orders), malacostracans and conchostracans (several taxa) and a vertebrate fauna of amphibians (at least 1 taxon), sharks (9 taxa) and osteichthyan fishes (at least 6 taxa). In particular, fossiliferous interdistributary bay lithologies detail trophic systems of autochthonous subaqueous and parautochthonous riparian habitats. Abundant remnants of cycadophytes, ferns, horsetails and large vertebrates from Fuchsberg and adjacent outcrops of the Seinstedt area enable the reconstruction of vegetated upstream environments at the upper delta plain and floodplain.
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