Winterswijk Quarry, layer 43 (Triassic of Netherlands)

Where: Netherlands (52.0° N, 6.8° E)

• Paleocoordinates: 30.2° N, 26.2° E (Wright 2013)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Vossenveld Formation, Bithynian (245.0 - 244.2 Ma)

• Layer 43 is considered to be Illyrian in age (Hagdorn and Simon 2010; Maxwell et al. 2016). Although this Illyrian date for layer 43 is upheld in this publication, it should be noted that this implies a large sedimentation gap or a severely reduced sedimentation rate between layer 37 (Bithynian) and layer 43 (Illyrian), which seems discordant with the available stratigraphic evidence. The Illyrian dating is also not compatible with the palynological results obtained by Herngreen et al. (2005a, b), which indicate that the top section of the stratigraphy belongs to the Bithynian substage of the Anisian. Although it would seem most probable that layer 43 is of Bithynian age as the palynological date assigned by Herngreen et al. (2005a, b) is based on two separate stratigraphic marker species, further stratigraphic studies are required.

• group of beds-level stratigraphic resolution

Environment/lithology: lagoonal or restricted shallow subtidal; lithified carbonate

• The strata at Winterswijk are thought to alternately document shallow marine environments and tidally influenced sabkha-like (hypersaline) mudflats with algal laminates, polygonal mudcracks and reptile trackways.
• Partially laminated micritic limestones which in turn consist of alternating marly limestones, dolomites, clayey marls and dolomitic clay layers

Size class: macrofossils

Preservation: adpression

Collection methods: Repository: Naturalis Biodiversity Center, Leiden, the Netherlands (RGM) and collection

•of Adam Haarhuis (AHWW)

Primary reference: T. van Eldijk, G. Goris, A. Haarhuis, J. Lankamp, H. Winkelhorst, J. Reumer, A. Nel and T. Wappler. 2017. New fossil insects from the Anisian (Lower to Middle Muschelkalk) from the Central European Basin (Germany and The Netherlands). PalZ 91:185-194 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 186555: authorized by Matthew Clapham, entered by Matthew Clapham on 25.06.2017

Creative Commons license: CC0 (CC0)

Taxonomic list

Actinopteri
 Macrosemiiformes - Macrosemiidae
Eosemionotus ratumensis n. sp.1 Diependaal et al. 2024
RGM.1286402 (CHW 481/43-5), RGM.1286398 (CHW 672/43-1), RGM.1286399 (CHW 673/43-2), RGM.1286400 (CHW 674/43-3), RGM.1286401 (CHW 479/43-4), RGM.1286403 (CHW 549/43-6)
Xiphosura
 Xiphosurida - Limulidae
Limulitella bronnii2 Schimper 1853 horseshoe crab
RGM.1333509
Insecta
 Dicondylia -
Neoptera indet., "? Grylloblattida indet." = Grylloblattodea, Coleoptera indet.
Neoptera indet. Martynov 1923 winged insect
RGM-791779 (order undetermined, but pattern of venation observed in some Orthoptera)
"? Grylloblattida indet." = Grylloblattodea Walker 1914 ice crawler
RGM.792411
Coleoptera indet. Linnaeus 1758 beetle
AHWW-0221
Malacostraca
 Isopoda -
Gelrincola winterswijkensis n. gen. n. sp.3 Schàˆdel et al. 2020 isopod