Winterswijk Quarry subrosion pipe (Triassic of Netherlands)

Where: Netherlands (52.0° N, 6.8° E: paleocoordinates 38.6° N, 7.3° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Rhaetian (208.5 - 201.3 Ma)

• Upper Triassic (middle Rhaetian) dark shales were encountered at several isolated spots, for instance in a subrosion pipe or sinkhole (a geological phenomenon that occurs due to dissolution of strata in the subsurface causing the overlying sediments to collapse) at Quarry III. Because of collapse of the subrosion pipe, probably during the Eocene, the Rhaetian shales (2–4 m in overall thickness) were mixed with Hettangian clays.

• group of beds-level stratigraphic resolution

Environment/lithology: paralic; lithified shale

• Deposition of the shales at Winterswijk occurred in a near-coastal, assumedly very shallow, setting. The oligospecific bivalve assemblage and the absence of other benthic groups such as corals, bryozoans and brachiopods (Klompmaker et al. 2010) are indicative of either fluctuating or low salinity levels, dysoxic bottom waters or a combination of both. The presence of a single brittle star species rather than a diverse assemblage as commonly observed in soft-bottom habitats (e.g., Hess 1966) corroborates the assumption of a stressed regime.

Size class: macrofossils

Preservation: replaced with pyrite

Collected in 2006, 2007

• Repository: Naturalis Biodiversity Center (Leiden; NCB-RGM 344 003–344 037) and Freriks Museum, Winterswijk (FMW 0242–21364)

Primary reference: B. Thuy, A. A. Klompmaker, and J. W. M. Jagt. 2012. Late Triassic (Rhaetian) ophiuroides from Winterswijk, the Netherlands; with comments on the systematic position of Aplocoma (Echinodermata, Ophiolepididae). Zoosymposia 7:163-172 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 137658: authorized by Matthew Clapham, entered by Matthew Clapham on 18.12.2012, edited by Thomas Schossleitner

Creative Commons license: CC BY (attribution)

Taxonomic list

 Palaeocopida -
Circulina "type B" Sepkoski 2002 ostracod
Circulina type B in Brugman 1983
Bivalvia indet. Linnaeus 1758 clam
 Ostreida - Pteriidae
Rhaetavicula contorta Portlock 1843 pearl oyster
 Mytilida - Mytilidae
Modiolus sp. Lamarck 1801 mussel
 Carditida - Carditidae
 Pholadida - Ceratomyidae
Pteromya sp. Moore 1861 clam
 Cardiida - Arcticidae
Isocyprina sp. Röder 1882 clam
cf. Isocyprina sp. Röder 1882 clam
 Cardiida - Cardiidae
Protocardia rhaetica Merian 1853 cockle
 Trigoniida - Myophoriidae
"Lyriomyophoria postera" = Elegantinia
"Lyriomyophoria postera" = Elegantinia clam
 Ophiurida - Ophiolepididae
Aplocoma agassizi von Münster 1839 brittle star
 Pinales - Cheirolepidiaceae
"Classopollis spp." = Classopollis, "Corollina zwolinskae" = Classopollis
"Classopollis spp." = Classopollis Pflug 1953
"Corollina zwolinskae" = Classopollis
Todisporites sp. Couper 1958
Peromonolites sp. Couper 1953
 Gleicheniales - Gleicheniaceae
Gleicheniidites sp. Dettmann 1963
  - Selaginellaceae
cf. Uvaesporites sp. Döring 1965
 Life -
Cymatiosphaera sp. Wetzel and Deflandre 1954 acritarcs
 Gymnospermophyta -
 Gonyaulacales - Shublikodiniaceae
Rhaetogonyaulax sp. Sarjeant 1966