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Klein H.,Saurierwelt Palaontologisches Museum | Lucas S.G.,New Mexico Museum of Natural History | Voigt S.,Urweltmuseum GEOSKOP
Ichnos:an International Journal of Plant and Animal | Year: 2015

Procolophonichnium is a globally distributed but rare tetrapod ichnogenus ranging from the ?Late Permian/Early Triassic through the Late Triassic. A Permian age of the holotype from the Karoo of South Africa, as has been proclaimed by some workers, is doubtful. Descriptions lack coordinates of the type locality but suggest instead a position in Lower Triassic strata. Procolophonichnium material from North and South Africa, central Europe, North and South America is re-evaluated. Furthermore, the new ichnospecies Procolophonichnium lockleyi from the Upper Triassic of the Germanic Basin is introduced, based on material with well-preserved trackways that show distinct morphological features, such as an extended “heel” behind digit V. Five ichnospecies are considered as valid: P. nopcsai (type ichnospecies), P. haarmuehlensis, P. nectouxi (new comb.) and P. polonicum as Procolophonichnium tracks from ?Upper Permian, Lower and Middle Triassic strata, and P. lockleyi ichnosp. nov. from the Upper Triassic. Trackmakers of Procolophonichnium were most likely therapsids based on the digit configuration and the phalangeal formula derived from preserved pads. A prococolophonid affinity, as was generally proclaimed, or the attribution to other groups such as captorhinids, is less probable. © 2015, Copyright © Taylor & Francis Group, LLC. Source

Voigt S.,Urweltmuseum GEOSKOP | Lucas S.G.,New Mexico Museum of Natural History and Science | Krainer K.,University of Innsbruck
Palaeogeography, Palaeoclimatology, Palaeoecology | Year: 2013

The Early Permian Robledo Mountains Formation of the Hueco Group in the Robledo Mountains, south-central New Mexico, U.S.A., is a world-class ichnofossil Lagerstätte of supposed peritidal origin. Abundant and diverse invertebrate and vertebrate trace fossils occur in several thin horizons of siliciclastic red beds that are intercalated with thick successions of shallow marine limestone and shale. The depositional environment of the red beds has been discussed for decades but without any detailed sedimentary facies analysis. A recently completed systematic excavation shows that the majority of trace fossils is related to mud-draped surfaces within distal crevasse-splay siltstone to fine-grained sandstone. Interbedded mudstone with well-preserved macrofloral remains and a lungfish aestivation burrow represents a hitherto disregarded facies in overbank fines. Both environmental subzones were at least loosely covered with low-growing plants and experienced common periods of subaerial exposure. None of the physical and biological structures recorded in the measured section indicates tidal influence, but instead they support the reconstruction of a freshwater ecosystem dominated by arthropods and tetrapods. Given their proximity to carbonates of unambiguous subtidal origin, we propose that the trace-fossil-bearing red beds of the Robledo Mountains Formation formed in distal parts of an extensive coastal floodplain during alternating wet and dry conditions. If this interpretation is correct, it provides an impetus to continue ichnological and sedimentological field research in the study area, because the true tidal-flat ichnoguilds still await elucidation. © 2012 Elsevier B.V. Source

Franz M.,TU Bergakademie Freiberg | Franz M.,University of Gottingen | Kaiser S.I.,Staatliches Museum fur Naturkunde Stuttgart | Fischer J.,Urweltmuseum GEOSKOP | And 7 more authors.
Global and Planetary Change | Year: 2015

The Upper Muschelkalk in the Central European Basin (CEB) is a key example of eustatic and climatic controls on inland seas. The late Anisian rapid transgression from Tethyan waters culminated in a large semi-enclosed inland sea stretching across the CEB. Subsequently, the slow but successive retreat in the early Ladinian resulted in a small remnant sea. The pronounced stratal pattern architectures are translated into a framework of 3rd- and 4th-order T-R sequences. The latest Illyrian 3rd-order maximum flooding surface corresponds to maximum abundances of carbonates and marine phytoplankton. An euryhaline marine ecology is indicated by prasinophycean algae dominating over acritarchs and δ18OP values of 18.9-22.4‰ VSMOW corresponding to Tethyan references. During the 3rd-order regressive phase successive freshening up to hyposaline conditions is indicated by up to 3‰ depleted δ18OP values, shifts to more radiogenic 87Sr/86Sr ratios and maximum abundances of terrestrial palynomorphs. Likewise, 4th-order T-R sequences are constrained by commutated stratal pattern architectures, palynofacies and geochemistry. The favourable correlation of middle Triassic 3rd-order sequences of Tethyan and peri-Tethyan basins demonstrate the principle control of circum-Tethyan eustatic cycles. 4th-order sequences are evident and, although not yet correlatable in detail, indicate 106-year scale eustatic cycles which may be attributed to glacioeustatic sea-level changes. The subordinated control of arid to semiarid low latitude and semihumid to humid temperate mid latitude climates affected the Upper Muschelkalk Sea in particular during 4th-order sea-level lowstands. Substantial fresh water input from Scandinavian sources caused temporal stratification leading to stagnant bottom waters and/or sediments as indicated by palynofacies and U/Th and Ni/Co redox indices. The herein reconstructed middle Triassic zonal climates are in agreement to previously published Late Triassic zonal climates. © 2015 Elsevier B.V. Source

Hamad A.A.,University of Jordan | Fischer J.,Urweltmuseum GEOSKOP | Voigt S.,Urweltmuseum GEOSKOP | Kerp H.,University of Munster | And 4 more authors.
Journal of Vertebrate Paleontology | Year: 2016

Citation for this article: Abu Hamad, A., J. Fischer, S. Voigt, H. Kerp, J. W. Schneider, and F. Scholze. 2016. First Permian occurrence of the shark egg capsule morphotype Palaeoxyris Brongniart, 1828. Journal of Vertebrate Paleontology. DOI: 10.1080/02724634.2016.1112290. © 2016 by the Society of Vertebrate Paleontology Source

Hminna A.,Chouaib Doukkali University | Voigt S.,Urweltmuseum GEOSKOP | Klein H.,Saurierwelt Palaontologisches Museum | Saber H.,Chouaib Doukkali University | And 2 more authors.
Journal of African Earth Sciences | Year: 2013

The Sidi Said Maachou area in the Moroccan western Meseta preserves a succession, up to 400. m thick, of hitherto poorly studied continental Triassic deposits. Recent detailed geological mapping proposes a lithostratigraphic subdivision of the predominantly red-coloured siliciclastic deposits into three formations. Laminated mudstones and fine-grained sandstones in the upper part of the Oued Oum Er Rbiaa Formation have the most interesting fossil content including plant impressions, rhizoliths, fish scales, and invertebrate and vertebrate traces. These biogenic remains are partially associated with tool marks, microbially induced sedimentary structures, oscillation ripples, desiccation cracks, and halite pseudomorphs, suggesting sedimentation in a playa-like, fluvio-lacustrine system under semiarid conditions. All tetrapod footprints from these beds are assigned to Brachychirotherium parvum and indistinguishable from other occurrences of the ichnogenus in Central Europe and North America. Supposed trackmakers are archosaurs of the crocodile stem-group (Crurotarsi) that were widely spread over Triassic Pangaea. Because Brachychirotherium is only known from Late Triassic (Carnian-Rhaetian) deposits, the same age is attributed to the footprint horizon of the Oued Oum Er Rbiaa Formation. This is the first record of Brachychirotherium on the African continent and the first record of Triassic tetrapod footprints in Morocco outside of the High Atlas. © 2012 Elsevier Ltd. Source

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