Early Middle Triassic (Anisian) trace fossils, ichnofabrics, and substrate types from the southeastern Germanic Basin (Wellenkalk facies) of Upper Silesia, southern Poland: Implications for biotic recovery following the Permian/Triassic mass extinction

2020 ◽  
Vol 194 ◽  
pp. 103290
Author(s):  
Michał Stachacz ◽  
Michał Matysik
Keyword(s):  
Mass Extinction ◽  
Middle Triassic ◽  
Trace Fossils ◽  
Upper Silesia ◽  
Germanic Basin ◽  
Southern Poland ◽  
Biotic Recovery ◽  
Early Middle Triassic ◽  
Substrate Types

scholarly journals A regurgitalite of the Middle Triassic (Muschelkalk) from Upper Silesia (Poland)

2021 ◽  
Vol 47 (1) ◽  
pp. 33-40
Author(s):  
Robert Niedźwiedzki ◽  
Dawid Surmik ◽  
Agnieszka Chećko ◽  
Mariusz A Salamon
Keyword(s):  
Host Rock ◽  
Middle Triassic ◽  
Upper Silesia ◽  
Germanic Basin ◽  
Southern Poland ◽  
Marine Reptiles ◽  
Sharp Edges

A bromalite from the Middle Triassic (Muschelkalk) of southern Poland, Sadowa Góra Quarry, is herein described and interpreted as a regurgitalite. The fossils occurring within the regurgitalite are angular and have sharp edges. They are represented by common fragments of thin-shelled bivalves as well as rare crinoid and gastropod remains. The composition of the collected inclusion is different from that of the host rock. There are many candidates that could have produced the regurgitalite, including durophagous sharks, marine reptiles, the actinopterygian Colobodus, or nautiloids. Our finding adds to the emerging evidence of durophagous predation in the Triassic sea of Polish part of the Germanic Basin. It is the second record of a regurgitalite from the Muschelkalk of Upper Silesia.

scholarly journals Footprints pull origin and diversification of dinosaur stem lineage deep into Early Triassic

2010 ◽  
Vol 278 (1708) ◽  
pp. 1107-1113 ◽  
Author(s):  
Stephen L. Brusatte ◽  
Grzegorz Niedźwiedzki ◽  
Richard J. Butler
Keyword(s):  
Body Size ◽  
Mass Extinction ◽  
Middle Triassic ◽  
Large Body ◽  
Trace Fossils ◽  
Early Triassic ◽  
Large Body Size ◽  
Evolutionary Radiation ◽  
Stem Lineage ◽  
Early Middle Triassic

The ascent of dinosaurs in the Triassic is an exemplary evolutionary radiation, but the earliest phase of dinosaur history remains poorly understood. Body fossils of close dinosaur relatives are rare, but indicate that the dinosaur stem lineage (Dinosauromorpha) originated by the latest Anisian ( ca 242–244 Ma). Here, we report footprints from the Early–Middle Triassic of Poland, stratigraphically well constrained and identified using a conservative synapomorphy-based approach, which shifts the origin of the dinosaur stem lineage back to the Early Olenekian ( ca 249–251 Ma), approximately 5–9 Myr earlier than indicated by body fossils, earlier than demonstrated by previous footprint records, and just a few million years after the Permian/Triassic mass extinction (252.3 Ma). Dinosauromorph tracks are rare in all Polish assemblages, suggesting that these animals were minor faunal components. The oldest tracks are quadrupedal, a morphology uncommon among the earliest dinosauromorph body fossils, but bipedality and moderately large body size had arisen by the Early Anisian ( ca 246 Ma). Integrating trace fossils and body fossils demonstrates that the rise of dinosaurs was a drawn-out affair, perhaps initiated during recovery from the Permo-Triassic extinction.

Early and Middle Triassic trends in diversity, evenness, and size of foraminifers on a carbonate platform in south China: implications for tempo and mode of biotic recovery from the end-Permian mass extinction

Paleobiology ◽  
2011 ◽  
Vol 37 (3) ◽  
pp. 409-425 ◽  
Author(s):  
Jonathan L. Payne ◽  
Mindi Summers ◽  
Brianna L. Rego ◽  
Demir Altiner ◽  
Jiayong Wei ◽  
...  
Keyword(s):  
South China ◽  
Mass Extinction ◽  
Evolutionary Dynamics ◽  
Middle Triassic ◽  
Carbonate Platform ◽  
Early Triassic ◽  
Data Set ◽  
Recovery Pattern ◽  
Biotic Recovery ◽  
Permian Mass Extinction

Delayed biotic recovery from the end-Permian mass extinction has long been interpreted to result from environmental inhibition. Recently, evidence of more rapid recovery has begun to emerge, suggesting the role of environmental inhibition was previously overestimated. However, there have been few high-resolution taxonomic and ecological studies spanning the full Early and Middle Triassic recovery interval, leaving the precise pattern of recovery and underlying mechanisms poorly constrained. In this study, we document Early and Middle Triassic trends in taxonomic diversity, assemblage evenness, and size distribution of benthic foraminifers on an exceptionally exposed carbonate platform in south China. We observe gradual increases in all metrics through Early Triassic and earliest Middle Triassic time, with stable values reached early in the Anisian. There is little support in our data set for a substantial Early Triassic lag interval during the recovery of foraminifers or for a stepwise recovery pattern. The recovery pattern of foraminifers on the GBG corresponds well with available global data for this taxon and appears to parallel that of many benthic invertebrate clades. Early Triassic diversity increase in foraminifers was more gradual than in ammonoids and conodonts. However, foraminifers continued to increase in diversity, size, and evenness into Middle Triassic time, whereas diversity of ammonoids and conodonts declined. These contrasts suggest decoupling of recovery between benthic and pelagic environments; it is unclear whether these discrepancies reflect inherent contrasts in their evolutionary dynamics or the differential impact of Early Triassic ocean anoxia or associated environmental parameters on benthic ecosystems.

Permian–Triassic land-plant diversity in South China: Was there a mass extinction at the Permian/Triassic boundary?

Paleobiology ◽  
2011 ◽  
Vol 37 (1) ◽  
pp. 157-167 ◽  
Author(s):  
Conghui Xiong ◽  
Qi Wang
Keyword(s):  
South China ◽  
Mass Extinction ◽  
Middle Triassic ◽  
Land Plant ◽  
Land Plants ◽  
Late Triassic ◽  
Triassic Boundary ◽  
Permian Triassic Boundary ◽  
Diversity Dynamics ◽  
Early Middle Triassic

Diversity dynamics of the Permian–Triassic land plants in South China are studied by analyzing paleobotanical data. Our results indicate that the total diversity of land-plant megafossil genera and species across the Permian/Triassic boundary (PTB) of South China underwent a progressive decline from the early Late Permian (Wuchiapingian) to the Early-Middle Triassic. In contrast, the diversity of land-plant microfossil genera exhibited only a small fluctuation across the PTB of South China, showing an increase at the PTB. Overall, land plants across the PTB of South China show a greater stability in diversity dynamics than marine faunas. The highest extinction rate (90.91%) and the lowest origination rate (18.18%) of land-plant megafossil genera occurred at the early Early Triassic (Induan), but the temporal duration of the higher genus extinction rates (>60%) in land plants was about 23.4 Myr, from the Wuchiapingian to the early Middle Triassic (Anisian), which is longer than that of the coeval marine faunas (3–11 Myr). Moreover, the change of genus turnover rates in land-plant megafossils steadily fluctuated from the late Early Permian to the Late Triassic. More stable diversity and turnover rate as well as longer extinction duration suggest that land plants near the PTB of South China may have been involved in a gradual floral reorganization and evolutionary replacement rather than a mass extinction like those in the coeval marine faunas.

scholarly journals Ophiuroids from the Middle Triassic (Muschelkalk) of Sadowa Góra, Jaworzno (southern Poland)

2020 ◽  
Vol 46 (2) ◽  
pp. 175
Author(s):  
Dawid Surmik ◽  
Mariusz A. Salamon ◽  
Agnieszka Chećko ◽  
Karolina Kędroń
Keyword(s):  
Middle Triassic ◽  
Germanic Basin ◽  
Southern Poland

Ophiuroids belonging to Aspiduriella sp., Aspiduriella similis (Eck), and Arenorbis sp. are described from the Middle Triassic (Muschelkalk) strata of the Sadowa Góra Quarry (Jaworzno) in southern Poland. This is the only Polish location where three taxa of these ophiuroids have been found in one stratigraphic horizon (1st Wellenkalk). To date, only single taxa have been found in the Triassic sections of the eastern part of the Germanic Basin. Finally, other ophiuroid mass aggregations also known from Poland are presented.

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