Pal(a)eoPERCS

It's #PalaeoPercs day! Join us at 1600 UTC to learn more about the stratigraphy and sedimentology of Lower Permian carbonates with Daniel Calvo Gonzalez from Geological Survey of Canada!

If you have any questions or concerns, please let us know. We can't wait to see you on December 9th at 1600 UTC! #PalaeoPERCS
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Pal(a)eoPERCS Post by @palaeopercs.

If you would like to join our seminars, we also have a code of conduct which we expect *all* participants and speakers to adhere to. You can read the full code of conduct here: Code of Conduct – Pal(a)eoPERCS (paleopercs.com)
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The Early Permian (Asselian–Kungurian) witnessed the peak and collapse of the late Paleozoic ice age (LPIA). Its demise was coeval with rising pCO2atm from estimated pre-industrial levels in the earliest Asselian (peak-glaciation) to doubling today’s concentrations at the end of the Kungurian (post-glaciation). Sea-level fluctuations caused by the waxing and waning of ice sheets during peak glaciation are recorded in Asselian cyclothems. These transgressive-regressive sequences have been extensively studied but the amplitude in sea-level change they record remains unclear. The first part of this presentation will discuss the amplitude of eustatic fluctuations represented in cyclothems in New Mexico, Austria, and South China. Contemporaneous to the peak and collapse of the LPIA, an aridification and seasonality trend associated with intensifying monsoonal circulation began across most of Pangea. In South China, a shift towards warm and humid conditions had a profound impact on sedimentation of carbonate platforms adjacent to emerged areas. Enhanced coastal upwelling driven by intensified monsoonal circulation affected sedimentation of platforms outboard. The second part of this presentation will investigate the effect of warm and humid conditions in carbonate platforms of South China and enhanced coastal upwelling on areas at low latitude.

You can see Daniel's abstract here (with alt text):
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Next week at #PalaeoPERCS we will be joined by Daniel Calvo Gonzalez from Geological Survey of Canada, Canada.
Sign up here: paleopercs.com/participate/
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It's #PalaeoPercs day! Join us at 1600 UTC to learn more about tracing climate change through Alaskan glaciers with Laura Larocca from Arizona State University, USA!

It's #PalaeoPercs day! Join us at 1600 UTC to learn more about the Oligo-Miocene dolphin Squalodon with Margot Nelson from Calvert Marine Museum, USA!

If you have any questions or concerns, please let us know. We can't wait to see you on November 25th at 1600 UTC! #PalaeoPERCS
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Pal(a)eoPERCS Post by @palaeopercs.

If you would like to join our seminars, we also have a code of conduct which we expect *all* participants and speakers to adhere to. You can read the full code of conduct here: Code of Conduct – Pal(a)eoPERCS (paleopercs.com)
(3/4)

Taxonomic work is the backbone of vertebrate paleontology and provides crucial scaffolding for our understanding of a fossil’s place in nearly any aspect of science: its evolutionary relationships, its paleoecology, evolutionary trends, biogeographic dispersal, and functional morphology. Furthermore, taxonomy is important in democratizing paleontology, as it provides detailed anatomical descriptions, photographs, and even 3D scans of specimens some workers may never get to see in person. Fossils that do not get proper taxonomic treatment often go understudied. One example is the toothed whale family the Squalodontidae. Despite being a transitional form between the earliest aquatic whales and modern toothed whales, the taxonomic practices of the 19th century rendered the Squalodontidae a “wastebasket taxon” and it has taken over a century for this family to be extensively revisited. Findings reveal the real diversity of this family, their ecological niches, their evolutionary relationships, and the implications for trait evolution in toothed whales. The Squalodontidae highlight the importance of revisiting historic specimens in a modern light and the value of taxonomy in the study of deep time.

You can see Margot's abstract here (with alt text):
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Next week at #PalaeoPERCS we will be joined by Margot Nelson from Calvert Marine Museum, USA.
Sign up here: paleopercs.com/participate/
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It's #PalaeoPercs day! Join us at 1600 UTC to learn more about Palaeoichthyology with Gustavo A. Ballen from São Paulo State University, Brazil!

If you have any questions or concerns, please let us know. We can't wait to see you on November 18th at 1600 UTC! #PalaeoPERCS
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Pal(a)eoPERCS Post by @palaeopercs.

If you would like to join our seminars, we also have a code of conduct which we expect *all* participants and speakers to adhere to. You can read the full code of conduct here: Code of Conduct – Pal(a)eoPERCS (paleopercs.com)
(3/4)

Fossil vertebrates have been used in the literature as a source of information on past palaeogeographic settings in the Neotropics, although fishes have been less studied when compared to other groups such as mammals. Fishes and their fossil record are especially useful for studying past drainage and landmass configurations because of physical restriction to either freshwater or marine aquatic environment that most species present, and their comparatively limited dispersal capacities when compared to other vertebrate groups such as birds or large mammals. The goal of this presentation is to showcase the relevance of fossil fishes from Cenozoic strata in Northern South America to test hypotheses on palaeogeographic reconstructions, especially related to the timing of the Panama Isthmus closure, and the timing of drainage separation as a consequence of the Andean orogeny. We will discuss the implications of the freshwater fossil findings from the Castilletes, Sincelejo, and Ware Formations in Northern Colombia, in the middle Miocene to Pliocene time interval. We will also discuss the use of the fossil record in marine groups for calibrating molecular phylogenies and how this helps us understand the relationship between the Panama Isthmus closure and the evolution of Carangarian fishes. Finally, we will highlight how the need for statistical tools for better integrating and comparing information from the fossil record and molecular phylogenies have triggered the development and computational implementation of methods for estimating events in geological time, and to better use the available fossil record in divergence time estimation.

You can see Gustavo's abstract here (with alt text):
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Next week at #PalaeoPERCS we will be joined by Gustavo A. Ballen from São Paulo State University, Brazil.
Sign up here: paleopercs.com/participate/
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It's #PalaeoPercs day! Join us at 1000 UTC to learn more about stromatolites and research opportunities in China with Viplove Rajurkar from Tongji University, China!

If you have any questions or concerns, please let us know. We can't wait to see you on November 11th at 1000 UTC! #PalaeoPERCS
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Pal(a)eoPERCS Post by @palaeopercs.

If you would like to join our seminars, we also have a code of conduct which we expect *all* participants and speakers to adhere to. You can read the full code of conduct here: Code of Conduct – Pal(a)eoPERCS (paleopercs.com)
(3/4)

Stromatolites represent exceptional geochemical archives recording microbial metabolism and environmental evolution throughout Earth's history. High-resolution analytical techniques, particularly femtosecond laser ablation ICP-MS (FS-LA-ICP-MS), enable unprecedented micro-scale mapping of trace elements and isotopes within stromatolitic laminae. This seminar presents our integrated approach at Tongji University's Carbonate Geochemistry Laboratory, combining elemental mapping, rare earth element systematics, and redox-sensitive trace metals to reconstruct paleo-environmental conditions in Precambrian microbial habitats. Elemental maps reveal metal partitioning reflecting redox gradients, microbial processes, and diagenesis, while also guiding strategic sampling for isotope analysis and U-Pb dating where biostratigraphic markers are absent. Beyond scientific findings, this talk highlights collaborative research opportunities, funding mechanisms, and career pathways for early career researchers in China's dynamic geoscience community.

You can see Viplove's abstract here (with alt text):
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Next week at #PalaeoPERCS we will be joined by Viplove Rajurkar from Tongji University, China.
Sign up here: paleopercs.com/participate/
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It's #PalaeoPercs day! Join us at 1600 UTC to learn more about modern and historical timescales in shallow-marine habitats in the Bahamas with Liu Xianyi from Utrecht University, Netherlands!

If you have any questions or concerns, please let us know. We can't wait to see you on October 28th at 1600 UTC! #PalaeoPERCS
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Pal(a)eoPERCS Post by @palaeopercs.

If you would like to join our seminars, we also have a code of conduct which we expect *all* participants and speakers to adhere to. You can read the full code of conduct here: Code of Conduct – Pal(a)eoPERCS (paleopercs.com)
(3/4)

Tropical carbonate platforms are an important coastal ecosystem, comprising a series of shallow benthic habitats, including coral reefs, seagrass meadows, tidal flats and channels. The habitats on carbonate platforms are highly spatially heterogenous and dynamic. Assessing the change rate, change pattern, and understanding the causes of such changes (if there are any) is important, from both the ecological and geological points of view. However, the observations on the coastal systems have time biases: it either very short (few years) or very long (from cores, > 1000 years), and we lack observations acquired at an intermediate timescale (decades) to bridge habitat dynamics observed today with the rock records from the cores. In this study, we used one of the oldest aerial photos from 1945 to constrain the habitat dynamics and compare the habitat distributions with that of today.

You can see Liu's abstract here (with alt text):
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Next week at #PalaeoPERCS we will be joined by Liu Xianyi from Utrecht University, Netherlands.
Sign up here: paleopercs.com/participate/
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It's #PalaeoPercs day! Join us at 1500 UTC to learn more about mammalian evolution with Peter Bishop from Harvard University, United States!

If you have any questions or concerns, please let us know. We can't wait to see you on October 21st at 1500 UTC! #PalaeoPERCS
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Pal(a)eoPERCS Post by @palaeopercs.

If you would like to join our seminars, we also have a code of conduct which we expect *all* participants and speakers to adhere to. You can read the full code of conduct here: Code of Conduct – Pal(a)eoPERCS (paleopercs.com)
(3/4)

The origin of mammals involved major reorganization of the locomotor system, from ‘sprawling’ to ‘erect’ limb postures. Yet, despite a rich fossil record, how this shift was achieved has remained challenging to decipher. This talk will summarize recent efforts to integrate the fossil record of mammals and their non-mammalian synapsid ancestors with modern animal anatomy and computational biomechanics. These have helped clarify evolutionary patterns of anatomical transformation, and the timing of major functional shifts. A fully erect limb posture evolved much later than originally thought, well within crown-group mammals. Far from being an orderly, linear narrative, the sprawling-to-erect transition in synapsids is becoming understood as a highly complex, nonlinear, and protracted event.

You can see Peter's abstract here (with alt text):
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