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The discussions demonstrate interest through mentions of complex geological processes, such as sediment subduction and erosion, and debates about the reliability of fossil versus molecular evidence. The tone varies from curiosity to cautious agreement, reflecting ongoing scientific exploration and acknowledgment of unresolved questions about early animal origins.
Most comments acknowledge the complexity and partial reconciliation between molecular data and fossil evidence, showing a mild consensus.
Discussions are highly engaged with the topic, touching on multiple aspects like fossil preservation and geological events.
Posts reference specific processes such as sediment erosion, tectonics, and fossil record limitations, indicating active engagement.
The discussions highlight the ongoing debate and implications for understanding animal origins, suggesting moderate impact on field understanding.
https://t.co/xSzzd0OEkc https://t.co/J9G4FCDNw2 https://t.co/ivnTPlhIJi https://t.co/UN1P4kI7Wv https://t.co/o3PtSBhokN https://t.co/adCAlbXwjJ https://t.co/Kd3r9a5Fpz https://t.co/rBerPMW8bA
New thinking. “Although quantitative studies have yet to be undertaken in the Precambrian, it is clear that the rock record from the critical interval around the Precambrian‐Cambrian boundary is less complete than we might like.” https://t.co/T1HZ7wCQVN
New thinking. “This “Great Unconformity” records a prolonged period of continental denudation in the latest Neoproterozoic followed by a major marine transgression, suggesting that many latest Ediacaran shallow‐marine rock sequences.” https://t.co/T1HZ7wCQVN
Plate tectonic reconstructions: “much of the remaining sediment deposited during the latest Precambrian and Early Cambrian would have been subducted or accreted and destroyed at the Delamerian‐Ross subduction zone, which initiated in the Cambrian.” https://t.co/T1HZ7wCQVN
“The apparent absence of a fossil record prior to the appearance of trilobites in the Cambrian famously troubled Darwin.“ https://t.co/T1HZ7wCQVN
Darwin. “He could give “no satisfactory answer” as to why older fossiliferous deposits had not been found.” https://t.co/T1HZ7wCQVN
This video discusses how molecular clock estimates and the fossil record are converging in understanding the origin and early diversification of animals, highlighting recent analyses that reconcile previous…
Scientists are exploring the unclear origins of eukaryotes, potentially linked to Asgard archaea. This video delves into the isolation of ‘Candidatus Prometheoarchaeum syntrophicum’ from deep marine sediment and its…
https://t.co/xSzzd0OEkc https://t.co/J9G4FCDNw2 https://t.co/ivnTPlhIJi https://t.co/UN1P4kI7Wv https://t.co/o3PtSBhokN https://t.co/adCAlbXwjJ https://t.co/Kd3r9a5Fpz https://t.co/rBerPMW8bA
@TenFleming " A considerable discrepancy remains, but much of this can be explained by the limited preservation potential of early metazoans and the difficulties associated with their identification in the fossil record. " https://t.co/ey2BEi0eGj
Plate tectonic reconstructions: “much of the remaining sediment deposited during the latest Precambrian and Early Cambrian would have been subducted or accreted and destroyed at the Delamerian‐Ross subduction zone, which initiated in the Cambrian.” https://t.co/T1HZ7wCQVN
New thinking. “Many latest Ediacaran shallow‐marine rock sequences – reflecting environments that may be expected to contain the highest diversity of animal life – have been eroded away.” https://t.co/T1HZ7wCQVN
New thinking. “This “Great Unconformity” records a prolonged period of continental denudation in the latest Neoproterozoic followed by a major marine transgression, suggesting that many latest Ediacaran shallow‐marine rock sequences.” https://t.co/T1HZ7wCQVN
New thinking. “In many localities around the world, shallow‐marine Cambrian or Ordovician rocks lie unconformably above Precambrian rocks.“ https://t.co/T1HZ7wCQVN
New thinking. “Although quantitative studies have yet to be undertaken in the Precambrian, it is clear that the rock record from the critical interval around the Precambrian‐Cambrian boundary is less complete than we might like.” https://t.co/T1HZ7wCQVN
“This body fossil record is at odds with molecular clock analyses, which consistently indicate that Metazoa originated somewhere between 850 and 650 Ma in the Tonian or Cryogenian intervals, before diversifying through the Cryogenian and the Ediacaran.” https://t.co/T1HZ7wCQVN
The dogma. “Fig. 1 summarizes major Ediacaran and early Cambrian fossil assemblages.” https://t.co/T1HZ7wCQVN
The dogma. “By around 520 Ma, virtually all of the animal phyla with recalcitrant tissues that one might expect to become fossilized are represented in the fossil record, as revealed by Lagerstätten such as the exceptionally preserved Chengjiang biota 4.” https://t.co/T1HZ7wCQVN
The dogma. “The conventional interpretation of the metazoan body fossil record is that it documents an abrupt...appearance of animals around the base of the Cambrian Period 541 million years ago (Ma) – the “Cambrian Explosion” hypothesis.“ https://t.co/T1HZ7wCQVN
“Darwin's dilemma” regarding the origin and early evolution of Metazoa arguably persists, because incontrovertible fossil evidence for animals remains largely, or some might say completely, absent from Neoproterozoic rocks.” https://t.co/T1HZ7wCQVN
Darwin. “He could give “no satisfactory answer” as to why older fossiliferous deposits had not been found.” https://t.co/T1HZ7wCQVN
“The apparent absence of a fossil record prior to the appearance of trilobites in the Cambrian famously troubled Darwin.“ https://t.co/T1HZ7wCQVN
The origin of animals: Can molecular clocks and the fossil record be reconciled? http://onlinelibrary.wiley.com/doi/10.1002/bies.201600120/abstract
DOI: 10.1002/bies.201600120. Darroch SAF, Smith EF, Laflamme M, Erwin DH 2018. Ediacaran Extinction and Cambrian Explosion. Trends in ...
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