Microbialite resurgence after the Late Ordovician extinction

  title={Microbialite resurgence after the Late Ordovician extinction},
  author={Peter M. F. Sheehan and Mark T. Harris},
Microbialites, including biogenic stromatolites, thrombolites and dendrolites, were formed by various microbial mats that trapped and bound sediments or formed the locus of mineral precipitation. Microbialites were common and diverse during the Proterozoic, but declined in abundance and morphological diversity when multicellular life diversified during the Cambrian Radiation. A second decline occurred during the Ordovician Radiation of marine animals, and from then until the present… 
Microbes and mass extinctions: paleoenvironmental distribution of microbialites during times of biotic crisis
The case for microbialites behaving as 'disaster forms' in the aftermath of mass extinctions accurately describes the response following the Late Devonian and end-Permian events, and this may be because each is marked by the reduction of reef communities in addition to a suppression of bioturbation related to the development of shallow-water anoxia.
The rise and fall of stromatolites in shallow marine environments
Stromatolites are abundant in shallow marine sediments deposited before the evolution of animals, but in the modern ocean they are restricted to locations where the activity of animals is limited.
Suppressed competitive exclusion enabled the proliferation of Permian/Triassic boundary microbialites
  • W. Foster, K. Heindel, J. Peckmann
  • Geography, Environmental Science
    The depositional record : a journal of biological, physical and geochemical sedimentary processes
  • 2020
It is inferred that the end‐Permian mass extinction event decreased the diversity and abundance of metazoans to the point of significantly reducing competition, allowing photosynthesis‐based microbial mats to flourish in shallow water settings and resulting in the formation of widespread microbialites.
Microbial mat controls on infaunal abundance and diversity in modern marine microbialites
This work provides support for the theory that certain Precambrian microbialites may have been havens of early complex metazoan life, rather than bereft of metazoans, as has been traditionally envisaged.
A Review on Microbialites: a Korean Perspective
Microbialites are defined as rocks formed by microbial organisms. After their first appearance around 3.5 billion years ago, microbialites occur in various depositional environments throughout
Two episodes of microbial change coupled with Permo/Triassic faunal mass extinction
A biomarker stratigraphic record showing episodic microbial changes coupled with a high-resolution record of invertebrate mass extinction across the Permo/Triassic boundary at Meishan in South China is presented.
A Late Silurian extinction event and anachronistic period
Resurgence of microbialites and anachronistic facies in the aftermath of Phanerozoic extinction events has hitherto only been documented among the "major five." Based on the classical Silurian
Patterns in Microbialites Throughout Geologic Time: Is the Present Really the Key to the Past?
Microbialites dominated the biosphere throughout the Proterozoic, becoming relatively rarer into the Phanerozoic. Microbialites are potential analogs of life on the early Earth; therefore,
Earliest Triassic microbialites in the South China block and other areas: controls on their growth and distribution
Earliest Triassic microbialites (ETMs) and inorganic carbonate crystal fans formed after the end-Permian mass extinction (ca. 251.4 Ma) within the basal Triassic Hindeodus parvus conodont zone. ETMs


Proterozoic stromatolites: The first marine evolutionary biota
Proterozoic stromatolites represent a Marine Evolutionary Biota, analogous to the three marine evolutionary faunas of the Phanerozoic that have been recognized on the basis of their characteristic
Stromatolites in Precambrian carbonates: evolutionary mileposts or environmental dipsticks?
Application of a process-based approach has shown that stromatolites were originally formed largely through in situ precipitation of laminae during Archean and older Proterozoic times, but that younger ProTerozoic strom atolites grew largely through the accretion of carbonate sediments, most likely through the physical process of microbial trapping and binding.
The Late Ordovician Mass Extinction
▪ Abstract Near the end of the Late Ordovician, in the first of five mass extinctions in the Phanerozoic, about 85% of marine species died. The cause was a brief glacial interval that produced two
The Great Ordovician Biodiversification Event
The Global Ordovician Biodiversification Event (GOBE) was undoubtedly one of the most significant evolutionary events in the history of the marine biosphere. A continuous increase in ichnodiversity
Links between the rise of the metazoa and the decline of stromatolites
Bathymetric and isotopic evidence for a short-lived Late Ordovician glaciation in a greenhouse period
The end Ordovician glaciation is distinct among Phanerozoic glaciations in that CO 2 , levels were generally high, yet major continental ice sheets accumulated on the Gondwana supercontinent. New
Shallow Marine Microbial Carbonate Deposits
In normal marine, shallow, subtidal carbonate settings, microbial communities that stabilize sediment to some degree are invariably present and typically are composed of a large variety of organisms,