Precambrian Columnar Stromatolite Diversity: Reflection of Metazoan Appearance

  title={Precambrian Columnar Stromatolite Diversity: Reflection of Metazoan Appearance},
  author={S. Awramik},
  pages={825 - 827}
Columnar stromatolites (organosedimentary structures built by bluegreen algae) show a marked decrease in diversity in the Late Precambrian; this decrease in diversity occurs at approximately the same time as the appearance of metazoans, 600 to 700 million years ago. 

Topics from this paper

Stromatolite decline—A reconsideration
The prevailing concept of Phanerozoic stromatolite decline is considered too simplistic. Changes in stromatolite character and proportion to other lithologies after the Precambrian can be explainedExpand
Christmas Tree Stromatolite
What causes the unique shape of the Christmas tree stromatolite Jacutophyton? Branching in Jacutophyton appears to be controlled by both shade avoidance and by metazoan perturbation of the microbialExpand
Modern Stromatolites: A Review
Stromatolites comprise a wide spectrum of various, laminated and nonlaminated organosedimentary structures that form in various marine and freshwater habitats, often leaving marks of their particular activities. Expand
Microfossils in Conophyton from the Soviet Union and Their Bearing on Precambrian Biostratigraphy
Silicified specimens of the Vendian (late Precambrian) "index fossil" Conophyton gaubitza from South Kazakstan contain a diverse assemblage of well-preserved cyanophytic and apparently eukaryoticExpand
Archaean and Proterozoic Stromatolites
The approximately 3400-million-year history of the Archaean and Proterozoic Eons is rich in the fossil remains of organosedimentary structures called stromatolites, built primarily by cyanobacteria.Expand
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 characteristicExpand
Most of the authors' understanding of evolutionary events before the appearance of Metaphyta and Metazoa is based on the detailed study of microfossils found in cherts, but very little has been added to this understanding using the other great class of pre-Phanerozoic fossils–the stromatolites. Expand
The Stromatolite Archaeozoon acadiense from the Proterozoic Green Head Group of Saint John, New Brunswick
The columnar branching stromatolite Archaeozoon acadiense Matthew 1890 occurs in platy fault-slivers of a biohermal or biostromal limestone that accumulated on a shallow submerged platform, possiblyExpand
Stromatolites: Yellowstone Analogues
Stromatolites are important types of geological structures, found primarily in the Precambrian Era, but present to lesser extent throughout the rest of earth history up until the present.Expand
Protracted development of bioturbation through the early Palaeozoic Era
Mobile organisms first appeared in the fossil record prior to the Precambrian–Cambrian transition. Sediment textures indicate that the degree of sediment mixing by animal activity remained low forExpand


Phanerozoic Stromatolites: Noncompetitive Ecologic Restriction by Grazing and Burrowing Animals
The abundance of stromatolites (algal laminated sedimentary structures) in the Precambrian followed by a decline in the Phanerozoic is explained by the evolution and diversification during theExpand
Precambrian Columnar Stromatolites in Australia: Morphological and Stratigraphic Analysis
The stratigraphic distribution in Australian Precambrian rocks of columnar stromatolites, organosedimentary structures formed by blue-green algae, has been investigated and the discovery of successive different assemblages supports not only regional but also intercontinental stratigraphy correlations which are in agreement with available isotopic datings. Expand
Stromatolites and oncolites in the Otavi series, South-West Africa
ABSTRACT The dolomite beds of the Otavi Series are unusually rich in stromatolites and oncolites. Individual reefs contain varied composite forms dictated by local paleo-environment. It is thoughtExpand
Phanerozoic-Cryptozoic and Related Transitions: New Evidence
The fossil Pteridinium, a distinctive component of a worldwide early metazoan (Ediacaran)assemblage, is provisionally recorded from probable early Cambrian strata in eastern California, implying a Cambrian age for the Ediacaran fauna and approximate coincidence of limits between Phanerozoic-Cryptozoic, Paleozoic-Precambrian, and Cambrian-PreCambrian. Expand
Late Precambrian (?) Fossils from Southeastern Newfoundland
Fossils of the Precambrian Conception Group in the Biscay Bay—Cape Race area, southeastern Newfoundland, are found as hundreds of imprints on the top surfaces of the graded beds of turbidite origin.Expand
Geographic Distribution and Time Range of the Ediacara Precambrian Fauna
Occurrences of elements of the Ediacara fauna are known from ten different areas from strata of late Precambrian age. Those that have been dated isotopically are reported to be about 600 to 700 m. y.Expand
Cryptozoon and Associate Stromatolites from the Recent, Shark Bay, Western Australia
Stromatolitic sediments and structures resembling Cryptozoon and Collenia are presently forming in the bay-head environment at Shark Bay, Western Australia. Algal-laminated sediments are due toExpand
Classification and Environmental Significance of Algal Stromatolites
Stromatolites are laminated structures that have been previously termed fossil algae. It is now recognized that such structures may be formed by a number of different processes and organisms.Expand
Since Darwin’s time the total number of recorded fossils has grown enormously, and so has their importance as documents of the real history of the organic world. Many previously missing links in theExpand