Precambrian Columnar Stromatolite Diversity: Reflection of Metazoan Appearance

  title={Precambrian Columnar Stromatolite Diversity: Reflection of Metazoan Appearance},
  author={Stanley M. Awramik},
  pages={825 - 827}
  • S. Awramik
  • Published 19 November 1971
  • Environmental Science, Geography, Geology
  • Science
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. 
Stromatolite decline—A reconsideration
  • B. Pratt
  • Geography, Environmental Science
  • 1982
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 explained
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 microbial
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.
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: 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.
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 for
Prokaryotic and eukaryotic microfossils from a Proterozoic/Phanerozoic transition in China
Cherts of the Doushantuo Formation in the Yangtze Gorges, South China, contain a superbly preserved heterogeneous assemblage of bacteria, cyanobacteria, planktonic algae, submillimetre-sized burrows
Lower Ordovician Stromatolites from the Anhui Province of South China: Construction and Geobiological Significance
The Cambrian through Early Ordovician was a lengthy interval when microbialites once again dominated after their decline from a peak in the Middle Proterozoic (e.g., Riding 2006a). These
Revista Brasileira de Paleontologia
Here we catalog, for the first time, the known stromatolite-containing localities and morphologies found in outcrops previously attributed, by past mapping efforts, to the Lagoa do Jacaré Formation,


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.
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 thought
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.
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.
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.
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.
Cryptozoon and Associate Stromatolites from the Recent, Shark Bay, Western Australia
  • B. W. Logan
  • Environmental Science
    The Journal of Geology
  • 1961
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 to