Bilaterian Burrows and Grazing Behavior at >585 Million Years Ago

  title={Bilaterian Burrows and Grazing Behavior at >585 Million Years Ago},
  author={Ernesto Pecoits and Kurt O. Konhauser and Natalie R. Aubet and Larry M. Heaman and Gerardo Veroslavsky and Richard A. Stern and Murray K. Gingras},
  pages={1693 - 1696}
Early Burrowers Direct fossil evidence of animals from Ediacaran period—the time in Earth's history just before extensive animal diversification in the Cambrian—is scant. However, the remains of animal activity in sediment, which remain intact through geologic time can provide clues about animal behavior and evolution. Pecoits et al. (p. 1693; see the Perspective by Droser and Gehling) found a suite of fossil animal burrows in sedimentary rocks in Uruguay. Radiometric dating places the age of… 

Discovery of the oldest bilaterian from the Ediacaran of South Australia

The fossil Ikaria wariootia is described, one of the oldest bilaterians identified from South Australia, and it is found that the size and morphology of Ikaria match predictions for the progenitor of the trace fossil Helminthoidichnites—indicative of mobility and sediment displacement.

Ediacaran Ecosystems and the Dawn of Animals

Ichnology may provide remarkable information for our understanding of Ediacaran paleobiology, illuminating aspects such as the earliest evidence of bilaterians and the nature of Ediacaran ecosystems.

Old and Groovy

Furrowed, backfilled trace fossils dated to over 585 million years are described, which Pecoits et al. (3) interpret as the oldest bilaterian trace fossils and thus the oldest evidence of bilaterians.

At the Origin of Animals: The Revolutionary Cambrian Fossil Record

  • G. Budd
  • Geography, Geology
    Current genomics
  • 2013
Attention is now shifting to the period of time just before animals become common, at the base of the Cambrian and in the preceding Ediacaran Period.

Infaunal augurs of the Cambrian explosion: An Ediacaran trace fossil assemblage from Nevada, USA

The Dunfee assemblage records one of the oldest documented instances of sediment-penetrative infaunalization, corroborating previous molecular, ichnologic, and paleoecological data suggesting that crown-group bilaterians and bilaterian-style ecologies were present in late Ediacaran shallow marine ecosystems.

Ocean oxygenation in the wake of the Marinoan glaciation

The data provide evidence for an early Ediacaran oxygenation event, which pre-dates the previous estimates for post-Marinoan oxygenation by more than 50 million years, and seem to support a link between the most severe glaciations in Earth’s history, the oxygenation of the Earth's surface environments, and the earliest diversification of animals.


ABSTRACT Surface locomotory trace fossils from the Mistaken Point Formation of Newfoundland, dated at ∼ 565 Ma, suggest that organisms capable of controlled locomotion and possessing muscular tissue

The rise and early evolution of animals: where do we stand from a trace-fossil perspective?

Critical, systematic and comprehensive evaluation of the Ediacaran–Cambrian trace-fossil record and high-resolution integration of the ichnological dataset and sedimentological information show that the advent of biogenic mixing was an important factor in fully marine environments at the dawn of the Phanerozoic.

Ediacaran Marine Redox Heterogeneity and Early Animal Ecosystems

This study provides direct—rather than inferred—evidence that anoxia played a role in shaping a landmark Ediacaran ecosystem, if the anoxic conditions characteristic of the studied sections were widespread in the late Neoproterozoic, environmental stress would have hindered the development of complex ecosystems.



Possible animal-body fossils in pre-Marinoan limestones from South Australia

The Neoproterozoic era was punctuated by the Sturtian (about 710 million years ago) and Marinoan (about 635 million years ago) intervals of glaciation. In South Australia, the rocks left behind by

Fossil steroids record the appearance of Demospongiae during the Cryogenian period

It is suggested that shallow shelf waters in some late Cryogenian ocean basins contained dissolved oxygen in concentrations sufficient to support basal metazoan life at least 100 Myr before the rapid diversification of bilaterians during the Cambrian explosion.

The Ediacaran emergence of bilaterians: congruence between the genetic and the geological fossil records

The two historical records of life both suggest that although the cradle of Metazoa lies in the Cryogenian, and despite the explosion of ecology that occurs in the Cambrian, it is the emergence of bilaterian taxa in the Ediacaran that sets the tempo and mode of macroevolution for the remainder of geological time.

First evidence for locomotion in the Ediacara biota from the 565 Ma Mistaken Point Formation, Newfoundland

Evidence for locomotion in the Precambrian fossil record is scant. Reliable Ediacaran trace fossils are all younger than 560 Ma, and consist of relatively simple horizontal burrows and trails from

Neonereites uniserialis from c. 600 Ma year old rocks in western Scotland and the emergence of animals

A chain of pellets (Neonereites uniserialis), usually attributed to a coelomate or pseudocoelomate metazoan, is described from the middle Dalradian Bonahaven Formation of western Scotland, in

Pulsed oxidation and biological evolution in the Ediacaran Doushantuo Formation

High-resolution geochemical data from the fossil-rich Doushantuo Formation in South China are reported that confirm trends from other broadly equivalent sections and highlight key features that have not been observed in most sections or have received little attention.

THE EDIACARA BIOTA: Neoproterozoic Origin of Animals and Their Ecosystems

Present evidence suggests that the Ediacara biota included a mixture of stem- and crown-group radial animals, stem-group bilaterian animals, “failed experiments” in animal evolution, and perhaps representatives of other eukaryotic kingdoms.

The Paleoproterozoic megascopic Stirling biota

Abstract The 2.0–1.8-billion-year-old Stirling Range Formation in southwestern Australia preserves the deposits of a siliciclastic shoreline formed under the influence of storms, longshore currents,