Systematic ichnology of the Late Ordovician Georgian Bay formation of southern Ontario, eastern Canada

Stanley, D. Christpher A.; Pickerill, Ron K.

doi:10.5962/bhl.title.53483

Cited by 15 publications

(14 citation statements)

References 25 publications

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“…Rindsberg (1994) restricted only surface traces to Cochlichnus, and the subsurface forms included in a new ichnogenus Cymatulus. This idea was criticized by Stanley and Pickerill (1998) who regarded Cymatulus as a junior synonym of Cochlichnus.…”

Section: Synopsis Of Trace Fossilsmentioning

confidence: 96%

Trace fossils from the Upper Pleistocene glaciolacustrine laminated sediments of Lithuania

Uchman

Gaigalas

Kazakauskas³

2008

Geologija

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Detailed studies of trace fossils have been carried out in five sections of glaciolacustrine varved sediments (Balbieriškis 2 and 3 outcrops, clay pits of Pašaminė, Krūna and Tauragė). Trace fossils gor dia isp., Helminthoidichnites isp. and galaciichnium liebegastensis are relatively common, and Coch lichnus anguineus, Warvichnium ulbrichi and curved ridges are rare. These trace fossils are typical of the Mermia ichnofacies. Their occurrence is related to the warmer climate of the Late Pleistocene North European glacial interphasials or interoscillations. The trace fossils can be used for recognition of lacustrine subfacies and climatic warming.

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Section: Synopsis Of Trace Fossilsmentioning

confidence: 96%

Trace fossils from the Upper Pleistocene glaciolacustrine laminated sediments of Lithuania

Uchman

Gaigalas

Kazakauskas³

2008

Geologija

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“…The subsurface forms have been distinguished by the latter author as a new ichnogenus Cymatulus. However, Stanley & Pickerill (1998) argued that the distinction is very subtle and regarded Cymatulus a junior synonym of Cochlichnus. The here described forms are all epichnial grooves, thus their casts belong to Cochlichnus HITCHCOCK.…”

Section: Invertebrate Trace Fossilsmentioning

confidence: 99%

“…Specimens of C. anguineus that display the same or very similar features are included in the synonymy list. Forms of C. anguineus from marine or brackish settings are larger (see Stanley & Pickerill 1998, and references therein). The ratio wavelength to amplitude displays three peaks (Fig.…”

Section: Invertebrate Trace Fossilsmentioning

confidence: 99%

Oligocene trace fossils from temporary fluvial plain ponds: An example from the Freshwater Molasse of Switzerland

Uchman

Pika-Biolzi

Hochuli

2004

Eclogae geol. Helv.

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Numerous invertebrate trace fossils and small rare vertebrate tracks are reported and described from the Upper Oligocene deposits of the Lower Freshwater Molasse in eastern Switzerland. They are commonly accompanied by mud-cracks, raindrops, and plant remains, mostly leaves. The invertebrate trace fossils were produced by different animals, mostly insect larvae, nematodes, and probably by molluscs, in desiccating pools on a fluvial plain of a braided river. The trace fossil assemblage differs from the Scoyenia ichnofacies which is typical for terrestrial fluvial plain environment. Instead, it resembles the impoverished Mermia ichnofacies which is probably common but poorly known in this environment. This ichnofacies corresponds to a low energy environment, most probably to fluvial plain ponds. ZUSAMMENFASSUNGAus der oberoligozänen Süsswasser-Molasse der Ostschweiz werden zahlreiche Spurenfossilien von Invertebraten und einige Spuren kleiner Vertebraten beschrieben. Diese Spuren sind häufig mit Trockenrissen, Abdrücken von Regentropfen und Pflanzenresten, vor allem Blättern, assoziiert. Verschiedene Organismen, meist Insektenlarven, Nematoden und möglicherweise Mollusken, haben die Invertebraten-Spuren in austrocknenden Tümpeln auf einer Schwemmlandebene hinterlassen. Die beschriebene Assoziation von Spurenfossilien unterscheidet sich von der Scoyenia Ichnofazies, die für Ablagerungen im Bereich von Schwemmlandebenen typisch ist. Statt dessen gleicht sie einer verarmten Mermia Ichnofazies, die aus diesem Ablagerungsraum wenig bekannt ist, aber wahrscheinlich häufig auftritt. Diese Ichnofazies entspricht einem Ablagerungsraum geringer Energie, wie er in Tümpeln auf einer Flussebene vorkommt.

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“…Functional analysis of the morphology of the type species of Isotelus, I. gigas, has led to suggestions that larger holaspids were likely predator/scavengers Owens 1999a, 1999b) and may have buried themselves in bottom sediments with only the eyes and more elevated axial parts of the exoskeleton exposed (Rudkin and Tripp, 1989). These suppositions are supported by shallow Rusophycus-type resting traces showing ventral impres sions of large isoteline trilobites from a number of Late Ordovi cian sequences in North America (Osgood, 1970;Stanley and Pickerill, 1998). Large distinctive trace fossils are also found in close association with, and have previously been attributed to, the giant Isotelus in the Churchill River Group of northern Manitoba (Johnson et al, 1988 , fig.…”

Section: Paleobiological and Autecological Considerationsmentioning

confidence: 84%

The world's biggest trilobite—Isotelus rexnew species from the upper Ordovician of northern Manitoba, Canada

Rudkin

Young²,

Elias

et al. 2003

J. Paleontol.

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The largest known trilobite fossil, a virtually complete articulated dorsal shield of the asaphid Isotelus rex new species, has been recovered from Upper Ordovician (Cincinnatian, Richmondian) nearshore carbonates of the Churchill River Group in northern Manitoba. At over 700 mm in length, it is almost 70 percent longer than the largest previously documented complete trilobite, and provides the first unequivocal evidence of maximum trilobite length in excess of one-half metre. Comparisons with other fossil and extant members of the phylum suggest that in terms of maximum linear dimensions it was among the biggest arthropods ever to have lived. Sediments of the Churchill River Group were deposited in an equatorial epeiric setting and the extremely large size of I. rex n. sp. thus marks a striking example of low-latitude gigantism, in sharp contrast to the widespread phenomenon of “polar gigantism” in many modern marine benthic arthropods. Lack of extensive epibiontic colonization of the exoskeletal surface and the presence of large distinctive trace fossils in the same unit suggest that I. rex n. sp. may have been a semi-infaunal predator and scavenger that employed a shallow furrowing and probing mode of benthic feeding. The extinction of the isotelines (and virtually the entire asaphide lineage) at the end of the Ordovician cannot be related to the near contemporaneous achievement of exceptionally large adult size in some representatives. Failure to survive the terminal Ordovician extinction event was most likely a consequence of a pelagic larval life-style that proved ill-adapted to the rapid onset of global climatic cooling and loss of tropical shelf habitats.

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Systematic ichnology of the Late Ordovician Georgian Bay formation of southern Ontario, eastern Canada

Cited by 15 publications

References 25 publications

Trace fossils from the Upper Pleistocene glaciolacustrine laminated sediments of Lithuania

Trace fossils from the Upper Pleistocene glaciolacustrine laminated sediments of Lithuania

Oligocene trace fossils from temporary fluvial plain ponds: An example from the Freshwater Molasse of Switzerland

The world's biggest trilobite—Isotelus rexnew species from the upper Ordovician of northern Manitoba, Canada

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