Trace Fossils of a Middle to Upper Ordovician Pelagic Deep-Ocean Bedded Chert in Southeastern Australia

2007 ◽  
Author(s):  
Yoshitaka Kakuwa ◽  
John Webb
Keyword(s):  
Deep Ocean ◽  
Trace Fossils ◽  
Upper Ordovician ◽  
Southeastern Australia ◽  
Bedded Chert

scholarly journals Early complex tiering pattern: Upper Ordovician, Barrandian area, the Czech Republic

2021 ◽  
Vol 77 (1) ◽  
pp. 17-35
Author(s):  
Pavel Bokr ◽  
Radek Mikuláš ◽  
Petr Budil ◽  
Petr Kraft
Keyword(s):  
Czech Republic ◽  
Trace Fossils ◽  
Preferred Orientation ◽  
Upper Ordovician ◽  
The Czech Republic ◽  
Shallow Marine ◽  
Fine Grained ◽  
Bedding Planes ◽  
Barrandian Area

Upper Ordovician shallow marine fine-grained sandstones and siltstones exposed in the Loděnice – vinice locality yielded a distinct and well-preserved tiering pattern of trace fossils. The two uppermost tiers are composed mainly of Bifungites and Nereites. Deeper in the sediment, tiers dominated by Thalassinoides, Zoophycos and Teichichnus occur. Most of the succession is completely bioturbated; however, several storm layers enabled study of a well-preserved frozen tiering pattern. Large portions of the bedding planes (ichnologic snapshots) showed a considerable patchiness of intensive surface bioturbation and a preferred orientation of Bifungites. The identified tiering pattern is one of the earliest examples of a well-documented complex tiering of burrows documented in detail.

scholarly journals Onshore-offshore patterns in Late PreCambrian and Lower Palaeozoic trace fossils

1992 ◽  
Vol 6 ◽  
pp. 77-77
Author(s):  
T. Peter Crimes ◽  
N. Chris Hunt
Keyword(s):  
Shallow Water ◽  
Deep Water ◽  
Lower Cambrian ◽  
Deep Ocean ◽  
Trace Fossils ◽  
Virtual Absence ◽  
Shelf Seas ◽  
Lower Palaeozoic ◽  
Abundance And Diversity ◽  
Body Fossil

There was a dramatic increase in abundance and diversity of trace fossils in Upper Precambrian and Lower Cambrian shallow water seas. The trace-producing animals rapidly filled all the available niches and in low energy, muddy, environments they evolved winding, meandering and patterned habits. Traces such as Taphrhelminthopsis, Helminthoida, Nereites, Paleodictyon and Squamodictyon had all evolved in clastic shelf seas during the pre-trilobite Lower Cambrian.Significant colonisation of the deep oceans seems to have mostly been delayed until the Ordovician. A recently described suite of trace fossils from a flysch sequence in Eire includes such deep water types as: Glockerichnus, Helminthopsis, Lorenzinia, Paleodictyon and Taphrhelminthopsis. This migration into the deep sea is accompanied by a virtual absence of such traces from shallow water sequences after the Cambrian.Deep water trace fossils therefore seem to have evolved initially in shallow water clastic seas and then migrated in to the deep ocean, thereby providing an exciting example of an onshore-offshore pattern. This may be of particular significance in that it is presumably mimicked by body fossil migrations in these early seas.

Upper Ordovician marine red limestones, Tarim Basin, NW China: A product of an oxygenated deep ocean and changing climate?

2019 ◽  
Vol 183 ◽  
pp. 103032 ◽  
Author(s):  
Mu Liu ◽  
Daizhao Chen ◽  
Xiqiang Zhou ◽  
Dongjie Tang ◽  
Theodore R. Them ◽  
...  
Keyword(s):  
Tarim Basin ◽  
Deep Ocean ◽  
Upper Ordovician ◽  
Nw China ◽  
Changing Climate

Morphometric analysis of graphoglyptid trace fossils in two dimensions: implications for behavioral evolution in the deep sea

Paleobiology ◽  
2016 ◽  
Vol 42 (2) ◽  
pp. 317-334 ◽  
Author(s):  
James R. Lehane ◽  
A. A. Ekdale
Keyword(s):  
Late Cretaceous ◽  
Deep Ocean ◽  
Trace Fossils ◽  
Two Dimensions ◽  
Sudden Increase ◽  
Behavioral Evolution ◽  
Evolutionary Patterns ◽  
Evolutionary Changes ◽  
The Times ◽  
Over Time

AbstractGraphoglyptids are deep-marine trace fossils, often found preserved as casts in positive relief on the base of turbidites. Previous analyses of the behavioral evolution of graphoglyptids suggested they were slowly diversifying, becoming optimized, and getting smaller over time until the Late Cretaceous, when a sudden increase in diversification occurred. This current study quantifies the morphology of approximately 400 different graphoglyptid specimens, ranging in age from the Cambrian to the present, in order to evaluate the behavioral evolutionary interpretations made previously. Results from this study indicate that although some general evolutionary patterns can be discerned, they are not as straightforward as previously reported.Different topological categories of trace fossils represent organisms’ responses to evolutionary pressures in unique ways. While burrow widths of meandering traces were becoming smaller over time, as predicted by previous workers, the burrow widths of the network traces were becoming smaller only until the Late Cretaceous, when they started to get larger again. The times of significant evolutionary changes in behavior were not consistent among various topological categories, with some morphological features being affected in the Late Cretaceous and others during the beginning of the Eocene. It is likely that the behavioral evolution of graphoglyptids was influenced by deep-marine global influences linked to climate change, glaciation, and deep-ocean warming. These influences affected each topological group uniquely, suggesting that different species or genera of trace makers were creating each of the topological categories. This is contrary to the hypothesis that all graphoglyptids were created by closely related species.

Pliocene and earlier Pleistocene marsupial evolution in southeastern Australia

2006 ◽  
Vol 31 ◽  
pp. 313-322 ◽  
Author(s):  
Richard Tedford ◽  
Rod Wells ◽  
Gavin Prideaux
Keyword(s):  
Southeastern Australia
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