scholarly journals Trace Fossils and Sulfur Isotopes in Mudstones around the Kuroko Deposits in the Hokuroku Basin, Northeast Japan: An Attempt to Delineate the Depositional Environment

2004 ◽  
Vol 54 (4) ◽  
pp. 425-436 ◽  
Author(s):  
Kosei Komuro ◽  
Hiroshi Kubota ◽  
Tokiyuki Sato ◽  
Yoshimichi Kajiwara ◽  
Shojiro Tanimura
Keyword(s):  
Depositional Environment ◽  
Sulfur Isotopes ◽  
Trace Fossils ◽  
Kuroko Deposits

Sedilichnus, Oichnus, Fossichnus, andTremichnus: ‘Small Round Holes in Shells’ Revisited

2014 ◽  
Vol 88 (5) ◽  
pp. 895-905 ◽  
Author(s):  
John-Paul Zonneveld ◽  
Murray K. Gingras
Keyword(s):  
Depositional Environment ◽  
A Priori ◽  
Trace Fossils ◽  
Junior Synonym ◽  
Inner Shelf ◽  
Morphological Criteria ◽  
Skeletal Material ◽  
End Members

Small round pits and holes in fossil skeletal material are found in a wide variety of invertebrate substrates from diverse environmental settings. They are associated with parasitism, predation and commensal attachment. Four ichnogenera have been proposed for these trace fossils:SedilichnusMüller,OichnusBromley,TremichnusBrett andFossichnusNielsen, Nielsen and Bromley. Previous authors have established thatTremichnusis a junior synonym ofOichnus. Herein we show thatOichnusandFossichnusare junior synonyms ofSedilichnus.Sedilichnus, as defined herein, includes 10 ichnospecies.Sedilichnus spongiophilus, S. simplex, S. paraboloides, S. ovalis, S. coronatus, S. gradatus, S. halo, S. asperus, S. excavatusandS. solus. Consistent with previous workSedilichnusichnospecies are defined solely by morphological criteria and not by a priori assumptions regarding depositional environment or tracemaker. Thus, this ichnotaxon is recognized in both marine and continental settings on a wide variety of invertebrate skeletal tests. As is true with many ichnotaxa,Sedilichnusichnospecies represent end-members in morphological spectra, however each ichnospecies is clearly differentiable from the others.Sedilichnus spongiophilusare circular, non-penetrative pits in shells.Sedilichnus paraboloidesare penetrative holes with spherical paraboloid forms and typically have larger external openings and smaller internal openings.Sedilichnus simplexare simple cylindrical borings that have both penetrative and non-penetrative forms.Sedilichnus coronatusdiffer from other forms by the presence of an etched or granular halo surrounding the boring.Sedilichnus gradatushave two concentric parts, an outer boring and an inner shelf of smaller diameter.Sedilichnus ovalisandS. asperusare both oval in outline differing in the presence of tapering paraboloid margins inS. ovalisand margins perpendicular to the substrate inS. asperus.Sedilichnus excavatusandS. solusare primarily non-penetrative and differ from otherSedilichnusby the presence of central, raised bosses or platforms. These two ichnospecies differ in the shapes of their external walls and the proportional thickness of the bounding groove.

Devonian depositional environments in the Darwin Mountains: Marine or non-marine?

1993 ◽  
Vol 5 (2) ◽  
pp. 211-220 ◽  
Author(s):  
Ken J. Woolfe
Keyword(s):  
Fresh Water ◽  
Depositional Environment ◽  
Trace Fossils ◽  
Depositional Environments ◽  
Trace Fossil ◽  
Glacier Area ◽  
Red Beds ◽  
Fossil Assemblage ◽  
Considerable Debate

The depositional environment of the Devonian Taylor Group has been subject to considerable debate for over 30 years. The debate stems largely from a belief that the abundant and diverse trace fossils represent a marine ichnofauna, whereas sedimentary features, including palaeosols, desiccation polygons and red beds, are more typical of a non-marine setting. The debate is reconciled by a reinterpretation of the trace fossil assemblage which shows that the trace fossils comprise a typical fresh water (Scoyenia ichnofacies) assemblage, and their occurrence in the Taylor Group in the Darwin Glacier area is entirely consistent with deposition in a mixed fluvial-lacustrine-subaerial environment.

Isopodichnus, related arthropod trace fossils and notostracans from Triassic fluvial sediments

1985 ◽  
Vol 76 (2-3) ◽  
pp. 273-285 ◽  
Author(s):  
J. E. Pollard
Keyword(s):  
Depositional Environment ◽  
Lower Triassic ◽  
Trace Fossils ◽  
Size Frequency Distribution ◽  
Structured Population ◽  
Size Frequency ◽  
Triops Cancriformis ◽  
Age Structured ◽  
Body Fossil ◽  
Taxonomic Consideration

ABSTRACTThe commonest arthropod trace fossils from Triassic aquatic red beds are the bilobate traces Isopodichnus and trackways known as ‘Merostomichnites’ triassicus. These trace fossils were probably produced by notostracan branchiopods, similar to Triops. Four arthropod ichnocoenoses from Lower Triassic fluvial sandstones have been analysed in terms of size frequency distribution, behavioural variation and relationship to sedimentary structures and depositional environment. One Isopodichnus ichnofauna associated with flute moulds (Dumfries-shire, Scotland) shows a normal age-structured population of arthropods responding with strong rheotaxis within shallow fluvial channels. The second Isopodichnus assemblage associated with ripple marks (Worcestershire, England) also shows strong rheotaxis but is bimodal in size and morphotype, possibly suggesting change in arthropod behaviour with age. Two ichnocoenoses of trackways with less pronounced rheotaxis associated with ripples (Cheshire, England) and flute moulds (Württemberg, Germany) were produced by larger arthropods than the resting traces. These arthropods probably possessed 6 to 9 pairs of walking limbs.The conclusions derived from these notostracan trace fossils are compared with data on palaeoecology, population size-frequency, morphology and behaviour of Triops cancriformis derived from the analysis of three Triassic body fossil faunas and literature on living populations. Taxonomic consideration favours retention of the name Isopodichnus but the trackways should be included in Acripes Matthew. Brief review of late Palaeozoic Isopodichnus assemblages which appear to predate known notostracan fossils is inconclusive as regards both identifying producers or infallible means of separation from Cruziana assemblages.

First report of fish trace fossils (Undichna) from the Middle Devonian Achanarras Limestone, Caithness Flagstone Group

2021 ◽  
pp. sjg2020-023
Author(s):  
Benjamin H. Tindal ◽  
Anthony P. Shillito ◽  
Neil S. Davies
Keyword(s):  
Middle Devonian ◽  
Depositional Environment ◽  
Trace Fossils ◽  
Early Career ◽  
Low Oxygen ◽  
Fish Swimming ◽  
Content Type ◽  
Fish Locomotion ◽  
Research Collection ◽  
Career Research

Two newly-discovered specimens of the fish locomotion trace Undichna (U. britannica and Undichna isp.), are described from the Middle Devonian Achanarras Limestone Member (Caithness Flagstone Group, NE Scotland). Fish trace fossils have not previously been reported from the Achanarras Limestone Member, despite decades of study of the unit as a key locality for fish body fossils. The traces comprise discontinuous sinusoidal grooves; one showing multiple parallel incisions, created by the fins of an acanthodian fish swimming close to the substrate. The apparent absence of trace fossils attributable to infaunal or epifaunal benthic organisms suggests that the sediment at the bottom of the lake was relatively inhospitable. The low ichnodiversity of the Achanarras Limestone Member is likely due to low oxygen levels in the depositional environment.Thematic collection: This article is part of the Early Career Research collection available at: https://www.lyellcollection.org/cc/SJG-early-career-research

Studi Mekanisme Sedimentasi Formasi Dolokapa, Gorontalo

2021 ◽  
Vol 3 (2) ◽  
pp. 97-111
Author(s):  
Tedy Harianto Salama ◽  
Sri Maryati ◽  
Intan Noviantari Manyoe
Keyword(s):  
Deep Sea ◽  
Depositional Environment ◽  
Trace Fossils ◽  
Research Area ◽  
Silty Clay ◽  
Marine Sedimentation ◽  
Traction Current ◽  
Layer Stacking ◽  
History Of ◽  
Current Mechanism

The Dolokapa Formation is a sedimentary rock formation formed in a deep-sea depositional environment with a fairly complex level of deformation and tectonic arrangement. Analysis of the sedimentation mechanism is carried out to determine how much tectonic influence on the mechanisms that occur in a depositional environment and the variations in the sedimentation mechanism formed. Research on the sedimentation mechanism needs to be carried out to determine the history of the formation of Gorontalo sedimentary rocks, especially in the Dolokapa Formation which was formed during the Miocene. The purpose of this study is to know the mechanisms of deep-marine sedimentation based on the identification of lithological characteristics, layer stacking patterns, and sedimentary structures. The method used was measuring sections using a range of ropes divided into four measurement paths. After that, a correlation was performed based on the genesis of deep marine formation. Based on the results of processing and analysis of the data, obtained units of lithology that insertion silty-clay, and the sandstone graining insertion of silt. In vertical succession, the layering pattern formed generally thickens upwards which describes the energy of the depositional currents. The sedimentary structure consists of rip up-clast, parallel lamination, graded bedding, convolute, slump, and trace fossils of nereites trace fossils of nereites that characterize the sedimentation of traction currents and turbidite currents in the deep-sea environment. The sedimentation mechanism formed is the traction current mechanism which is a further development of turbidite current and high-low concentration turbidity current mechanism that occurs slowly on a suspension-controlled grain. The stratigraphic relationship of the rock units in the research area is aligned based on the genesis formation that is located in the setting of the deep marine.

scholarly journals Invertebrate trace fossils from the Pennsylvanian Rhode Island Formation of Massachusetts, USA

2017 ◽  
Vol 53 ◽  
pp. 185-206 ◽  
Author(s):  
Patrick R. Getty ◽  
Robert Sproule ◽  
Matthew R. Stimson ◽  
Paul C. Lyons
Keyword(s):  
Rhode Island ◽  
Depositional Environment ◽  
Sedimentary Facies ◽  
Trace Fossils ◽  
Open Pit ◽  
Island Formation ◽  
Sedimentary Environments ◽  
Sedimentary Structures ◽  
Lake Margin

 A large open-pit quarry in Plainville, Massachusetts, has yielded fourteen invertebrate ichnotaxa from the Pennsylvanian Rhode Island Formation of the Narragansett Basin. These traces include Cochlichnus anguineus, Diplichnites cuithensis, Diplichnites gouldi, Diplopodichnus biformis, Gordia carickensis, Helminthoidichites tenuis, Lockeia isp., Mitchellichnus cf. ferrydenensis, Planolites montanus, Siskemia elegans, Stiallia pilosa, Stiaria intermedia, Tonganoxichnus buildexensis and Narragansettichnus fortunatus new ichnogenus and ichnospecies. Specimens were collected from talus and the depositional environment has been inferred from sedimentary structures. The sediment-ology of the slabs on which the traces were preserved indicates that the rocks represent lake-margin and shallowlacustrine sedimentary facies. Distinct ichnofacies occur in the different sedimentary environments. The lake-margin traces belong to the Scoyenia ichnofacies and include traces of apterygote insects, arthropleurid myriapods, bivalved arthropods and vermiform animals in association with tracks of temnospondyl amphibians and diapsid reptiles. The lacustrine traces include arthropod trackways, fish trails and a newly named body imprint possibly produced by an aquatic mayfly larva. These shallow lacustrine traces are attributed to the Mermia ichnofacies.

scholarly journals TRACE FOSSILS FROM THE SHAWANGUNK FORMATION IN THE HUDSON VALLEY INDICATE AN ESTUARINE DEPOSITIONAL ENVIRONMENT

2016 ◽  
Author(s):  
Howard R. Feldman ◽  
◽  
Alex Bartholomew ◽  
Carlton E. Brett ◽  
Matthew B. Vrazo ◽  
...  
Keyword(s):  
Depositional Environment ◽  
Trace Fossils ◽  
Hudson Valley

The trace fossil Yakutatia emersoni from the Cretaceous Kodiak Formation of Alaska

1986 ◽  
Vol 23 (2) ◽  
pp. 262-269 ◽  
Author(s):  
T. McCann ◽  
R. K. Pickerill
Keyword(s):  
Depositional Environment ◽  
Distal Part ◽  
Trace Fossils ◽  
Trace Fossil ◽  
Submarine Fan ◽  
Kodiak Island

The enigmatic trace fossil Yakutatia emersoni has previously only been briefly described from the Cretaceous Kodiak Formation of Kodiak Island, Alaska. Herein we examine the trace fossil in detail, confirm that it is indeed a graphoglyptid, note the associated trace fossils, interpret the depositional environment of the strata in which it occurs as most probably a lobe fringe environment in the distal part of a large submarine fan, and designate a lectotype.

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