Deep and Intense Bioturbation in Continental Environments&lt;subtitle&gt;Evidence from Miocene Fluvial Deposits of Bolivia&lt;/subtitle&gt;

Buatois, Luís A.; Uba, Cornelius E.; Mángano, M. Gabriela; Hulka, Carola; Heubeck, Christoph

doi:10.2110/pec.07.88.0123

Cited by 17 publications

(8 citation statements)

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“…For instance, Goldring and Pollard (1996) and Morrisey and Braddy (2004) assigned unlined meniscate specimens to Beaconites . Despite the efforts of Smith et al (2008), we agree with Buatois et al (2007) in that a comprehensive review of meniscate trace fossils is still necessary.…”

Section: Discussionsupporting

confidence: 71%

Ichnofauna from coastal meandering channel systems (Upper Cretaceous Tremp Formation, South-Central Pyrenees, Spain): delineating the fluvial-tidal transition

et al. 2016

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The Upper Cretaceous “redbeds” of the lower Tremp Formation (South-Central Pyrenees, Spain) contains an ichnofauna consisting of Taenidium barretti, Taenidium bowni, Loloichnus isp., Arenicolites isp., Planolites isp., and Palaeophycus isp. This ichnofauna occurs in deposits formed in tide-influenced meander loops and their associated overbank mudflats. Evaluation of the taphonomic controls on the Tremp ichnofauna shows that (1) two morphotypes of Taenidium barretti are controlled by the substrate consistence, (2) Arenicolites may be enlarged by erosion processes, and (3) Taenidium barretti and Planolites isp. are not the same ichnotaxa showing different types of preservation. The meniscate fill in Taenidium barretti suggests that this structure was produced by deposit feeders. The Tremp ichnofauna is grouped into two trace-fossil assemblages, a depauperate subaquatic monospecific Planolites suite and an assemblage representing the Scoyenia Ichnofacies. Trace-fossil distribution reflects paleoenvironmental changes in the meandering channels along the stratigraphic section with the Planolites suite in the lowermost part of the lower interval and the Scoyenia Ichnofacies in the middle and upper intervals. The lowermost suite may be likely formed seaward of the maximum salinity limit, under extreme brackish-water conditions, whereas the Scoyenia Ichnofacies records a freshwater assemblage that was formed landward of the maximum salinity limit, reflecting deltaic progradation.

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Section: Discussionsupporting

confidence: 71%

Ichnofauna from coastal meandering channel systems (Upper Cretaceous Tremp Formation, South-Central Pyrenees, Spain): delineating the fluvial-tidal transition

et al. 2016

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“…As previously described, one key characteristic of the Lourinhã point‐bar sets is the presence of abundant examples of T. barretti and related traces. Published work on the distribution of this ichnotaxon indicates that it is mainly associated with floodplain/overbank settings, often in association with palaeosols (Buatois & Mángano, , ; Genise et al ., ; Kim et al ., ; Buatois et al ., ; Díez‐Canseco et al ., ). However, in this ‘floodplain’ scenario it is often equivocal as to whether the T. barretti producer colonized subaerially exposed overbank deposits (with variable moisture content), or existed as an aquatic organism exploiting the beds of shallow ponds and lakes.…”

Section: Discussionmentioning

confidence: 98%

Integrated sedimentology and ichnology of Late Jurassic fluvial point‐bars – facies architecture and colonization styles (Lourinhã Formation, Lusitanian Basin, western Portugal)

Gowland¹,

Taylor²,

Martinius

2017

Sedimentology

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Integrated sedimentological and ichnological case studies of ancient meandering river systems have, for the most part, focused on the deposits of the fluvial–tidal transition zone; much less emphasis has been placed on the purely fluvial realm above the landward limit of tidal effects. This problem needs to be addressed so that in future the defining sedimentological and ichnological criteria assigned to ancient fluvial reaches are sufficiently well‐established to enable their separation from the down‐dip fluvial–tidal transition zone. Accordingly, a case study has been carried out on a well‐exposed meander belt deposit from the Late Jurassic Lourinhã Formation of the Lusitanian Basin, western Portugal (Praia Do Valmitão, Ribamar). Analysis indicates that the meander belt here comprised mixed‐load fluvial channels traversing a vegetated floodplain subject to a seasonal winter wet/summer dry palaeoclimate. This setting facilitated the development of both calcic palaeosols and shallow lakes on the adjacent floodplain. Critically, there is no evidence of the effects of tidal modulation on bedding structures, thereby establishing purely fluvial conditions. Heterolithic point‐bar deposits generated in this setting are bioturbated extensively by a trace fossil assemblage dominated by the meniscate trace Taenidium barretti, with Skolithos linearis, Planolites beverleyensis and Cylindricum isp. also recognized. A number of factors suggest that the Taenidium barretti producer in this case was a subaquatic organism living in an active fluvial channel setting (i.e. not colonizing subaerially exposed channel‐margin/floodplain deposits). Accordingly, there are some implications for current ichnofabric/ichnofacies models in the continental realm. Firstly, Taenidium‐dominated ichnofabrics need not necessarily be confined to colonization beneath subaerially exposed surfaces; they might also be produced within submerged substrates. Secondly, there is scope to extend the range of the Scoyenia ichnofacies to include active fluvial channels and not simply those channels that were inactive or abandoned.

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“…All species require a well-drained aerobic substrate. Beyond this, data suggest species and sedimentation rate have more effect than the substrate (Braithwaite et al, 1988;Buatois, Uba, Gabriela, Hulka, & Heubeck, 2007;Gingras, Bann, MacEachern, Waldron, & Pemberton, 2007). Different species have different feeding and nesting behaviors.…”

Section: Habitat and Riskmentioning

confidence: 97%

How do we distinguish termite stone lines from artefact horizons? A challenge for geoarchaeology in tropical Australia

Smith¹,

Ward²,

Moffat³

2021

Preprint

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Can we distinguish stone lines created by termite bioturbation from genuine artefact horizons? This is a challenge for field archaeology and geoarchaeology in northern Australia, where termites are abundant. We review published data to (a) present a model of the evolution of stone lines and (b) develop guidelines for recognizing these bioturbation products in archaeological contexts. In case studies, we examine Madjedbebe and Nauwalabila, two sites in northern Australia. The early occupation levels at these sites are pivotal to ideas about initial human occupation of the Australian landmass but there are claims these are unrecognized stone lines. Our assessment is that neither Madjedbebe nor Nauwalabila contain termite stone lines, although both sites may have complex geomorphic and taphonomic histories.

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Deep and Intense Bioturbation in Continental Environments<subtitle>Evidence from Miocene Fluvial Deposits of Bolivia</subtitle>

Cited by 17 publications

References 0 publications

Ichnofauna from coastal meandering channel systems (Upper Cretaceous Tremp Formation, South-Central Pyrenees, Spain): delineating the fluvial-tidal transition

Ichnofauna from coastal meandering channel systems (Upper Cretaceous Tremp Formation, South-Central Pyrenees, Spain): delineating the fluvial-tidal transition

Integrated sedimentology and ichnology of Late Jurassic fluvial point‐bars – facies architecture and colonization styles (Lourinhã Formation, Lusitanian Basin, western Portugal)

How do we distinguish termite stone lines from artefact horizons? A challenge for geoarchaeology in tropical Australia

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