The ichnology of the fluvial–tidal transition

Díez-Canseco, Davinia; Buatois, Luís A.; Mángano, M. Gabriela; Rodríguez, W.; Solorzano, E.

doi:10.1016/b978-0-444-63529-7.00009-2

Cited by 12 publications

(9 citation statements)

References 74 publications

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“…The record of Scolicia in stressed substrates of distal, brackish, tidally-dominated, or -influenced channels is scarce (e.g. 52 ). In addition, the higher ichnodiversity (marine elements) suggests increased marine conditions towards the top (Fig.…”

Section: Discussionmentioning

confidence: 99%

Early Aptian marine incursions in the interior of northeastern Brazil following the Gondwana breakup

Fauth

Kern

Villegas‐Martín

et al. 2023

Sci Rep

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This study reports a set of primeval marine incursions identified in two drill cores, 1PS-06-CE, and 1PS-10-CE, which recovered the Barbalha Formation, Araripe Basin, Brazil. Based on a multi-proxy approach involving stratigraphy, microbiofacies, ichnofossils, and microfossils, three short-lived marine incursions were identified, designated Araripe Marine Incursions (AMI) 1–3. AMI-1 and AMI-2, which occur within the shales of the Batateira Beds (lower part of the Barbalha Formation), were identified by the occurrence of benthonic foraminifera, calcareous nannofossils, dinocysts, and a mass mortality event of non-marine ostracods. AMI-3 was recognized in the upper part of the Barbalha Formation, based on the occurrence of ichnofossils and planktonic foraminifera. The observation of the planktonic foraminifera genus Leupoldina for the first time in the basin indicates early Aptian/early late Aptian age for these deposits, and the first opportunity of correlation with global foraminifera biozonation. Our findings have implications for the breakup of the Gondwana Supercontinent, as these incursions represent the earliest marine-derived flooding events in the inland basins of northeastern Brazil.

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Section: Discussionmentioning

confidence: 99%

Early Aptian marine incursions in the interior of northeastern Brazil following the Gondwana breakup

Fauth

Kern

Villegas‐Martín

et al. 2023

Sci Rep

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“…suites, indicating emplacement in a softground. This ichnofabric may have been formed under brackish-water conditions (Díez-Canseco et al 2015, 2016). This interpretation was based on the ichnofacies analysis carried out in the regressive stratigraphic section of the lower Tremp Formation where a depauperate trace-fossil assemblage present at the base of the succession reflects colonization in the brackish-water zone of the fluvial-tidal transition.…”

Section: Ichnofabric Analysismentioning

confidence: 99%

“…Firstly, trace-fossil distribution in meander-loop systems depends on the interplay of environmental factors, such as sedimentation rate, pauses in sedimentation, and discharge variations (e.g., Gowland et al 2018). Because meander-loop systems dominated by high-sinuosity channels occur across a wide variety of depositional settings from fluvial to deep-sea fan environments and are particularly common along low-gradient slopes, especially in marginal-marine settings (e.g., Smith 1987; Miall 2010; Deptuck and Sylvester 2018), other factors such as tides, fair-weather waves, storm waves, and salinity fluctuations may also control the distribution of the ichnofauna (e.g., Díez-Canseco et al 2015). Meander-loop deposits typically comprise inclined to horizontal lateral accretion units, which are dominated by point bars that form successively along the inner channel bank, while the outer bank is eroded (e.g., Moody-Stuart 1966; Thomas et al 1987; Miall 2010).…”

Section: Introductionmentioning

confidence: 99%

Unlocking the Architecture of the Colonization Window: Ichnofabrics From Upper Cretaceous Tide-Influenced Meander-Loop Deposits

Díez-Canseco

Buatois

Mángano

et al. 2023

Palaios

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Studies dealing with the colonization window typically emphasize two major features: duration (short term vs. long term) and frequency of colonization (episodic vs. continuous). However, our understanding of tide-influenced meander loops requires consideration of an additional feature, the architecture of the colonization window, which comprises not only the spatial dimension and geometry of the colonization surface, but also its evolution through time. Tide-influenced meander-loop systems show a heterogeneous trace-fossil distribution that reflects the variety of processes operating along the point-bar and overbank colonization surfaces. Ichnofabric analysis of tide-influenced meander-loop deposits from the Upper Cretaceous Tremp Formation (Pyrenees, Spain) provides valuable insights into the sedimentary and ichnological dynamics of these marginal-marine systems and allows the importance of stratal geometry controlling the colonization window to be evaluated. Six ichnofabrics are identified in point bars and associated overbank deposits. These ichnofabrics differ in bioturbation index (e.g., higher in the upper part than the lower-middle parts of point bars), preservation of primary sedimentary fabric (typically preserved in the lower-middle parts of point bars), inferred behavior and trophic types (e.g., dominance of dwelling or feeding structures in the lower-middle and upper parts of point bars, respectively), and other features such as depth of penetration, ichnotaxonomic composition, presence or absence of root trace fossils and/or mottling, or number of superimposed suites. The key environmental factor controlling the nature and distribution of ichnofabrics is the morphology of the point-bar lateral-accretion surfaces and their evolution through time. The architecture of the colonization window is here linked to the helicoidal flow and discharge changes in meandering channels, and the successive development of lateral accretion units with time.

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“…The impoverished marine ichnological suites of F2 are characterized by low trace‐fossil diversities, diminutive expressions and simple structures, which are typical of brackish‐water conditions (e.g. Pemberton et al ., 1982; Frey & Howard, 1986; Beynon et al ., 1988; MacEachern & Pemberton, 1994; Gingras et al ., 1999, 2011, 2016; Buatois et al ., 2005; MacEachern & Gingras, 2007; Diez‐Canseco et al ., 2015, 2016). Reduced trace‐fossil diversities dominated by simple structures reflect opportunistic feeding strategies, which aid in rapid adaptation to unstable environmental conditions and to rapid colonization of unexploited substrates (Pianka, 1972; Wolff, 1973; Grassle & Grassle, 1974; Gingras et al ., 1999, 2011; MacEachern & Gingras, 2007).…”

Section: Facies and Facies Distributionsmentioning

confidence: 99%

“…Resulting physico‐chemical stresses on the brackish‐water infaunal community include elevated sedimentation rates, variations in substrate consistency, increased water turbidity, diluted marine nutrient supply, regular subaerial exposure, reduced and/or fluctuating salinity, and temperature variations (e.g. Doerjes & Howard, 1975; Reineck & Singh, 1980; Frey & Howard, 1986; Beynon et al ., 1988; Ysebaert et al ., 1998; Buatois et al ., 2005; MacEachern & Bann, 2008; Gingras et al ., 2011; Diez‐Canseco et al ., 2015, 2016; La Croix et al ., 2015). To explore how regional and local processes result in vertical and lateral sedimentological and ichnological variations in fluvio‐tidal translating point bars, detailed descriptions at the lamina, laminaset, bed and bedset scales are required.…”

Section: Introductionmentioning

confidence: 99%

Sedimentological and ichnological variations in fluvio‐tidal translating point bars, McMurray Formation, Alberta, Canada

Fietz,

MacEachern,

Gingras

et al. 2023

Sedimentology

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Sedimentological and ichnological descriptions of fluvio‐tidal translating point bars are rare, and complex physico‐chemical processes make highly detailed but concise facies descriptions challenging. Herein, mesofacies are defined to describe and interpret three ancient translating point bars from the Lower Cretaceous McMurray Formation, Alberta, Canada. Twenty‐three mesofacies are defined, based on their recurring sedimentological and ichnological characteristics. These mesofacies form the building blocks of beds and bedsets that make up three depositional facies. Facies 1 reflects sand dune migration at the channel base, which grades into inclined heterolithic stratification of Facies 2 and 3. Facies 2 occurs in the centre and seaward portions of the translating point bars and records tide‐dominated deposition of sand and muddy sand during periods of reduced river discharge. Ichnological suites and bioturbation intensities in these beds reflect persistent but variable brackish‐water conditions, fluctuating deposition rates and the deposition of mud. Mud beds are derived from flows with high suspended‐sediment concentrations. Tidally derived mud beds are typically bioturbated with trace fossil suites indicative of slow deposition rates and brackish‐water conditions. Mud deposited during elevated river discharge is burrowed after the dewatering of the bed. Facies 3 occurs at the landward apex of the translating point bar and is marked by sand‐rich and mud‐rich dune deposits with abundant soft‐sediment deformation, indicative of elevated flow velocities and deposition rates. Bioturbation is rare and sporadically distributed owing to unstable substrates. The distribution of the facies reflect the hydrodynamic variations that occurred vertically and laterally across the bar in response to temporal variations in fluvial and tidal flow interaction, as recorded by their mesofacies. The detailed facies analysis strongly suggests that deposition of the three McMurray Formation translating point bars occurred in proximity to the turbidity maximum zone of a fluvio‐tidal channel system.

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The ichnology of the fluvial–tidal transition

Cited by 12 publications

References 74 publications

Early Aptian marine incursions in the interior of northeastern Brazil following the Gondwana breakup

Early Aptian marine incursions in the interior of northeastern Brazil following the Gondwana breakup

Unlocking the Architecture of the Colonization Window: Ichnofabrics From Upper Cretaceous Tide-Influenced Meander-Loop Deposits

Sedimentological and ichnological variations in fluvio‐tidal translating point bars, McMurray Formation, Alberta, Canada

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