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

Díez-Canseco, Davinia; Buatois, Luís A.; Mángano, M. Gabriela; Díaz-Molina, M.; Benito, M. Isabel

doi:10.1017/jpa.2016.12

Cited by 27 publications

(24 citation statements)

References 84 publications

(140 reference statements)

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“…The widespread occurrence of non-reworked planktonic foraminiferal associations and autogenic glauconite grains within the whole Lower Red Unit, document landward-directed flows, which were interpreted to be tidal in origin by D ıez-Canseco et al (2014). The ichnofauna of the channelized bodies documents sedimentation across the maximum salinity zone, with an abundance of Arenicolites and the establishment of a freshwater assemblage in the central and uppermost part of the unit, respectively (D ıez-Canseco et al, 2016).…”

Section: The Lower Red Unit In the Study Areamentioning

confidence: 94%

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Reading tidal processes where their signature is cryptic: The Maastrichtian meandering channel deposits of the Tremp Formation (Southern Pyrenees, Spain)

et al. 2021

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Tidal currents can propagate tens of kilometres landward from the shoreline, forming dense networks of meandering channels, which drain vegetated areas and range in width from tens to hundreds of metres. Sedimentary products of these inland tidal channels are poorly documented in the stratigraphic record, as most studies on tidal processes occurring in inland areas are focused on fluvio-tidal interaction. The present study contributes to filling this gap, investigating Late Maastrichtian meandering-channel deposits of the Tremp-Graus Basin (Southern Pyrenees, Spain). These deposits accumulated in a growth syncline, which allowed the development of a 20 to 30 km wide, 80 to 100 km long, tidal embayment. Sporadic occurrence of poorly-developed rhythmites and bidirectional currents confirms the occurrence of tidal processes, whereas their local dominance is inferred from several pieces of evidence, including: (i) disproportion between depth of the larger channels and related catchment area; (ii) landward-accretion of pointbar bodies; (iii) landward fining of point-bar bodies, and (iv) reconstruction of palaeo-flow patterns at the meander bend scale. This work shows that three-dimensional architectural modelling and reconstruction of bar planform transformation styles can provide a critical contribution to the understanding of tidal control on sedimentation in inland areas.

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Section: The Lower Red Unit In the Study Areamentioning

confidence: 94%

“…(2014). The ichnofauna of the channelized bodies documents sedimentation across the maximum salinity zone, with an abundance of Arenicolites and the establishment of a freshwater assemblage in the central and uppermost part of the unit, respectively (Díez‐Canseco et al ., 2016).…”

Section: Geological Settingmentioning

confidence: 99%

Reading tidal processes where their signature is cryptic: The Maastrichtian meandering channel deposits of the Tremp Formation (Southern Pyrenees, Spain)

et al. 2021

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“…Following deposition, the upper parts of splay lobes were reworked by waves and colonized by burrowers, as evidenced by the occurrence of wave ripple strata and burrows at the top of sandstone. Bioturbation observed as paired circular openings at the top of sandstone may correspond to U‐shaped or Y‐shaped burrows, which are common in marginal‐marine environments (Buatois & Mangano, 2011), as similarly occurs in the deposits of the fluvial–tidal transition in the Upper Cretaceous Tremp Formation, in the Pyrenees (Díez‐Canseco et al ., 2014, 2016), for example. Splay lobes underwent subaerial exposure, as indicated by the occurrence of edaphic features, as similarly reported in other ancient deposits (Yeste et al ., 2020), as well as by the local occurrence of dinosaur tracks at the top of sandstone.…”

Section: Resultsmentioning

confidence: 99%

Where humid and arid meet: Sedimentology of coastal siliciclastic successions deposited in apparently contrasting climates

et al. 2022

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Deciphering the palaeoenvironmental and palaeoclimatic setting of ancient successions that include deposits typical of different climates can be challenging. This is the case in the Late Jurassic succession cropping out in eastern Spain (South-Iberian and western Maestrazgo basins), where deposits characteristic of both arid to semiarid and humid to subhumid settings have been identified through a detailed analysis of eight stratigraphic sections. These sections comprise shallow marine carbonates changing upward and laterally to a predominantly siliciclastic coastal and alluvial succession, including abundant dinosaur remains. Deposition of coastal and alluvial sediments occurred in flood plains, ephemeral and perennial fluvial channels, aeolian dunes, deltas, distributary mouth-bars and associated distributary channels, and shallow water bodies influenced by both fresh and marine waters. Some of these deposits, notably those of aeolian and ephemeral fluvial origin, are characteristic of arid to semiarid climates. However, there are also abundant deposits that can be demonstrably shown to have a coeval origin, which are indicative of permanent water courses: (i) sediments of seasonal discharge fluvial channels with perennial to semi-perennial flow, displaying subcritical and supercritical flow sedimentary structures; (ii) deltaic sediments deposited in permanent freshwater bodies; and (iii) abundant plant and dinosaur remains, especially of herbivorous dinosaurs, which required the presence of permanent water sources and abundant vegetation. These apparently contrasting sedimentary features indicate that deposition occurred under a seasonal climate controlled by monsoonal-type precipitation. These deposits are analogous to those observed nowadays in the Lenc ß ois Maranhenses National Park (north-east Brazil), where a subhumid tropical climate with a seasonal precipitation pattern prevails. Thus, this study shows that only through careful facies analysis and interpretation of depositional processes that can be shown to be occurring concurrently in 975

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“…The recognition of tidally generated sedimentary structures and marine fossils suggests a more complex marginal-marine setting. Deposition in the fluvial-tidal transition of a tide-dominated delta has been proposed (Díez-Canseco et al 2014, 2016). Towards the west, the Lower Red Unit is replaced laterally by the marginal-marine deposits of the Aren Formation and the Grey Unit of the Tremp Formation (Nagtegaal et al 1983; Díaz-Molina et al 2007; Riera et al 2009) (Fig.…”

Section: Geologic Settingmentioning

confidence: 99%

“…B ) Summary of sedimentological characteristics, including the results of this study. Modified from Díez-Canseco et al (2014, 2016). Abbreviations: Ar/Tae = Arenicolites / Taenidium ichnofabric; Tae1 = Taenidium ichnofabric 1; Tae2 = Taenidium ichnofabric 2; Lo = Loloichnus ichnofabric; Lo/Tae = Loloichnus-Taenidium ichnofabric.…”

Section: Geologic Settingmentioning

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

Cited by 27 publications

References 84 publications

Reading tidal processes where their signature is cryptic: The Maastrichtian meandering channel deposits of the Tremp Formation (Southern Pyrenees, Spain)

Reading tidal processes where their signature is cryptic: The Maastrichtian meandering channel deposits of the Tremp Formation (Southern Pyrenees, Spain)

Where humid and arid meet: Sedimentology of coastal siliciclastic successions deposited in apparently contrasting climates

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

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