Paleohydrological significance of trace fossil distribution in Oligocene fluvial-fan-to-lacustrine systems of the Ebro Basin, Spain

Gibert, Jordi M. de; Sáez, Alberto

doi:10.1016/j.palaeo.2008.10.030

Cited by 37 publications

(13 citation statements)

References 42 publications

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“…Moreover, Scoyenia ornamentation is composed of raised scratches on burrow external walls, approximately longitudinal to burrows; in this burrow termination, scratches are internal to the burrow walls, and the orientation of scratch sets varies (see Figs 3D, E). Additionally, Scoyenia burrows are most commonly bedding-parallel (Gierlowski-Kordesch 1985;de Gibert and Saez 2009;Hubert and Dutcher 2010). Because of these differences, we prefer the interpretations of Bromley and Asgaard (1979), Schlirf and Uchman (2005), and Schlirf et al (2001), and ally this trace with Skolithos.…”

Section: Incertae Sedismentioning

confidence: 99%

Insights into an Early Jurassic dinosaur habitat: ichnofacies and enigmatic structures from the Portland Formation, Hoover Quarry, Massachusetts, U.S.A.

Collette

Getty²,

Hagadorn

2011

atgeol

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Jurassic sandstones of the Hartford Basin are well known for their dinosaur trackways, but few studies have characterized their invertebrate ichnofaunas. A notable Portland Formation exposure in this area is the Hoover Quarry in East Longmeadow, Massachusetts, where vertebrate skeletal material (the type specimen of the crocodilian Stegomosuchus longipes) occurs in association with a diverse ichnofauna. Hoover Quarry ichnogenera include Eubrontes cf. gracilis, Planolites beverleyensis, Planolites montanus, probable Scoyenia burrows, and Skolithos isp. Also preserved at the site is Palaeophycus tortuosus, a sinusoidal burrow that had been previously synonymized with Palaeophycus tubularis. A probable Skolithos burrow termination with an unusual pattern of scratches also occurs, along with several problematic stellate structures. At this site, primary sedimentary structures on trace bearing surfaces are consistent with deposition in a shallow aquatic environment that was periodically emergent. Viewed in the context of nearby sections of the Portland Formation, Hoover Quarry exposures could have been deposited in fluvial, ephemeral lacustrine, or playa environments. Traces in the Hoover Quarry indicate Scoyenia-Skolithos-composite ichnofacies, elements of which are commonly produced in continental firmground environments. RÉSUMÉLes grès du Jurassique dans le bassin de Hartford sont reconnus pour la présence d'empreintes de dinosaures. Mais peu d'études ont permis de caractériser l'ichnofaune invertébrée qu'on peut également y observer. Un affleurement notable de la Formation Portland dans la région est présent dans la carrière Hoover, à East Longmeadow, au Massachusetts, où des matériaux de squelettes de vertébrés (le spécimen type du crocodilien Stegomosuchus longipes) et une ichnofaune diversifiée sont présents. L'ichnofaune de la carrière Hoover comprend les espèces comme Eubrontes cf. gracilis, Planolites beverleyensis, Planolites montanus, vraisemblablement des terriers de Scoyenia, et Skolithos. Il y a également sur le site l'espèce Palaeophycus tortuosus, un terrier sinusoïdal qui a déjà été nommé Palaeophycus tubularis. L'extrémité d'un terrier de l'espèce probable Skolithos accompagnée d'une série inusitée de stries ou d'éraflures est en outre présente, tout comme plusieurs structures étoilées dont l'origine demeure mystérieuse. Sur le site, des structures primaires sur des surfaces marquées de traces correspondraient à une sédimentation dans un milieu aquatique peu profond qui a émergé à intervalles périodiques. Considéré dans le contexte des sections de la Formation Portland, situées à proximité, le dépôt des affleurements de la carrière Hoover pourrait être survenu dans un milieu fluvial, lacustre éphémère ou en présence d'un lac temporaire. Les traces relevées dans la carrière Hoover indiquent la présence d'un ichnofaciès composite de type Scoyenia-Skolithos, dont les éléments sont couramment produits dans un milieu de sol continental à cohésion moyenne.[Traduit par la redaction]

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Section: Incertae Sedismentioning

confidence: 99%

Insights into an Early Jurassic dinosaur habitat: ichnofacies and enigmatic structures from the Portland Formation, Hoover Quarry, Massachusetts, U.S.A.

Collette

Getty²,

Hagadorn

2011

atgeol

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“…The average proportion between the burrow lengths is 1:2 and is linked to the depth of ground water level: while the freatic level is established at a depth of 30 cm at the lagoon edges that comprise the backbarrier deposits, in the backshore areas it occurs at a depth of around 60 cm. Water table fluctuations have been reported as an important feature that controls the distribution of biogenic sedimentary structures in subaerial continental settings, with the position of the water table being the major factor governing the archetypical continental ichnofacies (Buatois & Mángano, 2004Hasiotis, 2007;Netto, 2007;Gibert & Sáez, 2009). Therefore, the differences between burrow lengths of Psilonichnus specimens in the same ichnoassociation may be used to interpret different depths of the water table level also in marginal marine settings where the Psilonichnus Ichnofacies occurs, helping to demarcate autocyclic stratigraphic surfaces.…”

Section: Stratigraphic Implicationsmentioning

confidence: 99%

Neoichnology of the seaward side of Peixe Lagoon in Mostardas, southernmost Brazil: The Psilonichnus ichnocoenosis revisited

Netto¹,

Grangeiro²

2009

Rev. bras. paleont.

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This paper characterizes the modern Psilonichnus ichnocoenosis present in the seaward side of Peixe Lagoon (southernmost Brazil) and discusses its preservation potential in the fossil record and its (paleo)environmental and stratigraphic significances. This ichnofauna occurs in exposed softgrounds and stiffgrounds of the backshore and backbarrier environments associated with the channel mouth area of the lagoon. The burrow assemblage is composed of Y-and J-shaped dwelling burrows and trackways of grapsid crabs (Chasmagnatus granulata), fiddler crabs (Uca uruguayensis), and ocypodid crabs (Ocypode quadrata), tracks and trackways of scarab beetles, birds, and small lizards, horizontal, randomly branched, shallow feeding burrows of mole crickets, dwelling burrows of small rodents and ant nests. As a natural park, most of the natural environmental conditions that support the establishment of such an ichnocoenosis are preserved in the study area, favoring its use as a modern analogue to the ancient Psilonichnus Ichnofacies. Thus, original concepts developed after the first record of the Psilonichnus ichnocoenosis in modern environments, which supported the construction of the Psilonichnus Ichnofacies paradigm, are revisited herein and some premises are reinforced. Possible stratigraphic scenarios are also estimated, allowing the inference that the best preservation of the Psilonichnus Ichnofacies occurs during the establishment of transgressive system tracts.RESUMO -Este trabalho caracteriza a icnonocenose moderna de Psilonichnus presente na porção marinha da lagoa do Peixe (extremo sul do Brasil) e discute seu potencial de preservação no registro fóssil e seu significado (paleo)ambiental e estratigráfico. A icnofauna analisada ocorre em substratos moles e em substratos compactados plásticos de ambientes de antepraia e atrás da barreira eólica associados à área de desembocadura do canal principal que alimenta a lagoa. A assembléia é composta por trilhas e escavações de moradia em forma de Y e J de caranguejos (Chasmagnatus granulata, Uca uruguayensis e Ocypode quadrata), pegadas e trilhas de aves, pequenos lagartos, besouros escarabeídeos, escavações horizontais, irregularmente ramificadas, rasas, feitas por grilotalpídeos em busca de alimento, galerias de pequenos roedores e ninhos de formigas. Por ser um parque natural, as condições ambientais vigentes na lagoa do Peixe são muito próximas das de ambientes intocados, o que favorece ao estudo da icnocenose de Psilonichnus ali presente como análogo moderno da Icnofácies Psilonichnus. Assim, os conceitos originais, formulados a partir do primeiro registro da icnocenose de Psilonichnus em ambientes modernos -e que serviram de base para a construção do paradigma que rege a Icnofácies Psilonichnus -, são aqui revisitados e algumas premissas, reforçadas. A análise de possíveis cenários estratigráficos permite inferir que a melhor preservação da Icnofácies Psilonichnus se dê durante o estabelecimento de tratos de sistemas transgressivos. Palavras-chave: icnocenose de Psiloni...

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“…Some studies of ancient fans do link fluvial fans to discharge variability, using either sedimentary, paleobotanical or trace fossil data (e.g. Allen, Cabrera, Colombo, & Matter, ; Nichols & Hirst, ; Hinds et al, ; Nichols & Fisher, ; Fisher, Krapf, Lang, Nichols, & Payenberg, ; de Gibert & Sáez, ; Bashforth, Cleal, Gibling, Falcon‐Lang, & Miller, ), but others dispute any climate controls (Hartley et al, ). Independent of the specific controls, the fluvial fans undeniably present an opportunity to study fundamental controls on deposition, such as the role of updip and downdip processes, or the role of accommodation for accumulation vs. preservation.…”

Section: Introductionmentioning

confidence: 99%

Stratigraphic complexity in fluvial fans: Lower Eocene Green River Formation, Uinta Basin, USA

Wang

Plink‐Björklund

2019

Basin Research

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In this study, measured outcrop sections and geolocated photomosaics are integrated with areal mapping of channel dimensions, degree of amalgamation, calculations of channel‐to‐floodplain ratios and sedimentary facies variability to study and quantify the channel and floodplain deposits in the Sunnyside Delta Interval of the Lower Eocene Green River Formation in the Uinta Basin, Utah. Vertically, sand content and bed thickness increases, due to an increase in the channel‐to‐floodplain ratio, channel size and the degree of channel amalgamation. Laterally, the channel‐to‐floodplain ratio, channel size, the degree of channel amalgamation and the sand content in channel facies decreases in the paleo‐downstream direction. Such vertical and lateral transitions identify the Sunnyside Delta Interval as a fluvial fan (or distributive fluvial system). However, the vertical and lateral transitions occur at multiple spatial scales, demonstrating considerable stratigraphic complexity as compared to the existing facies and architectural models suggested for fluvial megafans and distributive fluvial systems. The smallest‐scale transitions are identified as avulsion‐related packages that form the building blocks of the stratigraphy, whereas the intermediate‐ and largest‐scale transitions are suggested to be related to lobe and whole fan progradation respectively. This documented complexity indicates the significance of self‐organization in building fluvial fan stratigraphy, and demonstrates that changes in the degree of channel amalgamation or in channel‐to‐floodplain ratio are not linked to accommodation changes. On facies scale, an abundance of Froude supercritical‐flow and high‐deposition‐rate facies, in‐channel mud deposits, and in‐channel bioturbation and desiccation indicate deposition in rivers with highly variable discharge. Such discharge conditions suggest seasonally and inter‐annually variable precipitation conditions in the US Western Interior in the Early Eocene.

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Paleohydrological significance of trace fossil distribution in Oligocene fluvial-fan-to-lacustrine systems of the Ebro Basin, Spain

Cited by 37 publications

References 42 publications

Insights into an Early Jurassic dinosaur habitat: ichnofacies and enigmatic structures from the Portland Formation, Hoover Quarry, Massachusetts, U.S.A.

Insights into an Early Jurassic dinosaur habitat: ichnofacies and enigmatic structures from the Portland Formation, Hoover Quarry, Massachusetts, U.S.A.

Neoichnology of the seaward side of Peixe Lagoon in Mostardas, southernmost Brazil: The Psilonichnus ichnocoenosis revisited

Stratigraphic complexity in fluvial fans: Lower Eocene Green River Formation, Uinta Basin, USA

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