The Stratigraphical Significance of Trace Fossils

Crimes, T. P.

doi:10.1007/978-3-642-65923-2_7

Cited by 56 publications

(44 citation statements)

References 21 publications

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“…The increase in bed thickness in this area is thought to reflect deposition within a more proximal turbidite fan setting, although the occurrence of the trace fossil Paleodictyon (Fig. 9c) is more indicative of relatively deepwater (Seilacher 1967(Seilacher , 1978Crimes 1975;Bason et al 1978). Thickening and coarsening upward cycles (2 to 10 m thick) are interpreted as individual fan lobes, with thick-bedded calcirudites and calcarenites displaying markedly erosive bases ( Fig.…”

Section: Nayid Formationmentioning

confidence: 95%

“…Ichnofauna, well-preserved in the Jebal Sumeini and Jebal Dhera areas (Figs. 11d and e), indicate deposition on a distal slope (Zoophycos ichnofacies) to basin (Nereites ichnofacies) setting (Seilacher 1967(Seilacher , 1978Crimes 1975;Bason et al 1978). …”

Section: Dhera and Dibba Limestone Formationsmentioning

confidence: 99%

“…The graphoglyptid trace fossil Paleodictyon (see Fig. 9c) is commonly thought to be indicative of a deepmarine environment (Seilacher 1967;Crimes 1975;Bason et al 1978). However, recent work on Tethyan sequences in Iran suggests that Paleodictyon can be found in a wide bathymetric range including shallow-water storm beds (Fürsich et al 2007).…”

Section: Chert Deposition and Palaeo Water Depth Within The Neotethysmentioning

confidence: 99%

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The Jurassic–Cretaceous depositional and tectonic evolution of the southernwestern margin of the Neotethys Ocean, Northern Oman and United Arab Emirates

Phillips

Waters

Ellison

2012

Lithosphere Dynamics and Sedimentary Basins: The Arabian Plate and Analogues

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The concept that the autochthonous, parautochthonous and allochthonous Permian-Cretaceous sequences in the United Arab Emirates (UAE) and Oman record the transition from platform, slope to basin sedimentation within the southern part of Neotethys has been fundamental to the interpretation of the geological history of the region. The results of a major geological mapping programme of the UAE, carried out by the British Geological Survey for the Federal Government of the UAE, coupled with the detailed examination of key sections within northern Oman has led to a re-evaluation of the geological evolution of this region. This detailed study has led to a greater appreciation of the sedimentology and depositional setting of the sediments laid down along the northeastern Arabian continental margin during the Jurassic to Cretaceous, allowing a more refined model of Neotethys Ocean basin evolution to be established. The model charts the progressive breakup of the Arabian continental margin and closure of Neotethys during the mid to late Cretaceous and is divided into three main stages: Stage 1 -Initial rifting and formation of the Neotethys Ocean, followed by a prolonged period of stable, passive margin sedimentation which extended from the Permian to Late Jurassic times; Stage 2 -Uplift and erosion of the shelf margin during the Late Jurassic to Early Cretaceous, coincident with increased carbonate-clastic sedimentation in the outer ramp, distal slope and basinal areas; Stage 3 -Increased instability during the Late Cretaceous leading to the breakup of the platform margin and foreland basin sedimentation accompanying the obduction of the Oman-UAE ophiolite. Data obtained for the upper part of the platform and platform margin to slope successions has revealed that the topography of the "shelf"-slope-basinal margin was more subdued than previously thought, with this more gentle ramp margin morphology persisting until early to midCretaceous times when the platform margin started to become unstable during ophiolite obduction. The thrust-repeated allochthonous sedimentary rocks of the Hamrat Duru Group were deposited on the outer platform margin/lower slope rise to basinal plain of this basin margin and includes the dismembered remains of two turbidite fan systems which fed carbonate-rich detritus into deeper parts of the ocean. A re-evaluation of the chert-rich sequences, previously equated with deposition on the abyssal plain of Neotethys, has led to the conclusion that they may record sedimentation at a much shallower level within a starved ocean basin, possibly in a mid-ramp (above storm wave base) to outer ramp setting. A marked change in basin dynamics occurred during the mid-Cretaceous leading to the development of a shallow ramp basin margin in Oman with terrestrial to shallow marine sedimentary rocks interdigitating with red siliceous mudstones. By contrast, the contemporaneous succession in the Dibba Zone of the UAE indicates considerable instability on a steep shelf break. This instability is recorded by t...

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Section: Nayid Formationmentioning

confidence: 95%

Section: Dhera and Dibba Limestone Formationsmentioning

confidence: 99%

Section: Chert Deposition and Palaeo Water Depth Within The Neotethysmentioning

confidence: 99%

See 1 more Smart Citation

The Jurassic–Cretaceous depositional and tectonic evolution of the southernwestern margin of the Neotethys Ocean, Northern Oman and United Arab Emirates

Phillips

Waters

Ellison

2012

Lithosphere Dynamics and Sedimentary Basins: The Arabian Plate and Analogues

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“…Undoubtedly the cubichnia of trilobites (less frequent other arthropods) are concerned. Individual ichnospecies are described in details, e.g., by Osgood (1970), Seilacher (1970), Crimes (1975), Crimes & Marcos (1976), Baldwin (1977), Crimes et al (1977). In the case of the Andoma traces, a common tracemaker with the traces described as Cruziana isp.…”

Section: Ichnogenus Rusophycus Hall 1852mentioning

confidence: 99%

A rich ichnofossil assemblage from the Frasnian (Upper Devonian) deposits at Andoma Hill, Onega Lake, Russia

Mikuláš¹,

Mešíıs²,

Ivanov³

et al. 2013

Bull. Geosci.

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Trace fossils and ichnofabrics were recognized in the Middle to Upper Devonian deposits of the East European Platform at the Onega Lake (NW Russia), developed as the Old Red Sandstone facies. The studied sequence is aged from the upper Givetian to the Middle Frasnian. The most diverse ichnoassemblage was ascertained in the earliest Frasnian (lower to middle part of the Andoma Formation), comprising the ichnogenera ?Arenituba, Cochlichnus, Cruziana, Diplocraterion, Lockeia, Palaeophycus, Planolites, Rusophycus, Skolithos, Teichichnus, and Undichna. Combination of ichnologic and sedimentary data points to the assumption that these deposits probably originated in wave- and tide-influenced environments, possibly in a brackish-water estuary. Towards the middle Frasnian, Skolithos-like trace fossil dominate; the ichnoassemblage can be attributed to the tidally influenced channels and bars

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“…The distortion of these worm tubes, which in the undeformed state are subperpendicular to the bedding plane [44,45], is a useful shear criteria in regions deformed by transpression [41]. In the studied domain, although the geometrical relation between the Skolithos and the bedding plane are markedly different from limb to limb ( Fig.…”

Section: Transpressive Variscan Folds In the Northernmentioning

confidence: 99%

Heterogeneous strain behaviour in competent layers during folding in transpressive regimes

Dias

Ribeiro

2008

Geodinamica Acta

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The understanding of folding processes in transpression is crucial in structural geology. However, the study of folding in multilayers where adjacent strata exhibit high competence contrast is impossible if the observations are only restricted to geometrical features. Nevertheless, using detailed three dimensional finite strain analyses it is possible to constrain the solutions. Strain data from the deformed northern Portugal Ordovician quartzites show that folding mechanisms in transpression are highly variable. For the more deformed materials found, not only in the short limbs, but also in the thinner layers of the long limbs, the strain ellipsoids orientations can be explained by a combination of flexural shear (related to the folding process) and sinistral wrench component parallel to the bedding plane (a pervasive regime in the southern branch of the Ibero-Armorican Arc). In the thicker layers of the long limbs, orthogonal flexure seems to be the dominant mechanism. Concerning the strain ellipsoid shape, the constrictional forms predominate mainly in the long limbs. Strain partitioning in transpressive regimes is important at the mesoscopic fold scale, especially in asymmetric folds. In the more deformed short limb, the data indicate that transpression tends to be always an active mechanism, while in the long limb the regional wrench component it's often less important.

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The Stratigraphical Significance of Trace Fossils

Cited by 56 publications

References 21 publications

The Jurassic–Cretaceous depositional and tectonic evolution of the southernwestern margin of the Neotethys Ocean, Northern Oman and United Arab Emirates

The Jurassic–Cretaceous depositional and tectonic evolution of the southernwestern margin of the Neotethys Ocean, Northern Oman and United Arab Emirates

A rich ichnofossil assemblage from the Frasnian (Upper Devonian) deposits at Andoma Hill, Onega Lake, Russia

Heterogeneous strain behaviour in competent layers during folding in transpressive regimes

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