Bioturbation and Trace Fossils in Deep Sea Sediments of the Walvis Ridge, Southeastern Atlantic, Leg 74

Fütterer, Dieter K

doi:10.2973/dsdp.proc.74.112.1984

Cited by 7 publications

(3 citation statements)

References 8 publications

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“…Such a verification was carried out here using Deep Sea Drilling Project and Ocean Drilling Project records. Based on these records the depth of the Madagascar Ridge (Schlich, 1974), Mascarene Ridge (Backman et al, 1988;Fisher et al, 1974;, Shatsky Rise, Ontong Java Plateau (Barrera et al, 1993), Kerguelen Plateau (Mackensen and Berggren, 1992), Walvis Ridge (Zachos et al, 2005;Fuetterer, 1984) and the Rio Grande Rise (Perch-Nielsen et al, 1977) were adjusted.…”

Section: Bathymetric Revisionsmentioning

confidence: 99%

A suite of early Eocene (~ 55 Ma) climate model boundary conditions

et al. 2014

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Abstract. We describe a set of early Eocene (~ 55 Ma) climate model boundary conditions constructed in a self-consistent reference frame and incorporating recent data and methodologies. Given the growing need for uniform experimental design within the Eocene climate modelling community and the challenges faced in simulating the prominent features of Eocene climate, we make publicly available our data sets of Eocene topography, bathymetry, tidal dissipation, vegetation, aerosol distributions and river runoff. Major improvements in our boundary conditions over previous efforts include the implementation of the ANTscape palaeotopography of Antarctica, more accurate representations of the Drake Passage and Tasman Gateway, as well as an approximation of sub grid cell topographic variability. Our boundary conditions also include for the first time modelled estimates of Eocene aerosol distributions and tidal dissipation, both consistent with our palaeotopography and palaeobathymetry. The resolution of our data sets is unprecedented and will facilitate high resolution climate simulations. In light of the inherent uncertainties involved in reconstructing global boundary conditions for past time periods these data sets should be considered as one interpretation of the available data and users are encouraged to modify them according to their needs and interpretations. This paper marks the beginning of a process for reconstructing a set of accurate, open-access Eocene boundary conditions for use in climate models.

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Section: Bathymetric Revisionsmentioning

confidence: 99%

A suite of early Eocene (~ 55 Ma) climate model boundary conditions

et al. 2014

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“…Trace fossils constitute a major portion of the observable structures within deep-sea cores. Several descriptive accounts of the variety of trace fossils present in DSDP cores (e.g., Ekdale, 1977Ekdale, , 1980Fütterer, 1984) have been written, yet relatively few ODP/DSDP authors have attempted to document systematically their occurrence during routine core description (e.g., Wetzel, 1987;Wetzel and Wijayananda, 1990;Droser and Bottjer, 1991). The 5500 m of sediment recovered from the eastern equatorial Pacific during Leg 138 provided an ideal opportunity to document the spatial and temporal variations in trace-fossil diversity and abundance in a wide range of deep-sea pelagic sediment facies from ooze to clay.…”

Section: Introductionmentioning

confidence: 99%

Variation of Trace Fossils and Ichnofacies in Neogene and Quaternary Pelagic Sediments from the Eastern Equatorial Pacific Ocean (Leg 138)

Kemp¹

1995

Proceedings of the Ocean Drilling Program, 138 Scientific Results

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Analysis of the incidence and relative abundance of trace fossils in sediments from the eastern equatorial Pacific Ocean reveals distinct patterns of occurrence. A major control on variation in ichnofacies appears to be the organic carbon content of the sediments. Ichnofacies dominated by Zoophycos are characteristic of sites having diatomaceous sediments that are relatively rich in organic matter (0.5%-1.5%). Isolated Zoophycos burrows occur in darker, diatom-rich interbeds within nannofossil ooze sections. In thick, variably diatomaceous nannofossil oozes having lower C org contents (0.1%-0.3%), but with pyrite or monosulfide, Chondrites is more evident and Zoophycos rarer. Sections characterized by the lowest sedimentation rates and C org concentrations between 0% and 0.1 %, commonly include Skolithos, which is rare or absent in other ichnofacies. A series of large, subvertical, and open burrows, not previously described in deep-sea cores, is suggested to be the product of echiuran worms.

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“…Most ichnological work on cores has concentrated on discrete trace fossils in deep-sea cores (e.g., Ekdale, 1977Ekdale, ,1978Ekdale, ,1980Fütterer, 1984;Wetzel, 1987). Few studies have been conducted on trace fossils in cores of shallow-water or even shelf sediments (but see Beynon et al, 1988, andWightman et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

Trace Fossils and Ichnofabric in Triassic Sediments from Cores Recovered on Leg 122

Droser¹,

O’Connell²

1992

Proceedings of the Ocean Drilling Program

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Combined ichnofabric and sedimentological facies analyses were undertaken in Triassic cores from Ocean Drilling Program Sites 759, 760, 761, and 764 on the Wombat Plateau, northwest Australia, to determine the depositional environment and ichnological signature of these Upper Triassic and shallow-water/marginal marine sediments. Six sedimentary facies were identified in a mixed siliciclastic and carbonate system. Distinct ichnological signatures, in terms of discrete trace fossils and the ichnofabric, can easily be determined for terrigenous clastic strata as well as for open-marine carbonate sediments. Brackish water facies are characterized by low ichnofabric indexes and low trace fossil diversity. Chondrites is the most common trace fossil in prodelta deposits, although these strata are commonly not bioturbated. Sandstones deposited in high-energy nearshore settings are also not well-bioturbated, whereas open-shelf strata are completely bioturbated. Nearshore coarse-grained facies are more problematic.

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Bioturbation and Trace Fossils in Deep Sea Sediments of the Walvis Ridge, Southeastern Atlantic, Leg 74

Cited by 7 publications

References 8 publications

A suite of early Eocene (~ 55 Ma) climate model boundary conditions

A suite of early Eocene (~ 55 Ma) climate model boundary conditions

Variation of Trace Fossils and Ichnofacies in Neogene and Quaternary Pelagic Sediments from the Eastern Equatorial Pacific Ocean (Leg 138)

Trace Fossils and Ichnofabric in Triassic Sediments from Cores Recovered on Leg 122

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