Sequenzstratigraphie

Schäfer, Andreas

doi:10.1007/978-3-662-57889-6_5

Cited by 2 publications

(5 citation statements)

References 153 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The overlying supratidal sands (FA5) were deposited on the beach surface above high-tide level. Small ripple structures between the supratidal and the underlying intertidal deposits indicate the high-tide line, or beach berm, thus marking the position of maximum tidal flooding (Schäfer, 2010). There is no evidence of aeolian dune deposition within the Neurath Sand.…”

Section: Discussionmentioning

confidence: 99%

“…However, the absence of hummocky cross-stratification (generally characteristic of storm-induced sedimentation, and completely absent throughout the Lower Rhine Basin) might suggest an absence of storm activity. On the other hand, the presence of Groden bedding (which forms as a result of storm surges inundating coastal marshes; Boersma, 1991; Schäfer et al, 2004; Bungenstock & Schäfer, 2009; Schäfer, 2010) in the underlying Frimmersdorf Sand would suggest that storm deposition did indeed occur within the Lower Rhine Basin. Additionally, hummocky cross-stratification may be deformed or destroyed due to tides or storm wave activity (Eyles & Clark, 1986).…”

Section: Discussionmentioning

confidence: 99%

“…In the marked absence of both, it would appear more feasible to conclude that the transition represents a phase of shallowing within the broader depositional setting. The presence of tidal bundles (occasionally including both flood and ebb couplets; Hovikoski et al, 2005; Schäfer, 2010) in FA1c would confirm the subtidal setting. Trough cross-lamination may be indicative of wave activity; thus, FA1c was probably deposited within a ridge-and-runnel system below the low-tide line.…”

Section: Facies Associations In Sediment Profilesmentioning

confidence: 95%

“…However, due to wave activity, tidal currents or the influence of an estuarine system, dunes may also be orientated perpendicular to the shoreline (Dalrymple et al, 2012). On top of these dunes, wave activity can lead to the deposition of high-energy parallel, or planar cross-lamination (Schäfer, 2010). Horizontal surfaces between individual trough cross-laminated sections formed as a result of the erosion of the upper part of dunes, followed by the build-up of new sand dunes on top (i.e.…”

Section: Sedimentary Facies and Facies Analysismentioning

confidence: 99%

See 3 more Smart Citations

Facies analysis and depositional model of the Serravallian-age Neurath Sand, Lower Rhine Basin (W Germany)

Prinz

Schäfer

McCann

et al. 2017

Netherlands Journal of Geosciences

View full text Add to dashboard Cite

The up to 60 m thick Neurath Sand (Serravallian, late middle Miocene) is one of several marine sands in the Lower Rhine Basin which were deposited as a result of North Sea transgressive activity in Cenozoic times. The shallow-marine Neurath Sand is well exposed in the Garzweiler open-cast mine, which is located in the centre of the Lower Rhine Basin. Detailed examination of three sediment profiles extending from the underlying Frimmersdorf Seam via the Neurath Sand and through to the overlying Garzweiler Seam, integrating both sedimentological and palaeontological data, has enabled the depositional setting of the area to be reconstructed.Six subenvironments are recognised in the Neurath Sand, commencing with the upper shoreface (1) sediments characterised by glauconite-rich sands and an extensive biota (Ophiomorphaichnosp.). These are associated with the silt-rich sands of a transitional subenvironment (2), containingSkolithos linearis, Planolitesichnosp. andTeichichnusichnosp. These silt-rich sands grade up to the upper shoreface subenvironment (1), which is indicative of an initial regressive trend. The overlying intertidal deposits can be subdivided into a lower breaker zone (3), characterised by ridge-and-runnel systems, and the swash zone (4) where the surge and backwash of waves resulted in the deposition of high-energy laminites. The intertidal deposits were capped by aeolian backshore sediments (5). Extensive root traces present in this latter subenvironment reflect the development of the overlying peatland (i.e. Garzweiler Seam). Within the Garzweiler Seam, restricted sand lenses indicate a lagoonal or estuarine depositional environment (6). Regional correlation with adjacent wells establishes that shallow-marine conditions were widespread across the Lower Rhine Basin in middle Serravallian times. The shoreline profile, characterised by both tidal and wave activity and influenced by fluvial input from the adjacent Rhenish Massif, is indicative of the complexity of the coastal depositional setting within the Lower Rhine Basin.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Facies Associations In Sediment Profilesmentioning

confidence: 95%

Section: Sedimentary Facies and Facies Analysismentioning

confidence: 99%

See 2 more Smart Citations

Facies analysis and depositional model of the Serravallian-age Neurath Sand, Lower Rhine Basin (W Germany)

Prinz

Schäfer

McCann

et al. 2017

Netherlands Journal of Geosciences

View full text Add to dashboard Cite

show abstract

“…Dalrymple et al, 1992). Consequently, estuaries are most abundant during warm, interglacial periods when continental ice masses recede and global sea level is high (Kennish, 1976;Schäfer, 2020). On a geological timescale, most estuaries persist for only a few thousands to a few tens of thousands of years.…”

Section: Introductionmentioning

confidence: 99%