palaeocurrent


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palaeocurrent

(ˈpælɪəʊˌkʌrənt)
n
(Geological Science) geology an ancient current, esp of water, evidence of which has been preserved in sedimentary rocks as fossilized ripple marks, etc
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References in periodicals archive ?
The sediments dispersal pattern and palaeocurrent directions to the southwest suggest that the steadily uplifting Himalayan orogenic belt, was the main source terrain for the Khojak sediments (Qayyum, et al., 1996, 1997).
Available palaeocurrent data suggest that sediment was supplied from the west and southwest, in agreement with source area location (Fig.
Hussany, Palaeocurrent analysis of the Lower Permian Warchha Sandstone, Karuli Village, central Salt Range, Pakistan.
settling velocity differences in silt grainsize measurements: estimation of palaeocurrent vigour.
The cross-strata dip shows the palaeocurrent direction mostly to 200-240[degrees] (SW), but the direction to the NE is evident too, and some azimuth measurements indicate westerly and southeasterly oriented currents.
Silty marls are dominant in the locality of Ardanatz (central part of the study area), but they contain abundant tabular sandstone beds, which display sharp bases with occasional groove casts (indicating ENE palaeocurrent direction) and gradational upper boundaries; they are rich in carbonaceous plant remains, vertical and horizontal burrows (mainly Ophiomorphids, sensu Seilacher, 2007) and bioclasts (e.g.
The dominant westward palaeocurrent pattern, as shown by the Panjgur succession (Kassi et al.,2003), is parallel to the regional trend and trench axis, which is characteristic of trenches where abyssal plains are incorporated into the accretionary wedges (Dickinson, 1982; Nilsen and Zuffa, 1982; De Roza et al., 1986; Lash, 1986,1987).
Recent palaeocurrent research (Colombo et al., 2012) indicates that the main provenance source for the Del Raton clasts is from the Frontal Cordillera, from the west and northwest from its present outcrops.
In the study region, it consists of sandstones alternating with gray, black and green shales interpreted as a turbiditic succession deposited in a medial to distal submarine fan, with a western to north-western source determined on the basis of palaeocurrent indicators (Munoz Cristi, 1942; Cecioni, 1962, 1974; Charrier, 1977; Rebolledo, 1987; Rivano and Sepulveda, 1991; Rebolledo and Charrier, 1994).
Palaeocurrent indicators, such as cross stratifications and channel axis orientation in the fluvial and deltaic sandstone, indicate sediment supply from the north (Plink-Bjorklund & Bjorklund 1999).