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
References in periodicals archive ?
The published paleocurrent data indicate the supply of sediments took placefrom theAravali Ranges, India.
The sedimentological work was completed with the collection of paleocurrent data and the analysis of vertical variability of grain-clast sizes.
This is consistent with paleocurrent data that suggest a northwestward (present-day coordinates) flow direction, with the source region to the SE and a deep basin to the NW (Schenk 1970; Waldron et al.
Two dominant paleocurrent directions, one to the north another to the south, is determined.
Thus, we verified the lateral and vertical communication between U3U/L, U4, 5U sands, besides this, the paleocurrent direction of the sediments was determined towards the northeast and the paleoenvironment deposition was defined as coalescence braided fluvial channels plain in a monocline structure with a soft dip of 50 NE, with a normal adjustment fault system dipping towards the north, associated to a main normal fault with south dip.
The measurement were analyzed using variable constraints system by calculating the Mean Vector Azimuths (MVA) and variables of the cross bedded units of the Ajali Sandstone (Steinmetz,1962) in order to determine the paleocurrent of the Ajali Sandstone as well the trend of the paleocurrent by constructing rose diagram.
Nautiloids and current ripples as paleocurrent indicators in Upper Ordovician limestones, Anticosti Island, Canada.
Petrofabric, the study of the preferred alignment of minerals and rocks, is used as a proxy measurement for paleocurrent directions in sedimentary rocks, emplacement flow directions in igneous rocks, and strain directions in deformed and metamorphosed rocks.
The evidence typically cited in support of a braided stream model includes prevalence of massive or planar-bedded conglomerate and cross-bedded sandstone, low paleocurrent dispersion, and lack of characteristic vertical sequences such as point-bar sequences seen in meandering streams.
Accordingly, the composition of the lower Genna Selole Fm, as well as its thickness and paleocurrent directions, allows us to provide evidence for the morphology of the main high, and to highlight minor horsts and grabens over its surface (Fig.