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 ?
It is unclear whether Jinonicella was dispersed to these remote terranes by palaeocurrents after the Ordovician--Silurian mass extinction event or if it was already present there in the Ordovician, but not discovered yet.
Palaeocurrents data, mainly from tabular bedforms of relatively thick sets in both sheet sandstones and channels, present three main orientations (tridirectional pattern; E, W and SW; Fig.
Available palaeocurrent data suggest that sediment was supplied from the west and southwest, in agreement with source area location (Fig.
The dominantly south to south-west palaeocurrents in Siwalik rocks in the Trans-Indus area (Cerveny et al., 1989) further support the existence of an active drainage system there, which flowed toward the Indus submarine fan during that time.
Small grooves were identified at the base of some conglomerate beds, indicating NNW-SSE palaeocurrents.
The uppermost thick sandstone levels display cross-stratification generated by hydraulic dunes, indicating palaeocurrents from the W and WNW.
Sandy materials with a fine to medium grain-size are well sorted, displaying several cross-laminations and basal marks that indicate NW-SE palaeocurrents. Polygenic and polymodal conglomerates change laterally to more muddy materials towards the S and E (Figs.