sheetflood

sheetflood

[′shēt‚fləd]
(hydrology)
A broad expanse of moving, storm-borne water that spreads as a thin, continuous, relatively uniform film over a large area for a short distance and duration. Also known as sheet; sheetwash.
References in periodicals archive ?
Where an assemblage can be shown to have been produced by temporally separate events, it can be subdivided into component trace-fossil suites, for example, where a burrow and a boring cross-cut in a sedimentary rock (pre-omission and post-omission suites, Bromley 1990) or where hypichnial and epichnial trackways occur on a sheetflood sandstone bed (predepositional and postdepositional suites, Han and Pickerill 1994).
Hamblin (2001) encountered similar vertebrate trackways, which could be part of a similar ichnocoenosis, on the base of thin sheetflood sandstones in the Hastings Formation on mainland Nova Scotia.
The hyporelief-preservation of each suite in this ichnocoenosis indicates that the trace fossils were actually produced by members of the floodplain community, the sheetflood preserving the activities of the community as a Lagerstatten.
These mudstones cap the same or similar sheetflood deposits described for ichnocoenosis E, and they are stratigraphically adjacent to incipient pedogenic horizons.
Such upward directed (convex-down menisci) burrows were produced well after the actual sheetflood that produced the current-rippled sandstones in which they are now preserved.
In contrast, Buatois and Mangano (1995, 1998) considered the ichnofacies to be from softground transitional environments; marginal of ephemeral lacustrine settings, sheetflood, or fluvial settings.
A variety of lithofacies are present in strata assigned to the Horton Group in southern New Brunswick, including: alluvial fan, sheetflood, fluvio-deltaic, algal swamp, shoreface, carbonate mudflat, shallow lacustrine, evaporitic lake, and offshore lake.