Flute cast: (geology) A raised, oblong, or subconical welt on the bottom surface of a siltstone or
sandstone bed formed by the filling of a flute.
a
Flute casts are irregular ridges that display a marked asymmetry. The asymmetry of these structures
allows for determination of paleocurrent direction—flows originate from the direction of the steeper
side of the flute. Flute casts typically have a "pointy" end, oriented in the upstream direction, and a
more gentle, flared end that merges downstream into the bed surface. Flute casts along the base of
a given bed are usually of approximately the same size, but between beds or formations, may vary
greatly in size.
Byddwn yn ddiolchgar am unrhyw gymorth.
Siân
|