Unit: P19

image PAL-01

full-size image

Flute casts on the underside of a sandstone bed - a type of bottom structure. Flute casts are formed when the scouring action of a current erodes hollows in a previously deposited muddy layer. These hollows then fill with sand carried by the current. Flute casts are palaeocurrent indicators - the nodal (pointed) end of each is the upstream end, indicating that in this case the current flowed from left to right.

  • How exactly did these structures form? Draw a sketch to show this.

Scale: coin is 21 mm across.

Grid reference: 979 305


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This page is maintained by Roger Suthren

Last Modified: 18 November, 2008