Processes of transport and sedimentary structures - Flows, Sediment and Bedforms - Plane bedding and planar lamination
4 important questions on Processes of transport and sedimentary structures - Flows, Sediment and Bedforms - Plane bedding and planar lamination
What is plane bedding in sediments and which sedi strucutre do they form in sedi rocks?
Sedi struc: planar lamination
Name two conditions under which plane bedding is formed and explain why ripple and dunes cannot form under these conditions.
Plane beds form in coarser sands at relatively low flow velocities.
Name two conditions under which plane bedding forms well/poorly defined planar lamination
Plane beds form in coarser sands at relatively low flow velocities. Poorly defined horizontal planar lamination.
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Explain what primary current lineation (pcl) is and how this relates to the conditions under which planar lineation forms.
The bed surface is also marked by elongate
ridges a few grain diameters high separated by furrows oriented parallel to the flow direction.
it is formed by sweeps within the viscous sublayer that push grains aside to form ridges a few grains high which lie parallel to the flow direction. The formation of sweeps is subdued when the bed surface is rough and primary current lineation is therefore less well defined in coarser sands.
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