Photo - Primary
current lineation on bedding plane at Laurel Lake Dam Spillway
Graphic - Flow direction surmised from lineation
Photo and
graphic combined to show paleocurrent direction of primary current lineation
- Linear Features used to Determine Paleocurrent
Direction
- Elongate Ridges 5-20 Grains Thick in Direction
of Flow, Separated by Furrows
- Streaking Pattern Parallel to Flow Direction
- Occurs in both Lower and Upper Flow Regime
- Lower Plane Bed - only Coarse Sands
- Upper Plane Bed - all Grain Sizes
- Upper Plane Bed is often
Best Preserved