17 March 2014
Angle of repose in Devonian shale, Corridor H
Posted by Callan Bentley
Where the Needmore Formation is falling apart on Corridor H, sloughed-off shale is piling up in a tiny talus slope:
You could slap a protractor on that photo and get a pretty good measurement of the angle of repose of this chippy, flaky granular material.
Eyeballing it, that looks like about 45° to me.