Help needed figuring out these strange sand/mud mounds

[Trailtraipser]

Hello,
I encountered these spectacular mounds- what looks like packed sand and mud on a hillside at elevation 5,435 feet in Washington State. I'm curious if anyone might be able to tell me what they think might have caused them and if they have a proper term?

Much thanks!

 

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[Indian Steve]

Is there more of the mountain above them? Is the land bare uphill of these? Could it be from a landslide? steve

 

[aa battery]

i would say shallow top soil.

 

[Crabs]

My guess is Decomposed Granite.
Topsoil and nutrients can't be absorbed, so nothing grows.

'Crabs

 

[OldNBroken]

wouldn't happen to be in southern washington would it? Say near Mt St Helens?

 

[Shunkaha]

My guess is Decomposed Granite.
Topsoil and nutrients can't be absorbed, so nothing grows.

'Crabs

I agree

 

[Hitndahed]

wouldn't happen to be in southern washington would it? Say near Mt St Helens?

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Ya beat me to it,,, hehheh

Hit