Anyone know what this kind of rock is?

Anyone know what this kind of rock is?

Location
WashingtonSnoqualmie RegionRampart Ridge Lakes Trail
Photographer
Catherine Hovell
Date taken

Comments

  • No - but it looks like the rock formed at the bottom of a sea - lots of shells and bones from sea creatures.

    — Peter Hovell

  • Andrew's guess was petrified palm. It looked like it had been struck a lot, like when you hit a rock with a trekking pole and it leaves a scratch. But way too much for that to actually be the cause.

    — Catherine Hovell