This rock is part of the rough emery board-like rock that is under the bluffs. It seems it can be crumbly, but some of it is hardened, as is the rock piece I found today. Here it is with its parent cliff, which had formed a cubby large enough so I could sit there for awhile to watch the ocean again.
I like the texture and the color of this selection today. I am always happy to find striation in a rock as well. I want to learn more about the geological history that gives these rocks their layers. This rock is approx 1 7/8" at the diagonal and
is very gritty.