What is it, Giveaway!

I am working on finishing some projects so nothing new today.
This weekend we got some nice walks in and I took some photos of some unique items.

Here are two photos, you can comment on one or both and comments will be entered to win a free ebooklet. I will pick a winner from the comments on Wednesday night.

This is a common site at low tide, what is it?

On the way back, we walk through the woods and  pass this rock. I never noticed the shape before, what does it look like to you?