Movement in Sand

I want to start working with sand, I feel like it leaves such a great mark for movement, footsteps, sweeps, everything turns into a drawing! While I was working in Clifden, the group I was working for brought me to Dog's Bay, an almost tropical beach with a coral reef and white sands! I stumbled across these incredible markings in the sand, that looked like veins or trees. They must have been indents from seaweed being dragged out in the tide.