i dont have any recent pics but it is mostly small rubble pieces. Nothing too great not a whole lot of coraline. There is one good shelf piece that has some coraline and gsps on it. The gsps might not make it but it is still a nice piece of rock. A black urchin is a sea urchin. They are pretty good scavengers but also poisonous. I havent been stung yet but i have brushed against him several times. As long as you are careful you will be fine.