alps cottage living mountain relax rocks vacations villa wood accretions bio-chemical-accretionary-structures cementation columnar cumulative-structures excretions formations formed forming fossils high-saline-levels lake layered living-fossils living-rocks microbialites microorganisms natural park rock-structure sedimentary-grains shallow-water shaped shapes slow-growth stromatolite stromatoliths structures barnacle barnacles chilly clam clams coast cold creature Crustacean damp life ocean sand sandy sea wet big green reptile small snake