atmosphere blue clear cloud clouds crisp cumulous cumulus droplets drops fluffy fresh heaven heavens peace peaceful rain skies weather whispy 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 rays sky sun white