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 Asia Asian Culture Botanical Garden botany Central Asia china decoration geology greyish growth Karst Formation landscape landscape garden limestone mountain nature Ornamental Garden outdoors plant red rock shape small stone Toughness tree architectural architecture bedrock bricks brickwork colors colours formation heritage historic Historic site kiln kilns light lime-kilns patched patchwork repairs rock-work rocks rubble ruins shadows stone-wall stone-work stones structure sunlight surfaced surfaces surfacing texture textured textures variations varied wall walls arch arching brick-walls abstract America amphitheater argentina beautiful beauty canyon color colorful desert dry environment erosion land Morning outdoor sandstone scenic shadow sunrise sunset tourism tourist travel arches stairs steps stone-steps trees vegetation historic-site