Petrified fossilized forest. Algal stromatolite can be observed upon stumps. Oncolite is sedimentary structures composed of oncoids, which are layered structure formed by cyanobacterial growth. Silicon thrombolite jurassic miocene paleoclimate volcanic eruption oncoid earth soil rock strata surface timescale chemofossil biochemical paleontology escalante state park utah purbeck dorset curio bay gilboa santa cruz deseado specimen ridge sarmiento lesbos jaramillo national ginkgo wanapum recreational area cracked bole branch body agatized log prehistoric times macro slider dolly wide angle tree trunks petrified wood geological heritage age silicified trunk fossil protocupressinoxylon purbeckensis dendrochronology UHD 4K 3840×2160.