Dating topography of the sierra nevada
This chert, formed in volcanic hot springs, preserved several species of early plants in cellular detail by petrification.
Paleozoic Timeline of Plant Evolution (wiki) - Photosynthesis Horseshoe Crab Living Fossil is an extant taxon that closely resembles organisms otherwise known only from the fossil record. Carboniferous is a geologic period and system that spans 60 million years from the end of the Devonian Period 358.9 million years ago (Mya), to the beginning of the Permian Period, 298.9 Mya. Hangenberg Event is a bioevent that occurred at the end of the Famennian epoch (late Devonian) associated with the Late Devonian extinction (roughly 358.9 ± 0.4 million years ago); Bioevent is an event recognised in a sequence of sedimentary rocks, where there is a significant change in the biota as recorded by assemblages of fossils over a relatively short period of time.
The Scale of the Universe from Big to Small (youtube) The Scale of the Universe from Small to Big (youtube) NASA Astronomy Picture of the Day (APOD) The Scale of the Universe - Interactive (manual control scale) Sizes (nano) Stars and Galaxies started to form.
Reionization marks the point at which the hydrogen in the Universe became ionized.
G Plates Earth Byte India broke away from the other fragments of Gondwana and began moving north.The photo above is not to make you feel insignificant, it is only for reference and scale. Depending on your field of view, you would have to be around 100,000 light years away to see this Galaxy using the naked human eye.And as you got closer, it would almost disappear because of the tremendous amount of space there is between everything, like with atoms.As a rule, to be considered a living fossil, the fossil species must be old relative to the time of origin of the extant clade. It has been defined as "short-term (hours or days to kyrs) locally, regionally, or interregionally pervasive changes in the ecological, biogeographical, and/or evolutionary character of biotas that are isochronous or nearly so throughout their range".Bioevents either relate to diversification of a particular fossil group or a reduction, these may equate to speciation events or extinction events, or may only represent migration.