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Sgurr Of Eigg Pitchstone Formation
The Sgurr of Eigg Pitchstone Formation is a volcanic geological formation, formation of late Paleocene age exposed on Eigg, part of the Inner Hebrides in Scotland. It is thought to represent a remnant of a much larger deposit that originated from the Skye igneous centre to the northeast, formed by an eruption, possibly with a Volcanic Explosivity Index, VEI of 6 or greater. Extent Due to its resistance to erosion, the Sgurr of Eigg Pitchstone Formation forms a prominent 3 km long ridge in the southwestern part of Eigg, with the peak of An Sgùrr (Eigg), An Sgùrr at the eastern end and Bidean Boidheach at the western end. The pitchstone is preserved within a paleovalley eroded down into the underlying olivine basalts of the Eigg Lava Formation. It has been correlated with a similar pitchstone that outcrops on Hyskeir, Òigh-Sgeir, a group of rocky islets 30 km west-northwest of Eigg. Lithology The formation is described as a pitchstone. In the TAS classification scheme samples fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleocene
The Paleocene ( ), or Palaeocene, is a geological epoch (geology), epoch that lasted from about 66 to 56 mya (unit), million years ago (mya). It is the first epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name is a combination of the Ancient Greek ''palaiós'' meaning "old" and the Eocene Epoch (which succeeds the Paleocene), translating to "the old part of the Eocene". The epoch is bracketed by two major events in Earth's history. The K–Pg extinction event, brought on by an asteroid impact (Chicxulub impact) and possibly volcanism (Deccan Traps), marked the beginning of the Paleocene and killed off 75% of species, most famously the non-avian dinosaurs. The end of the epoch was marked by the Paleocene–Eocene Thermal Maximum (PETM), which was a major climatic event wherein about 2,500–4,500 gigatons of carbon were released into the atmosphere and ocean systems, causing a spike in global temperatures and ocean acidification. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
