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- cb277225-be9e-4c22-954e-fe7352e9faa6 definition "The Paleocene is a geological epoch that lasted from about 66 to 56 million years ago (mya). It is the first epoch of the Paleogene Period in the modern Cenozoic Era. The epoch is bracketed by two major events in Earth's history: the K-Pg extinction event and the Paleocene–Eocene thermal maximum. The K-Pg extinction event, brought on by an asteroid impact and an ensuing impact winter, marked the beginning of the Paleocene and killed off 75% of life on Earth, most famously the non-avian dinosaurs. The end of the epoch was marked by the Paleocene–Eocene thermal maximum, which was a major climatic event wherein about 2,500–4,500 gigatons of carbon was released into the atmosphere and ocean systems en masse, causing a spike in global temperatures and ocean acidification. The Paleocene continued many geological processes initiated in Mesozoic, and the continents continued moving towards their present positions. The Northern Hemisphere continents were still connected via some land bridges as well as the Southern Hemisphere continents, the Rocky Mountains were being uplifted, the Americas had not yet joined, and the Indian Plate had begun its collision with Asia. In the oceans, the thermohaline circulation probably was much different than it is today, with downwellings occurring in the North Pacific rather than the North Atlantic, and water density was mainly controlled by salinity rather than temperature. The extinction event caused a floral and faunal turnover of species, with previously abundant species being replaced by previously uncommon ones. With a global average temperature of about 24–25 °C (75–77 °F), compared to 14 °C (57 °F) in more recent times, the Earth had a greenhouse climate without permanent ice sheets at the poles. As such, there were forests worldwide–including at the poles–with low species richness in regards to plant life, populated by mainly small creatures which were rapidly evolving to take advantage of the recently-emptied Earth. Though some animals attained enormous size, most remained rather small. The forests grew quite dense in the general absence of large herbivores. Mammals proliferated in the Paleocene, and the earliest placentals and marsupials are recorded from this time, but most Paleocene taxa have ambiguous affinities. In the seas, ray-finned fish rose to dominate open ocean and reef ecosystems." @default.
- cb277225-be9e-4c22-954e-fe7352e9faa6 id "1648645" @default.
- cb277225-be9e-4c22-954e-fe7352e9faa6 path_id a77f665d-345c-49b0-9e9b-f9f78a1415cc @default.
- cb277225-be9e-4c22-954e-fe7352e9faa6 path_id a9f88ca9-5d19-45fa-8fbb-3c6ff5f1f190 @default.
- cb277225-be9e-4c22-954e-fe7352e9faa6 path_id af145656-986a-4969-bb77-6e5b2cff1ede @default.
- cb277225-be9e-4c22-954e-fe7352e9faa6 path_id db5be985-d8dc-4063-abff-4cbd8eb39653 @default.
- cb277225-be9e-4c22-954e-fe7352e9faa6 path_label "CENOZOIC" @default.
- cb277225-be9e-4c22-954e-fe7352e9faa6 path_label "Chronostratigraphic Units" @default.
- cb277225-be9e-4c22-954e-fe7352e9faa6 path_label "PALEOGENE" @default.
- cb277225-be9e-4c22-954e-fe7352e9faa6 path_label "PHANEROZOIC" @default.
- cb277225-be9e-4c22-954e-fe7352e9faa6 prefLabel "PALEOCENE" @default.
- cb277225-be9e-4c22-954e-fe7352e9faa6 reference "International Commission on Stratigraphy (http://www.stratigraphy.org/)" @default.
- cb277225-be9e-4c22-954e-fe7352e9faa6 tag "Chronostratigraphic Units" @default.