Holocene

Subdivisions of the Quaternary Period System Series Stage Age (Ma) Quaternary Holocene 0–0.0117 Pleistocene Tarantian (Upper) 0.0117–0.126 Ionian (Middle) 0.126–0.781 Calabrian (Lower) 0.781–1.806 Gelasian (Lower) 1.806–2.588 Neogene Pliocene Piacenzian older In Europe and North America, the Holocene is subdivided into Preboreal, Boreal, Atlantic, Subboreal, and Subatlantic stages of the Blytt-Sernander time scale. There are many regional subdivisions for the Upper or Late Pleistocene, usually these represent locally recognized cold (glacial) and warm (interglacial) periods. The last glacial period ends with the cold Younger Dryas substage. Holocene Epoch This box: view · talk · ↑ Pleistocene Holocene Preboreal (10.3 ka – 9 ka), Boreal (9 ka – 7.5 ka), Atlantic (7.5 ka – 5 ka), Subboreal (5 ka – 2.5 ka) Subatlantic (2.5 ka – present) The Holocene is a geological epoch which began approximately 12,000 years ago1 (10 000 14C years ago). According to traditional geological thinking, the Holocene continues to the present. The Holocene is part of the Quaternary period. Its name comes from the Greek words ὅλος (holos, whole or entire) and καινός (kainos, new), meaning "entirely recent". It has been identified with the current warm period, known as MIS 1, and can be considered an interglacial in the current ice age. Human civilization, in its most widely used definition, dates entirely within the Holocene. The word anthropocene is sometimes used to describe the time period from when humans have had a significant impact on the Earth's climate and ecosystems to the present. Contents 1 Overview 2 Geology 3 Climate 4 Ecological developments 5 Human developments 6 Impact events 7 See also 8 References 9 Further reading 10 External links // Overview It is generally accepted that the Holocene started approximately 12,000 years BP (before present day), i.e., around 10,000 BCE. The period follows the Wisconsin glaciation (also known as the Baltic-Scandinavian Ice Age or the Weichsel glacial). The Holocene can be subdivided into five time intervals, or chronozones, based on climatic fluctuations: Preboreal (10 ka – 9 ka), Boreal (9 ka – 8 ka), Atlantic (8 ka – 5 ka), Subboreal (5 ka – 2.5 ka) and Subatlantic (2.5 ka – present). Note: "ka" means "thousand years" (non-calibrated C14 dates) The Blytt-Sernander classification of climatic periods defined, initially, by plant remains in peat mosses, is now of purely historical interest. The scheme was defined for north Europe, but the climate changes were claimed to occur more widely. The periods of the scheme include a few of the final, pre-Holocene, oscillations of the last glacial period and then classify climates of more recent prehistory. Paleontologists have defined no faunal stages for Holocene. If subdivision is necessary, periods of human technological development, such as the Mesolithic, Neolithic, and Bronze Age, are usually used. However, the time periods referenced by these terms vary with the emergence of those technologies in different parts of the world. Climatically, the Holocene may be divided evenly into the Hypsithermal and Neoglacial periods; the boundary coincides with the start of the Bronze Age in European civilization. According to some scholars, a third division, the Anthropocene, began in the 18th century.2 Geology Holocene cinder cone volcano on State Highway 18 near Veyo, Utah. Continental motions due to plate tectonics are less than a kilometre over a span of only 10,000 years. However, ice melt caused world sea levels to rise about 35 m (110 ft) in the early part of the Holocene. In addition, many areas above about 40 degrees north latitude had been depressed by the weight of the Pleistocene glaciers and rose as much as 180 m (600 ft) due to post-glacial rebound over the late Pleistocene and Holocene, and are still rising today. The sea level rise and temporary land depression allowed temporary marine incursions into areas that are now far from the sea. Holocene marine fossils are known from Vermont, Quebec, Ontario, and Michigan. Other than higher latitude temporary marine incursions associated with glacial depression, Holocene fossils are found primarily in lakebed, floodplain, and cave deposits. Holocene marine deposits along low-latitude coastlines are rare because the rise in sea levels during the period exceeds any likely tectonic uplift of non-glacial origin. Post-glacial rebound in the Scandinavia region resulted in the formation of the Baltic Sea. The region continues to rise, still causing weak earthquakes across Northern Europe. The equivalent event in North America was the rebound of Hudson Bay, as it shrank from its larger, immediate post-glacial Tyrrell Sea phase, to near its present boundaries. Climate Temperature variations during the Holocene Paleogeographic reconstruction of the North Sea appr. 9000 years ago during the early Holocene and after the end of the last ice age. Climate has been fairly stable over the Holocene. Ice core records show that before the Holocene there was global warming after the end of the last ice age and cooling periods, but climate changes became more regional at the start of the Younger Dryas. During the transition from last glacial to holocene, the Huelmo/Mascardi Cold Reversal in the Southern Hemisphere began before the Younger Dryas, and the maximum warmth flowed south to north from 11 000 to 7 000 years ago. It appears that this was influenced by the residual glacial ice remaining in the Northern Hemisphere until the later date. The hypsithermal was a period of warming in which the global climate became warmer. However, the warming was probably not uniform across the world. This period ended about 5 500 years ago, when the earliest human civilizations in Asia and Africa were flourishing. This period of warmth ended with the descent into the Neoglacial. At that time, the climate was not unlike today's, but there was a slightly warmer period from the 10th–14th centuries known as the Medieval Warm Period. This was followed by the Little Ice Age, from the 13th or 14th century to the mid 19th century, which was a period of significant cooling, though not everywhere as severe as previous times during neoglaciation. The Holocene warming is an interglacial period and there is no reason to believe that it represents a permanent end to the current ice age. However, the current global warming may result in the Earth becoming warmer than the Eemian Stage, which peaked at roughly 125 000 years ago and was warmer than the Holocene. This prediction is sometimes referred to as a super-interglacial. Compared to glacial conditions, habitable zones have expanded northwards, reaching their northernmost point during the hypsithermal. Greater moisture in the polar regions has caused the disappearance of steppe-tundra. Ecological developments Animal and plant life have not evolved much during the relatively short Holocene, but there have been major shifts in the distributions of plants and animals. A number of large animals including mammoths and mastodons, saber-toothed cats like Smilodon and Homotherium, and giant sloths disappeared in the late Pleistocene and early Holocene—especially in North America, where animals that survived elsewhere (including horses and camels) became extinct. This extinction of American megafauna has been explained as caused by the arrival of the ancestors of Amerindians; though most scholars assert that climatic change also contributed, as well as a cometary bolide event over North America which is theorized to have triggered the Younger Dryas.3 Throughout the world, ecosystems in cooler climates that were previously regional have been isolated in higher altitude ecological "islands." The 8.2 ka event, an abrupt cold spell recorded as a negative excursion in the δ18O record lasting 400 years, is the most prominent climatic event occurring in the Holocene epoch, and may have marked a resurgence of ice cover. It is thought that this event was caused by the final drainage of Lake Agassiz, which had been confined by the glaciers, disrupting the thermohaline circulation of the Atlantic.4 Human developments Bronze bead necklace, Muséum of Toulouse The beginning of the Holocene corresponds with the beginning of the Mesolithic age in most of Europe; but in regions such as the Middle East and Anatolia with a very early neolithisation, Epipaleolithic is preferred in place of Mesolithic. Cultures in this period include: Hamburgian, Federmesser, and the Natufian culture. Both are followed by the aceramic Neolithic (Pre-Pottery Neolithic A and Pre-Pottery Neolithic B) and the pottery Neolithic. See also: Human history Impact events Many meteorite events which occurred in the Holocene have been discovered in Europe, as well as in seas such as the Indian Ocean and near remote Siberia (Tunguska event). It has been speculated that an impact effect such as that represented today by the Burckle crater5 could have dramatically affected human culture in its early history by the creation of megatsunamis, perhaps inspiring deluge or inundation stories such as that of Noah's Flood. See also 8.2 kiloyear event Blytt-Sernander Deluge (prehistoric) Holocene calendar – used to date geological, archaeological, dendrochronological and historical events from the approximate beginning of the Holocene Epoch Holocene extinction Holocene Impact Working Group Neolithic Subpluvial Older Peron Piora Oscillation 10th millennium BC Last Glacial Maximum 1 E11 s Cenozoic Era Prehistory References ^ "International Stratigraphic Chart". International Commission on Stratigraphy. http://www.stratigraphy.org/upload/ISChart2009.pdf. Retrieved 2009-12-23.  ^ Fred Pearce (2007). With Speed and Violence, p. 21. ISBN 978-0-8070-8576-9 ^ "Blast from the Past? A controversial new idea suggests that a big space rock exploded on or above North America at the end of the last ice age," by Rex Dalton, Nature, vol. 447, no. 7142, pages 256-257 (17 May 2007). Available on-line at: http://www.geo.arizona.edu/~reiners/blackmat.pdf. ^ Clarke, G.K.C., Leverington, D.W., Teller, J.T. & Dyke, A.S. 2004. Paleohydraulics of the last outburst flood from glacial Lake Agassiz and the 8200 BP cold event. Quaternary Science Reviews, 23, 389–407. ^ "Meteor 'misfits' find proof in sea". http://www.signonsandiego.com/uniontrib/20061114/news_1n14meteors.html. Retrieved 2006-11-14.  Ogg, Jim; June, 2004, Overview of Global Boundary Stratotype Sections and Points (GSSP's) http://www.stratigraphy.org/gssp.htm Accessed April 30, 2006 Further reading Roberts, Neil (1998). The Holocene: an environmental history (2nd ed.). Malden, MA: Blackwell. ISBN 0631186379.  Mackay, A. W.; Battarbee, R. W.; Birks, H. J. B. et al., eds (2003). Global change in the Holocene. London: Arnold. ISBN 0340762233.  External links Wikimedia Commons has media related to: Holocene Wikisource has the text of the 1911 Encyclopædia Britannica article Holocene. http://extinctanimals.petermaas.nl/ The 8.2 ka event Detecting Holocene changes in thermohaline circulation Quaternary Pleistocene Holocene Early | Middle | Late Preboreal | Boreal | Atlantic | Subboreal | Subatlantic v · d · eGeologic history of Earth  Precambrian (4.57 Gya – 542 Mya) In left column are eons; right column: bold are eras; not bold are periods: Hadean (4.57 – 4 Gya) (informal) Archean (4 – 2.5 Gya) Eoarchean (4 – 3.6 Gya) Paleoarchean (3.6 – 3.2 Gya) Mesoarchean (3.2 – 2.8 Gya) Neoarchean (2.8 – 2.5 Gya) Proterozoic (2.5 Gya – 542 Mya) Paleoproterozoic (2.5 – 1.6 Gya): Siderian (2.5 – 2.3 Gya) · Rhyacian (2.3 – 2.05 Gya) · Orosirian (2.05 – 1.8 Gya) · Statherian (1.8 – 1.6 Gya) Mesoproterozoic (1.6 – 1 Gya): Calymmian (1.6 – 1.4 Gya) · Ectasian (1.4 – 1.2 Gya) · Stenian (1.2 – 1 Gya) Neoproterozoic (1 Gya – 542 Mya): Tonian (1 Gya – 850 Mya) · Cryogenian (850 – 635 Mya) · Ediacaran (635 – 542 Mya) Mya = millions years ago. Gya = billions years ago.  Phanerozoic (542 – 0 Mya) In horizontal bars are eras; in left column are periods; right column: bold are epochs; not bold not italic are ages; italic are chrons:  Paleozoic (542 – 251 Mya) Cambrian (542 – 488.3 Mya) Terreneuvian (542 – 521 Mya): Fortunian (542 – 528 Mya) · Age 2* (528 – 521 Mya) Epoch 2* (521 – 510 Mya): Age 3* (521 – 515 Mya) · Age 4* (515 – 510 Mya) Epoch 3* (510 – 499 Mya): Age 5* (510 – 506.5 Mya) · Drumian (506.5 – 503 Mya) · Guzhangian (503 – 499 Mya) Furongian (499 – 488.3 Mya): Paibian (499 – 496 Mya) · Age 9* (496 – 492 Mya) · Age 10* (492 – 488.3 Mya) Ordovician (488.3 – 443.7 Mya) Early Ordovician (488.3 – 471.8 Mya): Tremadocian (488.3 – 478.6 Mya) · Floian (478.6 – 471.8 Mya) Middle Ordovician (471.8 – 460.9 Mya): Dapingian (471.8 – 468.1 Mya) · Darriwilian (468.1 – 460.9 Mya) Late Ordovician (460.9 – 443.7 Mya): Sandbian (460.9 – 455.8 Mya) · Katian (455.8 – 445.6 Mya) · Hirnantian (445.6 – 443.7 Mya) Silurian (443.7 – 416 Mya) Llandovery (443.7 – 428.2 Mya): Rhuddanian (443.7 – 439 Mya) · Aeronian (439 – 436 Mya) · Telychian (436 – 428.2 Mya) Wenlock (428.2 – 422.9 Mya): Sheinwoodian (428.2 – 426.2 Mya) · Homerian (426.2 – 422.9 Mya) Ludlow (422.9 – 418.7 Mya): Gorstian (422.9 – 421.3 Mya) · Ludfordian (421.3 – 418.7 Mya) Pridoli (418.7 – 416 Mya) Devonian (416 – 359.2 Mya) Early Devonian (416 – 397.5 Mya): Lochkovian (416 – 411.2 Mya) · Pragian (411.2 – 407 Mya) · Emsian (407 – 397.5 Mya) Middle Devonian (397.5 – 385.3 Mya): Eifelian (397.5 – 391.8 Mya) · Givetian (391.8 – 385.3 Mya) Late Devonian (385.3 – 359.2 Mya): Frasnian (385.3 – 374.5 Mya) · Famennian (374.5 – 359.2 Mya) Carboniferous (359.2 – 299 Mya) Mississippian (359.2 – 318.1 Mya): Tournaisian / Early Mississippian (359.2 – 345.3 Mya) · Viséan / Middle Mississippian (345.3 – 328.3 Mya) · Serpukhovian / Late Mississippian (328.3 – 318.1 Mya) Pennsylvanian (318.1 – 299 Mya): Bashkirian / Early Pennsylvanian (318.1 – 311.7 Mya) · Moscovian / Middle Pennsylvanian (311.7 – 307.2 Mya) · Late Pennsylvanian (307.2 – 299 Mya): Kasimovian (307.2 – 303.4 Mya) · Gzhelian (303.4 – 299 Mya) Permian (299 – 251 Mya) Cisuralian (299 – 270.6 Mya): Asselian (299 – 294.6 Mya) · Sakmarian (294.6 – 284.4 Mya) · Artinskian (284.4 – 275.6 Mya) · Kungurian (275.6 – 270.6 Mya) Guadalupian (270.6 – 260.4 Mya): Roadian (270.6 – 268 Mya) · Wordian (268 – 265.8 Mya) · Capitanian (265.8 – 260.4 Mya) Lopingian (260.4 – 251 Mya): Wuchiapingian (260.4 – 253.8 Mya) · Changhsingian (253.8 – 251 Mya)  Mesozoic (251 – 65.5 Mya) Triassic (251 – 199.6 Mya) Early Triassic (251 – 245.9 Mya): Induan (251 – 249.5 Mya) · Olenekian (249.5 – 245.9 Mya) Middle Triassic (245.9 – 228.7 Mya): Anisian (245.9 – 237 Mya) · Ladinian (237 – 228.7 Mya) Late Triassic (228.7 – 199.6 Mya): Carnian (228.7 – 216.5 Mya) · Norian (216.5 – 203.6 Mya) · Rhaetian (203.6 – 199.6 Mya) Jurassic (199.6 – 145.5 Mya) Early Jurassic (199.6 – 175.6 Mya): Hettangian (199.6 – 196.5 Mya) · Sinemurian (196.5 – 189.6 Mya) · Pliensbachian (189.6 – 183 Mya) · Toarcian (183 – 175.6 Mya) Middle Jurassic (175.6 – 161.2 Mya): Aalenian (175.6 – 171.6 Mya) · Bajocian (171.6 – 167.7 Mya) · Bathonian (167.7 – 164.7 Mya) · Callovian (164.7 – 161.2 Mya) Late Jurassic (161.2 – 145.5 Mya): Oxfordian (161.2 – 155.6 Mya) · Kimmeridgian (155.6 – 150.8 Mya) · Tithonian (150.8 – 145.5 Mya) Cretaceous (145.5 – 65.5 Mya) Early Cretaceous (145.5 – 99.6 Mya): Berriasian (145.5 – 140.2 Mya) · Valanginian (140.2 – 133.9 Mya) · Hauterivian (133.9 – 130 Mya) · Barremian (130 – 125 Mya) · Aptian (125 – 112 Mya) · Albian (112 – 99.6 Mya) Late Cretaceous (99.6 – 65.5 Mya): Cenomanian (99.6 – 93.6 Mya) · Turonian (93.6 – 88.6 Mya) · Coniacian (88.6 – 85.8 Mya) · Santonian (85.8 – 83.5 Mya) · Campanian (83.5 – 70.6 Mya) · Maastrichtian (70.6 – 65.5 Mya)  Cenozoic (65.5 – 0 Mya) Paleogene, Neogene and early Pleistocene comprise former Tertiary* (65.5 – 1.8 Mya) period. Gelasian and Calabrian comprise Early Pleistocene (2.588 Mya – 781 kya) subepoch. Paleogene (65.5 – 23.03 Mya) Paleocene (65.5 – 55.8 Mya): Danian (65.5 – 61.1 Mya) · Selandian (61.1 – 58.7 Mya) · Thanetian (58.7 – 55.8 Mya) Eocene (55.8 – 33.9 Mya): Ypresian (55.8 – 48.6 Mya) · Lutetian (48.6 – 40.4 Mya) · Bartonian (40.4 – 37.2 Mya) · Priabonian (37.2 – 33.9 Mya) Oligocene (33.9 – 23.03 Mya): Rupelian (33.9 – 28.4 Mya) · Chattian (28.4 – 23.03 Mya) Neogene (23.03 – 2.588 Mya) Miocene (23.03 – 5.332 Mya): Aquitanian (23.03 – 20.43 Mya) · Burdigalian (20.43 – 15.97 Mya) · Langhian (15.97 – 13.82 Mya) · Serravallian (13.82 – 11.608 Mya)  · Tortonian (11.608 – 7.246 Mya)  · Messinian (7.246 – 5.332 Mya) Pliocene (5.332 – 2.588 Mya): Piacenzian (5.332 – 3.6 Mya) · Zanclean (3.6 – 2.588 Mya) Quaternary (2.588 – 0 Mya) Pleistocene (2.588 Mya – 11.4 kya): Gelasian (2.588 – 1.806 Mya) · Calabrian (1.806 Mya – 781 kya) · Middle Pleistocene / Ionian (781 – 126 kya) · Late Pleistocene / Tarantian (126 – 11.4 kya): Oldest Dryas* (18 – 14.67 kya) · Bølling* (14.67 – 14 kya) · Older Dryas* (14 – 13.7 kya) · Allerød* (13.7 – 12.8 kya) · Younger Dryas* (12.8 – 11.4 kya) Holocene (11.4 – 0 kya): Preboreal* (11.4 – 9 kya) · Boreal* (9 – 8 kya) · Atlantic* (8 – 5 kya) · Subboreal* (5 – 2.5 kya) · Subatlantic* (2.5 – 0 kya) kya = thousands years ago. Mya = millions years ago. * Not officially recognized by the I.C.S. Source: International Stratigraphic Chart. International Commission on Stratigraphy. Retrieved 8 February 2008.