Older Peron

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The Older Peron transgression was the name for a period of unusually warm climate during the Holocene Epoch. It began in the 5000 BCE to 4900 BCE era, and lasted to about 4100 BCE (different climate indices at different locations over the globe yield slightly varying chronologies). The Older Peron was a period of generally clement and balmy weather conditions that favored plant growth; in the dendrochronology of the bristlecone pine, which extends back from the modern era to 6700 BCE, the single best year for the growth of the pine was 4850 BCE, early in the Older Peron era.

The Older Peron was a "transgression" in the sense of marine transgression, a period of advancing global sea level. Warm temperatures forced a retreat in the glaciers and ice sheets of the global cryosphere; throughout the period, global sea levels were 2.5 to 4 meters (8 to 13 feet) higher than the twentieth-century average. The higher sea level, lasting for several centuries, effected the erosion of coastlines; various locations around the world have "Older Peron terraces" along their coasts as a result. (The period derives its name from Point Peron in Western Australia, where a terrace from the relevant era is prominent and was a focus of climatological study.)

Starting in 1961[1] it was known as the period of greatest Holocene global sea-level/high-stand during the Holocene Epoch.[2][3] Recent research of the various factors involved in quantifying eustatic sea level, particularly processes relating to ocean siphoning and glacio-hydro-isostatic adjustment, has challenged that the high-stands were globally coherent, and claim the Older Peron sea level was not higher than present.[4][5]

At least a few commentators — anthropologists, folklorists, and others — have linked era of the Older Peron transgression and the Neolithic Subpluvial with tales of a "time of plenty" (Golden Age; Garden of Eden) that occur in the legendary backgrounds of many cultures.

See also[edit]

References[edit]

  • Baker, Robert G. V.; Haworth, Robert J.; Flood, Peter G. (2004). "An Oscillating Holocene Sea-level? Revisiting Rottnest Island, Western Australia and the Fairbridge Eustatic Hypothesis". Journal of Coastal Research 42: 3–14. 
  • Heusser, Calvin J. "Some Comparisons Between Climate Changes in Northwestern North America and Patagonia". Annals of the New York Academy of Sciences 95 (1): 1961. Bibcode:1961NYASA..95..642H. doi:10.1111/j.1749-6632.1961.tb50064.x. 


References[edit]

  1. ^ Fairbridge, Rhodes W. (1961). "Eustatic Changes in Sea Level". Physics and Chemistry of the Earth 4: 99–185. 
  2. ^ Lewis, S. E.; Sloss, C. R.; Murray-Wallace, C. V.; Woodroffe, C. D.; Smithers, S. G. (2013). "Post-glacial sea-level changes around the Australian margin: a review.". Quaternary Science Reviews 74: 115–138. 
  3. ^ Wyrwoll, Karl-Heinz; Zhu, Zhongrong; Kendrick, George; Collins, Lindsay; Eisenhauer, Anton (1995). "Holocene Sea-Level Events in Western Australia: Revisiting Old Questions". Journal of Coastal Research (Special Issue 17): 321–326. 
  4. ^ Mitrovica, J. X.; Peltier, W. R. (1991). "On postglacial geoid subsidence over the equatorial oceans". Journal of Geophysical Research. 
  5. ^ Fleming, Kevin; Johnston, Paul; Zwartz, Dan; Yokoyama, Yusuke; Lambeck, Kurt; Chappell, John (1998). "Refining the eustatic sea-level curve since the Last Glacial Maximum using far- and intermediate-field sites". Earth and Planetary Science Letters 163 (1-4): 327–342.