Older Peron
The Older Peron transgression was a period of unusually warm climate
Climate encompasses the statistics of temperature, humidity, atmospheric pressure, wind, rainfall, atmospheric particle count and other meteorological elemental measurements in a given region over long periods...

 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
Dendrochronology or tree-ring dating is the scientific method of dating based on the analysis of patterns of tree-rings. Dendrochronology can date the time at which tree rings were formed, in many types of wood, to the exact calendar year...

 of the bristlecone pine
Bristlecone pine
The bristlecone pines are a small group of pine trees that are thought to reach an age far greater than that of any other single living organism known, up to nearly 5,000 years....

, 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 glacier
A glacier is a large persistent body of ice that forms where the accumulation of snow exceeds its ablation over many years, often centuries. At least 0.1 km² in area and 50 m thick, but often much larger, a glacier slowly deforms and flows due to stresses induced by its weight...

s and ice sheet
Ice sheet
An ice sheet is a mass of glacier ice that covers surrounding terrain and is greater than 50,000 km² , thus also known as continental glacier...

s of the global cryosphere
The cryosphere is the term which collectively describes the portions of the Earth’s surface where water is in solid form, including sea ice, lake ice, river ice, snow cover, glaciers, ice caps and ice sheets, and frozen ground . Thus there is a wide overlap with the hydrosphere...

; 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 lasted for several centuries and eroded coastlines. Several locations around the world have "Older Peron terraces" along their coasts as a result. (The period derives its name from Cape Peron in Western Australia
Western Australia
Western Australia is a state of Australia, occupying the entire western third of the Australian continent. It is bounded by the Indian Ocean to the north and west, the Great Australian Bight and Indian Ocean to the south, the Northern Territory to the north-east and South Australia to the south-east...

, where a terrace from the relevant era is prominent and was a focus of climatological study.)

The Older Peron transgression was one of a series of gradually diminishing marine transgressions during the middle Holocene. It was followed by the Younger Peron, Abrolhos, and Rottnest transgressions. During the Younger Peron transgression (c. 4000–3400 BCE), sea level peaked at 3 meters above the twentieth-century level; during the Abrolhos (c. 2600–2100 BCE), 1.5 meters; and during the Rottnest (c. 1600–1000 BCE), 1 meter.

At least a few commentators — anthropologists, folklorists, and others — have linked era of the Older Peron transgression and the Neolithic Subpluvial
Neolithic Subpluvial
The Neolithic Subpluvial — sometimes called the Holocene Wet Phase — was an extended period of wet and rainy conditions in the climate history of northern Africa...

 with tales of a "time of plenty" (Golden Age
Golden Age
The term Golden Age comes from Greek mythology and legend and refers to the first in a sequence of four or five Ages of Man, in which the Golden Age is first, followed in sequence, by the Silver, Bronze, and Iron Ages, and then the present, a period of decline...

; Garden of Eden
Garden of Eden
The Garden of Eden is in the Bible's Book of Genesis as being the place where the first man, Adam, and his wife, Eve, lived after they were created by God. Literally, the Bible speaks about a garden in Eden...

) that occur in the legendary backgrounds of many cultures.

See also

  • 4.2 kiloyear event
    4.2 kiloyear event
    The 4.2 kiloyear BP aridification event was one of the most severe climatic events of the Holocene period in terms of impact on cultural upheaval. Starting in ≈2200 BC, it probably lasted the entire 22nd century BC. It is very likely to have caused the collapse of the Old Kingdom in Egypt as...

  • 5.9 kiloyear event
    5.9 kiloyear event
    The 5.9 kiloyear event was one of the most intense aridification events during the Holocene. It occurred around 3900 BC, ending the Neolithic Subpluvial and probably initiated the most recent desiccation of the Sahara desert. Thus, it also triggered worldwide migration to river valleys, e.g...

  • 8.2 kiloyear event
    8.2 kiloyear event
    The 8.2 kiloyear event is the term that climatologists have adopted for a sudden decrease in global temperatures that occurred approximately 8,200 years before the present, or c. 6,200 BCE, and which lasted for the next two to four centuries...

  • Marine regression
    Marine regression
    Marine regression is a geological process occurring when areas of submerged seafloor are exposed above the sea level. The opposite event, marine transgression, occurs when flooding from the sea covers previously exposed land....

  • Neolithic Subpluvial
    Neolithic Subpluvial
    The Neolithic Subpluvial — sometimes called the Holocene Wet Phase — was an extended period of wet and rainy conditions in the climate history of northern Africa...

  • Piora Oscillation
  • Sea level
    Sea level
    Mean sea level is a measure of the average height of the ocean's surface ; used as a standard in reckoning land elevation...

  • Sea-level rise
The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.