AGW skeptics

Full Version: The Holocene Sea Level Highstand
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From Watts Up With That?

Guest geological note by David Middleton

Most skeptics are familiar with the Warmunist efforts to erase the Medieval Warm Period and Little Ice Age.

[Image: wg1figts-5.gif?w=700&ssl=1]
                                       figure 0. Mann’s infamous Hockey Stick (IPCC, 2001)

However, many skeptics may not be aware of efforts to erase another paleoclimatological feature: The Holocene Highstand.
What is a highstand?

A highstand is one phase of the sea level cycle (AAPG Wiki)
  • Rising
  • Highstand
  • Falling
  • Lowstand
The highstand is the maximum sea level achieved during the cycle.

The Holocene Epoch

The Holocene Epoch was recently formally subdivided into three stages:

  1. Greenlandian Stage = Lower or Early-Holocene. 11.70 ka to 8.33 ka
  2. Northgrippian Stage = Middle or Mid-Holocene. 8.33 ka to 4.25 ka
  3. Meghalayan Stage = Upper or Late-Holocene. 4.25 ka to present
The abbreviation “ka” refers to thousands of years ago. Lower, Middle and Upper are generally used when referring to rock-time units. Early, Mid and Late are generally used when referring to time units (Haile, 1987). Prior to the formal subdivision, Lower/Early, Middle/Mid and Upper/Late were commonly used; however there was no formal nomenclature. The fake word, “Anthropocene” is not used by real geologists.

There is also an informal climatological subdivision of the Holocene:
  • Preboreal 10 ka–9
  • Boreal 9 ka–8 ka
  • Atlantic 8 ka–5 ka
  • Subboreal 5 ka–2.5 ka
  • Subatlantic 2.5 ka–present

Source: Wikipedia


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Lot more in the link with numerous charts and a full reference section on published papers.