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GL109

Site: GL109Land Unit: Merino Tablelands
Aust. Soil Class.: Episodic, Epipedal, Grey VERTOSOL (confidence level 1)


Soil pit GL109 landscape
    General Land Unit Description:
    This unit consists of the Cretaceous non-marine sandstone of the dissected Merino Tablelands. The tablelands were thought to have formed under swamp conditions and a warm climate. As a result, the soils tend to be high in clay and there tends to be carbon rich seams of charcoal deposits at depth in some of the profiles. The main soil type used to represent this land unit is black cracking clays (Vertosols) that can be sodic at depth. This soil type, along with Black Sodosols, Chromosols and Dermosols, are commonly found in the broad crests or drainage lines. The slopes often consist of Brown Chromosols, Sodosols or Dermosols, although black soils can also occur on the slopes. The lower slopes commonly have Grey Vertosols or Sodosols as the major soil type. The reasonably deep sodic soils on short steep slopes tend to be prone to landslips. The grey soils, in particular are prone to water erosion.

Soil pit GL109 carbon

Site Description:

Geology: Cretaceous non-marine sandstoneLandform pattern: Rolling rises and undulating low hills
Position in landscape: Lower slopeInternal drainage: Imperfectly drained

Soil Profile Morphology

A10-20 cmVery dark greyish brown (2.5Y3/2) medium clay, moderate to strong subangular blocky structure (2-10 mm), very strong consistence when dry, pH 6.7; transition to:

Subsoil
B2120-30 cmDark greyish brown (2.5Y3/2) medium heavy clay, moderate subangular blocky structure (5-10 mm), strong consistence when dry, weathered sandstone fragments are abundant, pH 9.2; transition to:

B2230-45 cmBrownish yellow (10YR6/6) light clay, weak structure (20-50 mm), strong consistence when dry, many medium coal nodules (2-5 mm), pH 9.5; transition to:

B345-60 cmLight yellowish brown (2.5Y6/6) coarse sandy light clay, weak structure (20-50 mm), strong consistence when dry, many medium coal nodules (2-5 mm), pH 9.3;

BC60-80 cmBrownish yellow (10YR6/6) weathered sandstone, siltstone and mudstone.

C80+ cmLight grey (5Y7/2)

Key profile features:

Soil pit GL109 graphs
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