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31 Black and grey cracking and non-cracking clay soils and seasonally wet soils on Quaternary alluvium

These soils are found on Quaternary alluvium predominantly within the volcanic plains, and are found mainly in low-lying areas such as swamps.

These soils have either self-mulching or at least strongly pedal surfaces of fine clay aggregates which grade into coarse and fine structured strongly pedal heavy clays. The lower subsoil may be less dark or even mottled and grade into a carbonate layer. These soils have high nutrient levels including sodium (sodic). Some may be saturated for at least three months of the year due to topographic and groundwater positions, regarded as waterlogged soils.

Notable characteristics include: high shrink-swell potential, strong structure, self-mulching surfaces, high organic matter content in upper soil, some mottling at depth, and high clay content throughout. They are deep to very deep (>2 m).
CLRA Soil Unit 31

Soil Sites

Site Code
Soil-landform unit
1:100 000 mapsheet
FlatHaplic, Self-mulching, Black VertosolUg5.16T7621 - Colac
Flat?, Epipedal, Brown VertosolUg5.28T7721 - Geelong
FlatEpihyperodic, Self-mulching, Grey VertosolUg5.28T7621 - Colac
FlatMottled, Epipedal, Black VertosolUg5.16T7621 - Colac
FlatEutrophic, Mottled-Subnatric, Black SodosolUg5.16T7621 - Colac
Flat?, Epipedal, Black VertosolUg5.16T7521 - Corangamite
FlatEpisodic, Epipedal, Black VertosolUg5.16T7721 - Geelong
FlatEpiacidic, Epipedal, Black VertosolUg5.16T7521 - Corangamite
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