Territory Stories

The land resources of Cobourg Peninsula



The land resources of Cobourg Peninsula

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by B. Wood and D. Sivertsen


Wood, B.; Sivertsen, D.; Conservation Commission of the Northern Territory


E-Publications; E-Books; PublicationNT




Cobourg Peninsula


Made available via the Publications (Legal Deposit) Act 2004 (NT).; This report describes a land system survey over the Cobourg Peninsula broadly describing landform, soils and vegetation to assist the effective planning and management of the area as a National Park.



Table of contents

1. Introduction -- 2. Summary Descriptions -- 3. Land Systems -- 4. Soils -- 5. Vegetation -- Appendices -- Acknowledgements.




Land use -- Northern Territory -- Cobourg Peninsula; Vegetation mapping -- Northern Territory -- Cobourg Peninsula

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Conservation Commission of the Northern Territory

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iv, 80, [6] p. : col. ills. ; 30 cm.

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http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=2DBCB77120E006B6E040CD9B0F274EFE; http://www.ntlis.nt.gov.au/metadata/export_data?type=html&metadata_id=2DBCB77120E006B6E040CD9B0F274EFE [NTLIS Metadata Tool]

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(ii) As the surface becomes dissected, especially in the north of Cobourg Peninsula, the soil becomes shallower and gravel contents increase to become significant ( 10%) throughout the profile. Hotham, Giles and Skeletal Soils occur in these areas. Hotham soils are essentially shallow to moderately deep red earths occurring on the crests and upper slopes. They are well drained, with high proportions of ferruginous gravel throughout. They are forming on laterite and bauxite. Shallow phases often lie directlyon hard laterite and are an intergrade to Skeletal soils. Lower down the slope where there is poorer drain~ge, lateritic yellow earths of Giles family occur. These soils are mottled and gravelly throughout. They are intergrades to the 'lateritic' yellow podzolic soils (Croker) in some situations. Sandy Cahill soils described on Croker Island (Day 1975) forming on bauxite possibly occur on Cobourg, although they were not identified during this survey. A loamy equivalent was identified and examples are included in the Piso family. These soils form on bauxitic materials, have a softer consistence, and higher percentages of gravels thoughout the profile than Cahill soils on Croker Island. Often, closed monsoonal forests occur on these soils due to their low position in the landscape and probable increased water availability. Further work is needed to determine the extent and significance of this other family of "later itic" red earths. (iii) The soils of the drainage areas within the upland surface are siliceous sands (Kapalga) and poorly drained humic gleys (Buldiva). Kapa1ga soils are shallow to moderately deep, pale, siliceous sands fringing the main drainage floors. They abruptly overly mottled clay which is thought to be the mott1 ed or pall id zone of the s tan dard laterite weathering profile. Kapa1ga soils are possibly formed by colluvial accumulation and are char - 25

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