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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acterised by a bl eached A2 horizon. They form in seep age areas and extensive lateral seepage woul~ account for the bleached A2 horizon (Aldrick> 1976). These soils will remain wet for long periods. Buffalo wal lows were noticed where these soils occur. The permanently wet soils of the drainage floor~ have organic surface gl eyed sand s or cl ays. possibly of the Buldiva horizons overl aying mottl ed ~ They" are humic gley soil s, family. Because of the extent of inundation at the time of th"e survey these soil s could not be observed in detail. Vegetation on _the soils ranges from Melaleuca forest to open sedgeland. 4.4.2 Soils of the Scarps, Steep Hills and Valleys Skeletal soil s are the dominant soil s of these areas. Erosion and mass wast ing are formi ng steep" scarps on the south ern edge of the upland Cretaceous surface. The main rocks are ferruginized sandstq,nes overlaying mudstones which are exposed lower on the slopes. To the north where the upland surface is being dissected (Caiman Land. System) Skeletal soils occur in conjunction with Hotham soil s, the former being confined to the upper slope areas. 4.4.3 Soils of the Undulating Lowland Surface The landscape is much more variable in this area and the variation is reflected in the soil distribution and subsequent ly in the vegetation communities they support. Skeletal soil s occ~r on the ridges and upper slopes within Irgul Land Sys tem. These ridges usually extend south from the scarp of the laterized upland surface. Co]luvial material ha~ infilled the valleys to various extents. In t ~e southwest, deep earthy sand s have formed in Quaternary sand. Only two observations were made but they are probably equival ent to a deep series of the Bowen soil s of Day (1975). Lateritic and yellow podzolics (Croker) occur w}dely throughout the lowlands of southern Cobourg Peninsula. They occur domina~tly in Mountnorris and sub-dominantly in Wangarlu Land System. The se so il shave slow to very sl ow internal dra inage - 26

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