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8223-6 Long Hill - Mt Ligar

This information has been developed from the publications:

    • Sites of Geological and Geomorphological Significance in Central Gippsland (1981) by Neville Rosengren, M.S McRae-Williams and S.M Kraemers.
    • Sites of Geological and Geomorphological Significance in the Gippsland Lakes Catchment (1984) by Neville Rosengren.
    • Sites of Geological and Geomorphological Significance in East Gippsland, Victoria (1981) by Neville Rosengren, M.S McRae-Williams
Geological heritage sites, including sites of geomorphological interest and volcanic heritage sites, are under regular revision by the Geological Society of Australia, especially in the assessment of significance and values. Reference should be made to the most recent reports. See the Earth Science Heritage section of the Geological Society of Australia website for details of geological heritage reports, and a bibliography.




Location:
640530. 9 kilometres west of Mt Tamboritha.

Image: East Gippsland Sites of Significance
 Avon River Group sediments forming escarpments on Long Hill and Mount Ligar.

Abstract:
Plateau surrounded by cliffed escarpment.

Access:
Foot track from Bennisons Plains Road.

Ownership:
Crown land east of the Macalister river, private land to the west of the river.

Geology:
The structure and lithology of the western Snowy Plains Formation sediments are clearly exposed in cliffs surrounding Long Hill and Mt Ligar. The sandstones, siltstones and mudstones of this Formation are gently folded, Long Hill and Mt Ligar occurring on the western limb of a shallow syncline with the anticlinal axis occurring between Long Hill and the Macalister River. The dip of the bedding steepens to 30 degrees to 30 degrees west of the anticlinal axis.

Geomorphology:
The flat-topped plateau of Long Hill is in contrast to the pinnacle of Mt Ligar. These features represent the remnants of an older more extensive land surface which has survived the widespread dissection results from rapid down cutting by the streams and creeks of the area. Long Hill is surrounded by scarps, and a narrow razorback ridge extends to Mt Ligar. The escarpment is benched in several places as a result of differential erosion, along bedding plains of less resistant lithologies.

Of additional interest, is the occurrence of a sinuous strike ridge composed of Snowy Plains Formation sediments, which is prominent to the west of the Macalister River.

Significance:
State. The isolated plateau of Long Hill, formed on Snowy Plains Formation sediments is an unusual feature and of considerable interest. Cliffed escarpments, minor river gorges, folded sedimentary beds and a prominent strike ridge are features of additional significance.

Management:
Because of the area covered by the site the value of the significant geological and geomorphological features cannot be seriously reduced by localized disturbance.

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