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8423-4 Tongio Gap

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:
590880. 10 kilometres north-east of Omeo.

Abstract:
Low saddle in Great Dividing Range.

Access:
Omeo Highway.

Ownership:
Private land.

Geomorphology:
The main drainage divide of the Great Dividing Range exhibit’s a marked asymmetrical form, the south flowing stream valley profiles being steeper than those of the northerly flowing streams. This phenomenon is clearly displayed at Tongio Gap, a low saddle in the Great Dividing Range.

It has been suggested that Tongio Gap together with Cassils Gap to the south were located on old courses of the Mitta Mitta, Cobungra and Victoria Rivers which originally flowed north into the Tambo River. These rivers were later captured by the headwaters of a north-flowing stream, changing the drainage characteristics and isolating Tongio Gap at the stream divide.

Significance:
Regional. The marked asymmetry of the divide is well displayed at Tongio Gap.

Management:
Because of the area covered by the site the value of the geomorphological features is unlikely to be seriously reduced by localized disturbance e.g. sand works, extractive industries or agriculture.

References:
Crohn, P.W. 1950. 'The geology, petrology and physiography of the Omeo District, North-Eastern Victoria', Proc. R. Soc. Vict., 62 :1-70.
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