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10. Thomson Portal Road

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 on the coast of Port Phillip Bay and in the Catchment of Westernport Bay (1984, 88) by Neville Rosengren.
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 (external link) for details of geological heritage reports, and a bibliography.

Location:315277 to 363250. Road cuttings between Whitelaw Creek and the Thomson Portal.

Access:
Thomson Valley Road (Park Road).

Ownership:
Crown Land.

Geology/Geomorphology:
Road cuttings at this site display the bedding and lithologies characteristic of the Bullring Siltstone, Sinclair Valley Sandstone, and the Whitelaw Siltstone. The cuttings include the type sections of the Sinclair Valley Sandstone (330274) and the Bullring Siltstone (350266) and the poorly exposed contact between the Whitelaw Siltstone and the Sinclair Valley Sandstone at 323274.

Significance:
Regional. Site includes the type sections of the Sinclair Valley Sandstone, the Bullring Siltstone, and the contact with the overlying Whitelaw Siltstone.

Management:
Occasional grading of the road cuttings to maintain clear exposures would maintain the value of the site.

References:
VandenBerg , A.H.M. 1975. Definitions and descriptions of middle Ordovician to middle Devonian rock units of the Warburton district, East Central Victoria. Rep. geol. Surv.Vict., 1975/6
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