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8423-2 Day Hill

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:
544959. 2 kilometres north of Omeo.

Abstract:
Trachyte intruded by small syenite plug.

Access:
McNamara Road.

Ownership:
Private land.

Geomorphology:
An isolated occurrence of Triassic trachyte and syenite outcrops at Day Hill. The trachytes have been partly metamorphosed by the syenite intrusion. They vary from agglomeritic to fragmental and include occasional sandstone and mafic xenoliths. Associated with the trachyte-syenite complex are a number of dykes. These are predominantly trachytic and are arranged radially around Day Hill. Of particular interest is a dyke in Wilsons Creek, to the north of Day Hill which contains numerous quartz-rich schist xenoliths.

Significance:
Regional. The major rock types representative of the Triassic trachyte-syenite complex occur in close association in Day Hill.

Management:
Limited quarrying on Day Hill could enhance the value of the site by providing additional exposures of the trachyte-syenite complex. However, excavation on a large scale resulting in the removal of a large percentage of the Hill is not recommended. Other land use (e.g. road construction, agriculture) which may produce limited disturbance of the site would not seriously reduce the value of the significant geological features.

References:
Crohn, P.W. 1950. 'The geology, petrology and physiography of the Omeo District, North-Eastern Victoria', Proc. R. Soc. Vict., 62 :1-70.
Vandenberg, A.H.M., and O’Shea, P.J. 1980. 'Explanatory Notes on the Bairnsdale 1:250,000 geological map'. Rep. geol. Surv. Vict., No.65.
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