Allyn River Member

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Allyn River Member
Stratigraphic range: Viséan
~346–330  Ma
Allyn River Cliffs.jpg
A cliff above the Allyn River, Australia
Type Geological formation
Unit of Flagstaff Formation, Australia
Thicknessup to 1,000 metres (3,280 ft)
Lithology
Primary Sandstone, mudstone
OtherTurbiditic sedimentary structures
Location
Coordinates 32°18′29″S151°30′53″E / 32.308110°S 151.514747°E / -32.308110; 151.514747
RegionHunter Valley
CountryFlag of Australia (converted).svg  Australia
Type section
Named for Allyn River
Named byD.Lindley
Year defined1988
Region New South Wales
CountryAustralia
Thickness at type section740
Australia relief map.jpg
Dark Green 004040 pog.svg
Allyn River Member (Australia)
Australia New South Wales relief location map.png
Dark Green 004040 pog.svg
Allyn River Member (New South Wales)

The Allyn River Member is a geologic formation in the New England Orogen in eastern Australia.

Seen in the Hunter River region near Dungog, this stratum is up to 1,000 metres thick, though 740 metres thick at its type locality. Formed in the Visean between 346.7 and 330.9 Ma., it is part of the Flagstaff Formation of sedimentary rocks.

This formation includes green to brown, medium thickly bedded lithic sandstone with turbiditic sedimentary structures and interbeds of brown thinly bedded mudstone. [1] [2]

See also

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References

  1. "Allyn River Member". Geo Science Australia. Australian Government. Retrieved 16 October 2020.
  2. Roberts, J., Engel, B., Lennox, M., Chapman, J., 1991, Dungog, New South Wales 1:100 000 Geological Sheet 9233, Geological Survey of New South Wales. 1:100,000 geological sheet series, 1v, Map