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

Allyn River Member
Stratigraphic range: Viséan
~346–330 Ma
A cliff above the Allyn River, Australia
TypeGeological formation
Unit ofFlagstaff Formation, Australia
Thicknessup to 1,000 metres (3,280 ft)
Lithology
PrimarySandstone, mudstone
OtherTurbiditic sedimentary structures
Location
Coordinates32°18′29″S 151°30′53″E / 32.308110°S 151.514747°E / -32.308110; 151.514747
RegionHunter Valley
Country Australia
Type section
Named forAllyn River
Named byD.Lindley
Year defined1988
RegionNew South Wales
CountryAustralia
Thickness at type section740
Allyn River Member is located in Australia
Allyn River Member
Allyn River Member (Australia)
Allyn River Member is located in New South Wales
Allyn River Member
Allyn River Member (New South Wales)

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

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  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