Allyn River Member

Allyn River Member
Stratigraphic range: Viséan ~346–330  Ma PreꞒ Ꞓ O S D C P T J K Pg N
A cliff above the Allyn River, Australia
Type	Geological formation
Unit of	Flagstaff Formation, Australia
Thickness	up to 1,000 metres (3,280 ft)
Lithology
Primary	Sandstone, mudstone
Other	Turbiditic sedimentary structures
Location
Coordinates	32°18′29″S151°30′53″E / 32.308110°S 151.514747°E / -32.308110; 151.514747
Region	Hunter Valley
Country	Australia
Type section
Named for	Allyn River
Named by	D.Lindley
Year defined	1988
Region	New South Wales
Country	Australia
Thickness at type section	740
Allyn River Member (Australia) Show map of Australia Allyn River Member (New South Wales) Show map of New South Wales

The Allyn River Member is a geologic member 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 stratigraphic unit includes green to brown, medium thickly bedded lithic sandstone with turbiditic sedimentary structures and interbeds of brown thinly bedded mudstone. ^{[1] [2]}

See also

• New England Orogen

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