| 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″S 151°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 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.
See also
References
- "Allyn River Member". Geo Science Australia. Australian Government. Retrieved 16 October 2020.
- 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
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