The stratigraphic implications of Monograptus exiguous from Camp Hill, Canberra, ACT

The Camp Hill Sandstone of Opik (1958) is unconformable not only on the Black Mountain Sandstone but also the State Circle Shale (whose age is established as Late Llandovery by the occurrence of Monograptus exiguus). It is almost certain that the Black Mountain Sandstone overlies the State Circle Shale, and is thus of Late Llandovery age, not Early Ordovician.

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Published (Metadata Record) 04/03/2026
Last updated 05/03/2026
Organisation Australian Federal Government
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