These are mostly pyroclastic deposits from explosive volcanic eruptions, but the "Yarralumla Formation" is a sedimentary mudstone/siltstone formation that was formed around 425 million years ago during the Silurian Period.
These are mostly pyroclastic deposits from explosive volcanic eruptions, but the "Yarralumla Formation" is a sedimentary mudstone/siltstone formation. This sedimentary mudstone/siltstone formation was formed around 425 million years ago during the Silurian Period.