| 11. | Instead domestic oil shales were heated to produce the needed petrol.
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| 12. | They are underlain by a small ridge of resistant Cretaceous shale.
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| 13. | These sedimentary deposits were over time compressed into shale and sandstone.
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| 14. | The State Circle Shale is composed of laminated shales and siltstone.
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| 15. | The State Circle Shale is composed of laminated shales and siltstone.
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| 16. | Flysch consists of repeated sedimentary cycles with upwards shale / mudstone.
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| 17. | There are, however, a few small areas of shale.
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| 18. | The younger date is from the early Silurian Birkhill shale formations.
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| 19. | Calcareous shales from the Canberra Formation is overlain by Quaternary alluvium.
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| 20. | The dam foundations are weathered Devonian conglomerates, sandstones and shales.
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