| 31. | These consist variously of sandstones, mudstones and siltstones.
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| 32. | The Thomson Formation has steeply dipping beds of greywacke, siltstone and slate.
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| 33. | The Paragua�u is composed of fine-grained sandstones, siltstones and argillites.
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| 34. | The group is a fluvial formation consisting primarily of red siltstones and sandstones.
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| 35. | It is primarily composed of hard sandstone with some inter-bedded siltstone.
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| 36. | The upper reaches of the watershed lie over siltstone.
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| 37. | The Irish Valley Member contains sandstone, siltstone, claystone, and shale.
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| 38. | Sandy siltstone and fine-grained sandstones are interbedded with the aforementioned rock types.
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| 39. | The lowest sediments in this formation are conglomerates, overlain by sandstones and siltstones.
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| 40. | It was the first dam constructed using tertiary sandstone and siltstone as fill materials.
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