| 1. | These are made up from blue-green crystal tuff.
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| 2. | Rhyodacitic ignimbrite is in the form of grey rhyodacitic and dacitic crystal tuff of upper Silurian age.
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| 3. | The fired clay of Tonque is of cream to light orange color with a crystal tuff tempering.
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| 4. | The east of the suburb exposes Mount Painter Volcanics dark grey to green grey dacitic crystal tuff and agglomerate.
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| 5. | The next layer is the Little Mount Pleasant formation, which is composed of crystal tuff and banded rhyolite.
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| 6. | The Big Scott Mountain formation consists of rhyolite of variable composition, lapilli-tuff, and crystal tuff.
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| 7. | To the west of Williamsdale is an outcrop of Upper Silurian Laidlaw Volcanics dark grey rhyodacitic and dacitic crystal tuff.
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| 8. | The middle member consists of rock ranging from nearly aphyric tuff at the base to crystal tuff near the top.
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| 9. | The tuffs consist partly only of magmatic crystals ( crystal tuffs ) and contain broken pieces of wehrlite and syenite.
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| 10. | The lower member consists mainly of unwelded ( unjoined ), but heavily compacted, pumiceous lapilli-tuff and crystal tuff strata.
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