Tas Walker on October 20th, 2011

Keen students from a Sydney High school examine Ashfield Shale in a road cut in the Blue Mountains north-west of Sydney. It’s an excellent outcrop in a quiet street that can be researched at leisure.
 
The Ashfield Shale directly overlies the Hawkesbury Sandstone which is prominent in the coastal cliffs and freeway cuttings in the Sydney [...]

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