page_title: Wianamatta Shale
section_title: Geology
hierarchical_section_title: Wianamatta Shale / Geology
caption_attribution_description: Vegetation on Prospect Hill on sandstone.
context_page_description: Wianamatta Shale is a geological feature of the Sydney Basin, New South Wales, Australia. The Wianamatta Group directly overlies the older Hawkesbury sandstone. The shales generally comprises fine grained sedimentary rocks such as shales and laminites with less common sandstone units.
context_section_description: The Wianamatta Group is the youngest geological layer member of the Sydney Basin, and therefore lies at the highest point as the highest layer member. It was deposited in connection with a large river delta, which shifted over time from west to east. This is evidenced by the sequence of strata, which clearly show the transition from marine deposits in front of the delta to deposits on land: Ashfield shale was formed from clayey marine sediments. The subsequent Minchinbury Sandstone emerged from beach - Nehrungs Islands. The Bringelly shale became alluvial in a marshy plain deposited on the delta, meandered through the rivers, and deposited sand at various locations, each of which was narrowly defined, which later solidified into sandstone.
caption: Wianamatta Shale on Prospect Highway, Pemulwuy.
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