Petrie Formation along the shoreline of Moreton Bay
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Weathered basalt of the Petrie Formation in coastal areas (Redland basalt) is moderately to highly permeable and may form aquifers which store and transmit groundwater through vesicles, fractures and weathered zones. Vertical groundwater movement from a basalt aquifer is often restricted by underlying unweathered bedrock which may have lower permeability. While groundwater will often continue to leak through the less permeable rock to some degree, typically groundwater moves laterally and can be discharged to the surface or offshore along the contact between weathered basalt and underlying less permeable rocks. Where deeply weathered Petrie basalt occurs along the shoreline of Moreton Bay it usually supports a shallow water table, and groundwater often discharges into near-shore marine environments of Moreton Bay.
A range of ecosystems may depend on groundwater within these unconfined, basalt aquifers to support their plant and animal communities, ecological processes and delivery of ecosystem services:
Last updated: 18 December 2015
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Petrie Formation along the shoreline of Moreton Bay, WetlandInfo 2013, Queensland Government, Queensland, viewed 17 May 2018, .