. "It has a maximum recorded thickness of 64 m."@en . "stable"@en . "Where overlain by uppermost Triassic mudstones (Joshua Mudstone Member), the top of the Josephine Sandstone Member is typically a sharp downward transition from mudstone to sandstone (e.g. 30/12b-3). Where the sandstones are overlain by Middle or Upper Jurassic sandstones, the boundary is commonly difficult to identify from lithology alone, but can generally be recognized by a gross change in wireline-log signatures (e.g. 30/1c-5A)."@en . "The base of the Josephine Sandstone Member is defined by a downward change from sandstones to red and variegated silty mudstones (Jonathan Mudstone Member). It is typically marked by a sharp downward increase in gamma-ray values. Where the transition is more gradual, as at 30/1 c-5A, the boundary is taken at a sharp downward increase in density/neutron separation."@en . "227.3"^^ . "201.4"^^ . "Sandstone and trace mudstone and siltstone. Stratified bedrock. Occurs offshore. Deposited during the Norian Age - to - Rhaetian Age (Triassic Period) (227.3-201.4 Ma BP)."@en . . . "Josephine Sandstone Member"@en . . . "The Josephine Sandstone Member is composed of brown and grey, generally clean, very fine, fine, or occasionally medium grained sandstone beds and minor grey, greenish grey and red siltstones and mudstones. Sorting of the sandstones is moderate or good, and many beds form discrete fining-upward units that are up to 20 m thick. Gamma-ray values for the sandstones are characteristically low."@en . "JSSA"@en . . "Josephine Sandstone Member"@en .