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- W1981724073 abstract "Separate laminae of 1–6 mm thickness from a microcrystalline quartz-mica-calcite-bearing sedimentary rock sample from the Middle Marker Horizon of the Onverwacht Group, show concordant Rb-Sr ages within experimental error. A statistical treatment of the data gives an extrapolated value for initial87Sr/86Sr of0.7015 ± 0.0018 (2σ) and an apparent age value of3355 ± 70 (2σ) my, based on87Rbλ = 1.39 × 10−11yr−1. The low initial ratio suggests tha effect of metamorphism has been slight and that this data may be fairly close to the time of deposition of the sediments. The Onverwacht Group is of interest because it is the oldest well-preserved sedimentary-volcanic sequence known, and contains an aromatic-type kerogen and microstructures of unknown origin which morphologically resemble fossil algae." @default.
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- W1981724073 date "1972-04-01" @default.
- W1981724073 modified "2023-10-14" @default.
- W1981724073 title "Ancient age of the Middle Marker Horizon, Onverwacht Group, Swaziland Sequence, South Africa" @default.
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- W1981724073 doi "https://doi.org/10.1016/0012-821x(72)90137-9" @default.
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