bedded chert

bedded chert

[′bed·əd ‚chərt]
(petrology)
Chert of brittle, close-jointed, rhythmically layered character found over large areas in thick deposits, the usually even-bedded layers separated by partings of dark siliceous shale or by siderite layers.
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Trace fossils of a Middle Ordovician pelagic deep-ocean bedded chert in southeastern Australia.
Outcrops of the latter formation on land contain nodular and bedded chert mined by Archaic Indians.
The bedded chert is reddish brown in color and is rich in radiolarian fossils of Early Cretaceous to Turonian in age (Kojima et al.
At present, only 26 taxonomic occurrences of microfossils older than [approximately]2200 Ma meet these criteria: eight from the [approximately]2550-Ma-old Transvaal Supergroup of South Africa (15, 16, 17); two from the [approximately]2750-Ma-old Fortescuse Group of Western Australia (14); three from the [approximately]3400-Ma-old Onverwacht Group of the eastern Transvaal, South Africa (18, 19); and 13 from [approximately]3465-Ma-old units of the Warrawoona Group of Western Australia-two from the Towers Formation (20) and 11 from bedded cherts of the Apex Basalt (4, 5).
Hydrogen and oxygen isotope ratios in nodular and bedded cherts.