The Phanerozoic oolitic ironstone in southern and eastern China occurs in the strata ranging in age from Middle Ordovician through Middle and Late Devonian to Early and Middle Jurassic times, especially in the Late Devonian strata where almost 70.
我国显生宙鲕铁石主要分布在我国中南、西南,其次为华东地区,主要产于中奥陶世,中、晚泥盆世,早、中侏罗世地层中,以晚泥盆世最为重要,其矿石储量占70。