| The succession begins with a conspicuous brown sideritic crust above the last rich cheiloceratid fauna. |
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| Here, the Nancy sequence consists of 10 m of greenish-gray, silty mudstone and shale with scattered sideritic nodules. |
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| Its down-dip sulfide ores were sideritic and pyritic, with golden barite forming one of the gangue minerals. |
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| At Montceau-les-Mines only five specimens of Amynilyspes have been found up to now out of 23,250 sideritic concretions that have yielded animal remains. |
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| The raw material, a black palaeozoic bituminous sideritic claystone, comes from the Kounov coal seam, which outcrops in an area about 7 x I kin. |
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| It is lithologically represented by brownish-gray clays with jarosite tarnish and inter-layers of gray, fine-grained sandstones, and by marlaceous and sideritic concretions. |
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