Abstract
Abstract The Aalenian (Jurassic) oolitic iron ore-bearing formation of Haute-Marne, France, is subdivided on the basis of a detailed paleontologic and sedimentologic study. Thirteen units are described in a section exposed at Maisoncelles. Thin sections of sediments from each horizon show that five principal microfacies can be distinguished--micaceous clay; oolitic iron ore with a calcareous marly gangue rich in shell fragments; oolitic iron ore with a more calcareous gangue and abundant quartz grains; sandy limestone, impregnated with hematite and rich in quartz; and detrital limestone rich in fossil fragments. Formation of the oolites is attributed to encrustation of the shell fragment or fragments forming the nucleus as the nucleus was rolled in the thin film of ferric gel on the bottom of the depositional basin. Associated hematite indicates an oxidizing shallow depositional environment.
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