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The iron-ooid interval in Aguilon includes several limestone bands with abundant, small-size, well-sorted ooliths. These layers show a marked lenticular shape and are separated by clear discontinuities (Aurell et al., 1994).
5) were able to demonstrate that the "Gracilis association", recorded in the lower oolitic interval (levels 108 a-c) was in fact a reelaborated entity constituted by fragmented or disarticulated moulds (Fm; Dm), non deformed; maintaining their original shape and volume, and formed by a micritic, non-oolitic (or with few sparse ooliths) infill.
formed by yellow-reddish iron ooid wackestone to packstone, including abundant, thick highly heterometric ferruginous ooliths. Beds show irregular, lenticular bedding underlined by the presence of frequent ferruginous surfaces with local development of hard-ground.
Sandberg (1983, 1985) found that the composition of nonskeletal carbonate precipitates (early marine cements and ooliths) has undergone oscillations during Phanerozoic time: there have been three intervals of aragonite seas (Early Cambrian, Late Carboniferous-Early Jurassic, Oligocene-Recent), and two intervals of calcite seas (Middle Cambrian Early Carboniferous, Middle JurassicEocene) (Stanley 2006).