The upper part of the Scunthorpe Mudstone Formation (Sinemurian, Lower Jurassic) beneath the Frodingham Ironstone at Scunthorpe, north-east England, comprises richly fossiliferous mudrocks and limestones. These strata were recently exposed in temporary sections north of Scunthorpe and yielded large numbers of gryphaeid oysters and other invertebrate fossils. Many of the oysters are extensively bioeroded and disarticulated, and locally constitute coarse-grained bioclastic limestones. These features indicate establishment of a periodically agitated, shallow-water, photic setting, presaging deposition of the ooidal Frodingham Ironstone during the culmination of mid-Sinemurian shallowing.

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