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Red chalk is early Cretaceous in age. It is chemically very similar to the later & better known white chalk.
Red Chalk (& marl) is now largely a redundant term. This very conspicuous rock is part of the Hunstanton Formation from the Albian stage of the early Cretaceous. In it's upper levels the Red Chalk is micro fossil rich & chemically very similar to the more familiar, overlying, white chalk apart from the presence of finely disseminated haematite. There appears to be a gradual transition between the two lithologies but they are devided by an erosion surface. It can be found along the Yorkshire, Lincolnshire & North Norfolk coast. Our samples come from the Reighton Gap area of N. Yorkshire. Specimens are supplied in labelled card trays.