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Abstract
Studies of fluvial sequences from the Upper Jurassic and Lower Cretaceous of the Cameros Basin (Spain) and the Upper Cretaceous of the Aquitaine Basin (France) have revealed large numbers of calcrete profiles which have formed wholly or largely through the action of plant root calcification. Those from Spain have formed by the calcification of root mats, whereas those from France resulted from the accumulation of calcified root cells ( Microcodium). These root-related (rhizogenic) calcretes developed in stages allowing developmental time-series (chronosequences) to be identified, contrasting with existing models for calcrete profile growth. They provide unique examples where vegetation has been the dominant control on profile development and probably indicate specific vegetation types and palaeoecological settings. The role of root activity in forming some Quaternary calcretes is also discussed.
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