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Oxfordian (Upper Jurassic) coral reefs in Western Europe: reef types and conceptual depositional model

Comparative sedimentology and palaeoecology of Oxfordian (Upper Jurassic) coral‐dominated reefs of England, France, Italy and Switzerland has been used to: (1) identify and characterize different types of Late Jurassic coral reefs with regard to their litho‐ and biofacies; and (2) develop a depositional model for these reefs relating different reef types to each other within a palaeoenvironmental framework. Eight generic reef types and one associated reef facies are recognized. These are: (I) biostromal units dominated by platy microsolenids developed within clean limestone facies; (II) biostromal units dominated by platy microsolenids developed within marly facies; (III) reefal thickets dominated by tall dense phaceloid colonies developed within pure carbonate muds; (IV) microbial‐coral reefs dominated by massive, branching ramose and phaceloid colonies; (V) large high diversity reefal units associated with large volumes of bioclastic material; (VI) small species‐poor reefs developed within mixed carbonate/siliciclastic facies; (VII) microbial‐coral reefs dominated by massive colonies; (VIII) reefal thickets dominated by branching ramose colonies with widely spaced branches developed amongst sand shoals and coral debris channels; and (IX) conglomerates rich in rounded coral fragments (the reef associated facies).