Invertebrate marine fossils from 44 localities within the High Tor Limestone in South Wales occur mainly in distinct molluscan or coral-brachiopod associations. Cluster analysis of the species based upon their mutual occurrence and abundance indicates that three recurring fossil associations (probable communities) are represented; 1, a bellerophontid association characterized by gastropods, bivalves and nautiloids in a lime wackestone; 2, a caninioid association including solitary and colonial corals, productid and large chonetid brachiopods commonly in a lime grainstone; and 3, a Rhipdomella association characterized by orthid and small chonetid brachiopods, solitary rugose corals and bryozoans in a lime packstone.--Modified journal abstract.

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