SILURIAN FACIES BENEATH EAST-ANGLIA

Core material from proven or probable Silurian sedimentary rocks benea th East Anglia has been re-examined. Four recognizable facies probably represent an environmental transition from anoxic basin slope or oute r shelf through oxygenated outer shelf to storm-dominated inner shelf. This transition could have occurred laterally, from east to west acro ss the Anglian Basin, or in time, from Llandovery (early Silurian) up to Pridoli (late Silurian). Partial biostratigraphical constraints all ow either interpretation, but the regional setting favours a marked fa cies transition through time as the Anglian Basin shallowed prior to t he Acadian Orogeny. Reddening of the Silurian is mostly secondary bene ath the sub-Triassic unconformity.