Continuous seismic reflection profiling has identified three seismic facies in the Lundy Tertiary basin, Bristol Channel. One facies is widespread and is interpreted as evidence of floodplain sedimentation. A second facies represents a braided sand/gravel channel network, located only at the south and east margins; this facies probably underlies the floodplain deposits in most of the basin. The third facies occurs only in two sub-basins in the north and represents alluvial channels and bars. The age of this facies is uncertain; present evidence suggests a Neogene age. Bedrock in this region has been planated extensively as a result of Pliocene-Pleistocene transgressions and regressions, and the third facies has been preserved as a result of extension and subsidence arising from movement along the Sticklepath Fault and by downthrow within two major trough faults which branch off the Sticklepath Fault. © 1987, The Geologists' Association. All rights reserved.
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