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Colleagues, I hacked through the Brum Uni website and found the address of the paper in question - the correct link for those interested is http://www.gees.bham.ac.uk/research/petroleumgeoscience/currentresearch/spwe b.htm Nice paper. But I still would maintain that the fault pattern doesn't look anything like those which we see in salt withdrawal basins in the Gulf of Mexico, and we have great data on lots of those. Slumping may be a possibilty but I never saw anything slump like that either - generally we see slumping of part of the basin flanks, not uniform circles around the basin. The syncline (which is being called a salt withdrawal basin, but isn't exactly like the withdrawal basins in the rest of the world) appears to be elongate N-S according to Kens fig. 2, it's not a circular bowl, so it doesn't explain the circularity of the fault pattern. The Silverpit Anomaly's fault pattern doesn't conform to the shape of the syncline. The other synclines on Ken's map don't show fault patterns like the Anomaly. So, I'd say it's still a bit of a mystery. Maybe something impacted smack in the middle of a syncline. Cheers Frank Peel EOM NOTICE - This message and any attached files may contain information that is confidential and/or subject of legal privilege intended only for use by the intended recipient. If you are not the intended recipient or the person responsible for delivering the message to the intended recipient, be advised that you have received this message in error and that any dissemination, copying or use of this message or attachment is strictly forbidden, as is the disclosure of the information therein. If you have received this message in error please notify the sender immediately and delete the message.