Exceptionally preserved fossils are described from the Westhoughton opencast coal pit near
Wigan, Lancashire, UK (uppermost Westphalian A, Lower Modiolaris Chronozone, regularis faunal
belt). The fossils occur within sideritic concretions in a 1.5-metre zone above the Wigan Four Foot coal
seam. Arthropods dominate the fauna and include arachnids, arthropleurids, crustaceans, eurypterids,
euthycarcinoids, millipedes and xiphosurans. Vertebrates are represented by a single palaeoniscid fish,
numerous disarticulated scales and coprolites. Upright Sigillaria trees, massive bedded units and a
general lack of trace fossils in the roof shales of the Wigan Four Foot coal seam suggest that deposition
of the beds containing these concretions was relatively rapid. Discovery of similar faunas at the
equivalent stratigraphic level some distance away point to regional rather than localized controls on
exceptional preservation.