Around 30 new species of insect have been described from Smokejacks, three of which represent new orders for Smokejacks and the Weald as a whole (archaic earwig, mayfly larvae and ‘ stick insect ’). The upper 10 m are considered to reflect deposition on mudflats and in sluggish river channels and include laterally variable beds of mudstones and sandstones that have yielded the remains of crocodiles, dinosaurs (below third left), land plants (below right), and amber. The lower 15 m are thought to indicate sedimentation in a shallow lake or lagoon in which the salinity fluctuated, and consist of mudstones and shaly mudstones with sporadic occurrences of beds (lenses) of sideritic mudstones and siltstones within which insects (below middle and right), crustaceans (including spinicaudatans (clam shrimps) (above left), ostracods (seed shrimps), and prawns (above second left) ), fish/sharks (above third left and far right) and plants (below left and second left) are preserved. The Sir Charles Lyell Collection at the University of EdinburghĮwhurst Brickworks (Smokejacks) exposes 25 m of sediments within the Early Cretaceous Upper Weald Clay, covering a timespan of around 300,000 years (below left).Proceedings of the Geologists’ Association.Geologists’ Association Photographic Competition.Geologists’ Association Student Symposium.
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