The Upper Cambrian Orsten fauna includes fossilized organisms preserved in OrstenOrsten means "stinking stone": the alum shale matrix is rich in organics. lagerstätten, notably at Kinnekulle and in the island of Öland, all in Sweden. The initial site, discovered in 1975 by Klaus Müller and his assistants, exceptionally preserves soft-bodied organisms, and their larvae, who are preserved uncompacted in three dimensions. The fossils are phosphatized and silicified, thus the delicate chitinous cuticle and soft parts are not affected by acids, which act upon the limestone nodule within which the fossils have survived. Acids dissolve the limestone, revealing the microfossils in a recovery process called "acid etching". To recover the fossils, more than one and a half tons of Orsten limestone have been dissolved in acid, originally in a specifically-designed laboratory in Bonn, more recently moved to Ulm. The insoluble residue is scanned by e

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