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First published in 1981, this is an early exploration of the idea that was to become the author's "Discworld" series. The Company builds planets. A high-ranking official, Kin Arad, discovers that two of her employees have placed a fossilized plesiosaur in the wrong stratum.

Strata 1994, Doubleday, London

ISBN-13: 9780385404754

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Strata 1983, Roc

ISBN-13: 9780451121479

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Strata 1982, New English Library Ltd, London

ISBN-13: 9780450049774

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Strata 1981, Colin Smythe Ltd, Bucks

ISBN-13: 9780901072917

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