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On the sign:
IN THIS HOUSE, WILLIAM SMITH THE FATHER OF ENGLISH GEOLOGY, DICTATED THE ORDER OF THE STRATA DECEMBER 11TH 1799
William Smith (1769-1839), also known as "Strata" (layer), was an English geologist known for his study of geological strata (stratigraphy). He prepared the first geological map of Britain and is known as the "father of English geology". (According to the Geological Society, the event indicated on the sign occurred on 11 June, not 11 December, the date given on the sign)