Basing his figures on the cooling rate of iron tested at his Laboratory the Petit Fontenet at Montbard, he calculated that the age of the earth was 75,000 years.
Na bazi merenja stopa hlađenja gvožđa testiranih u svom laboratoriji Petit Fontenet u Montbardu, izračunao je da je starost Zemlje od oko 75 000 godina.