References for the age of the Earth

• Thomson (aka Lord Kelvin), 1862, Sun's age 100-500 Myr, based on rate of cooling
• Thomson (aka Lord Kelvin), 1863, Earth's age 20-400 Myr, based on rate of cooling
• Thomson (aka Lord Kelvin), 1897, Earth's age 24 Myr, based on rate of cooling
• Joly, 1899, Earth's oceans 80-100 Myr, based on sodium content and rate of leaching

• Darwin, 1859, Earth's age at least 300 Myr, based on erosion and sedimentation of English Weald
• Reade, 1878, Earth's age at least 526 Myr, based on erosion and sedimentation

• Boltwood, 1907, Earth's age 410-2200 Myr, based on radioactive dating of isotopes (?). See American Journal of Science, 23, p. 77.
• Arthur Holmes, 1913, see "The Age of the Earth"
• Joseph Barrell, 1917, Cambrian age 550-700 Myr, based on radioactive dating. See Bulletin of Geological Society of America, 28, p. 745.
• Holmes, 1931, Earth's age 1460-3000 Myr, based on radioactive dating. Possibly see Journal of Washington Academy of Sciences, 23, p. 169.