History, human or geological, represents our hypothesis, couched in terms of past events, devised to explain our present-day observations. — M. King Hubbert Copy Share Image
Historical chronology, human or geological, depends... upon comparable impersonal principles. If one scribes with a stylus on a plate of wet clay two marks, the second crossing the first, another person on examining these marks can tell unambiguously which was… — M. King Hubbert Copy Share Image
