The Google Doodle today celebrates Nicolaus Steno (1638–86), one of the founders of modern geology. Steno developed the principle of original horizontality, stating that “rock layers form in the horizontal position, and any deviations from this position are due to the rocks being disturbed later” (from a biography of Steno on the University of California Museum of Paleontology website) and the law of superposition, stating that “layers of rock are arranged in a time sequence, with the oldest on the bottom and the youngest on the top, unless later processes disturb this arrangement.” (Ibid.)
Thanks and kudos to Linda Zellmer, Government Information & Data Services Librarian par excellence, for passing this along!
- “STENSEN, NIELS also known as Nicolaus Steno.” (Complete Dictionary of Scientific Biography. Vol. 13. Detroit: Charles Scribner’s Sons, 2008. p30-35)
- “Nicholas Steno.” UCMP: A History of Evolutionary Thought. (Retrieved January 11, 2012, from http://www.ucmp.berkeley.edu/history/evothought.html )