Sharks’ Teeth
Steven Mithen: How old is the Earth?, 30 July 2015
Earth’s Deep History: How It Was Discovered and Why It Matters
by Martin Rudwick.
Chicago, 360 pp., £21, October 2014,978 0 226 20393 5 Show More
by Martin Rudwick.
Chicago, 360 pp., £21, October 2014,
“... made early use of microscopy to identify cells in what could thereby be identified as fossilised wood, and Nicolas Steno dissected a shark’s head to demonstrate that the well known fossils called glossopetrae, ‘tongue-stones’, found embedded in rocks on land, had once been sharks’ teeth, and must have come from sharks much larger than any currently ... ”