Donnelly, Ignatius 1831-1901 creator text utu 2004 monographic en 1 online resource : multiple file formats "Ragnarok: The Age of Fire and Gravel" by Ignatius Donnelly is a book published in 1883. Donnelly proposes that a massive comet struck Earth 12,000 years ago, destroying an advanced civilization and plunging survivors into a dark age. He supports his theory with geological evidence from the Great Lakes, chemically altered rocks, and ancient myths from cultures worldwide describing cosmic catastrophe, fire, floods, and prolonged darkness. (This is an automatically generated summary.) Wikipedia page about this book: https://en.wikipedia.org/wiki/Ragnarok:_The_Age_of_Fire_and_Gravel Release date is 2004-02-01 J.B. Hare Original publication data not identified Atlantis (Legendary place) Drift Comets GN Original publication data not identified https://www.gutenberg.org/ebooks/5109 https://www.gutenberg.org/ebooks/5109 UtSlPG 260607 20260610133134.0 5109