Classicly

Ragnarok: The Age of Fire and Gravel is a book by Minnesota politician Ignatius L. Donnelly published first in 1883. It is a companion to the more well-known work Atlantis: The Antediluvian World.

Ignatius Loyola Donnelly was an American Congressman, populist writer, and amateur scientist. He is known primarily now for his fringe theories concerning Atlantis, Catastrophism, and Shakespearean authorship, which many modern historians consider to be pseudoscience and pseudohistory.