Welcome to the world of giant Cambrian predators! The anomalocaris is one of the ancient creatures found fossilized in the Burgess Shale in British Columbia, a particularly rich trove of fossils from the Cambrian period (543 to 490 million years ago), in which one finds not only the hard parts of animals, but also the soft, squishy bits. Some of the finds were so weird, that they got names like hallucigenia and odontogriphus ("toothed riddle"). Other sites for finding fossils of equal quality from that era are Chengjiang in China and the House Range in Utah.
posted by Kattullus on Feb 25, 2007 - 18 comments

Orsten or stinkstone (it smells like rotten eggs), is a limestone nodule that has preserved Cambrian fossils extremely well. Scanning Electron Microscopic images of the fossils reveals incredible detail.
posted by obedo on Oct 9, 2005 - 8 comments