South Dakota Home To A Rich Variety Of Fossils
by Associated Press
September 08, 2013 11:15 AM
Besides its major tourist attractions, South Dakota is also known for its rich variety of fossils.
Even Lewis and Clark documented a creature they found on Sept. 10, 1804, along the Missouri River in what is now most likely Gregory County.
They noted the discovery of what they thought was the backbone of a fish that was 45 feet long.
Many scientists believe it was probably not a fish but an ancient sea-going reptile called a mosasaur.
Science will never know for sure because the fossilized bones the explorers sent back to Washington are now lost.