9,000 Year Old Obsidian Artifacts Found Under Lake Huron

August 20, 2021

An underwater archaeological team from the University of Texas, the University of Michigan, Lake Superior National Marine Conservation Area, the University of Missouri Research Reactor Center, the Northwest Research Obsidian Studies Laboratory and the University of Georgia have found 9,000 year old obsidian tools under Lake Huron that originated 2,500 miles away from the well-known Wagontire site in Central Oregon. These are the farthest east these western obsidian artifacts has ever been found.
This research was part of a study on caribou hunters at the end of the last Ice Age.

More information: John M. O’Shea et al, Central Oregon obsidian from a submerged early Holocene archaeological site beneath Lake Huron, PLOS ONE(2021). DOI: 10.1371/journal.pone.0250840

Phys.org has the report here:

Radical New Research Challenges Long Held Beliefs on the Cahokia Collapse

June 19, 2021

New research shows that Cahokia was not abandoned because they cut down too many trees. Archaeologists from Washington University in St. Louis looked at the common narrative that the Cahokians deforested the area leading to erosion and flooding. The new team of researchers do not see evidence of flooding at the mound site they re-exacavated. In the journal Geoarchaeology, the researchers described their excavations at an earthen mound in the Cahokia Creek floodplain. The excavations showed that the ground surface of the mound remained stable until modern times. This directly challenges the wood overuse hypothesis.

Tens of thousands of trees were cut down to make palisades, but this did not cause local flooding says the team. Now new research is needed to explain the Cahokia collapse.

Washington University published their report here:

Mike Ruggeri’s Ancient Cahokia