“This evidence, combined with the distance to the obsidian’s original source, paint a picture of an extensive trade or exchange network that spanned the continent nearly 3,000 years after the end of the last ice age.”
Looks like more of a painting than a story. So, from a couple of obsidian shards they’re able to conclude that there was trade between Indians leaving in Michigan and those living in California. They probably had a stock market exchange to go with that a well.
The guys that come up with these fantasies could make a much better living if they used their wild and wishful imagination to write novels.
Did you read the rest of it? Or the source links from there? Mineral trace fingerprinting is a very accurate science. They also shared that other Obsidian shards found there were from other closer source locations.