The second timeline opened up by Eric Flint was the one based around the novel '' Time Spike '' , which he co-wrote with Marilyn Kosmatka . It was published in May 2008 . This timeline involves several different periods in the history of Middle America , starting with a maximum security prison in the 2000s , along with Amerinds on the Trail of Tears , Spanish Conquistadors , a city of the Mound Builders , and some Paleoindians — all displaced into the age of dinosaurs ( several different periods of the age are also jumbled together )
Trail of Tears
Trail of Tears
Assiti Shards series