When Helen Cutter started her mission to stop Humanity from evolving, she opened this Anomaly using an Anomaly Opening Device and went through into the Cretaceous. She then closed the Anomaly behind her to stop the ARC team from following her through.
Connor Temple later managed to reopen the Anomaly using another Opening Device, and escaped through with Abby Maitland and Danny Quinn from a pack of Future Predators. Connor then closed the Anomaly again to stop the Predators from following the team through.
One year after their Opening Device died, Connor was still hopeful that this Anomaly would reopen but it didn't.