Prehistoric Animals Break into US Parks Book 2:

When Markie and the team are called to the High Schells Wilderness in Nevada, they think that the situation is going to be easy. But when they get confronted by predatory dinosaurs and get trapped in another time, things change. They now all have to survive and wait until a solution appears. This will be quite an adventure for the watchers and the 5Ds.

-- AJ Griffith