At least, not one involving the Maiasaurs. Sorry, but there's no stable time loop here. Like modern predators, they'd cut one animal out of the herd and take it down. Besides, a Troodon pack wouldn't be able to take out a whole herd. So it was probably a landslide or volcanic lahar that drove the Maiasaurs away from their nests when they were killed. Fossils can only form if an organism is buried before it has a chance to rot completely. Bear in mind, this episode is working off of the false assumption that fossilization can happen to a bone left to rot.This causes their fossils to end up far away from their nests, leading to the paleontologists' original conundrum. The Maiasauras are driven away from their nests and are ultimately eaten by the Troodons. The class goes back in time to find the nests, inadvertently leading a Troodon pack to the nesting grounds. The book The Magic School Bus In the Time of the Dinosaurs features a Stable Time Loop.The paleontologists discover Maiasaura bones but can't find their nests.
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