Simplify the following text for a Grade 12 native English-speaking person.
Original: The Jurassic Coast consists of Triassic , Jurassic and Cretaceous cliffs , spanning the Mesozoic Era , documenting 180 million years of geological history .
Simplified: The Jurassic Coast is made of Triassic , Jurassic and Cretaceous cliffs , spanning 185 million years of geological history .