Millions of years ago, the prehistoric ancestors of today's trucks, such as garbageadon, dozeratops, and craneosaurus, roamed the Earth until they rusted out and became extinct. Interest Level: K-3 Reading Level: 1.7 ATOS Book Level: 1.7 AR Interest Level: LG AR Points: .5 AR Quiz: 130956EN Lexile Measure: 310 Lexile Code: AD (Adult Directed) Fountas & Pinnell: M.