Local rock specimens show evidence of plate tectonic movements that created the Pangea supercontinent and later broke it apart. Igneous, sedimentary, and metamorphic rocks represented here record these dramatic Earth events. Metamorphic rocks, like quartzite, formed from intense heat and pressure as tectonic plates collided. Granite, an igneous rock, was created from magma chambers that cooled within ancient volcanoes. During Pangea’s split 200 million years ago lava flowed out of a rift-faulted valley and cooled to form igneous basalt. Dinosaurs roamed over sandy deposits, leaving tracks later preserved in sedimentary rock. Franklin County is a great place to study geology.