CHICAGO — Governor JB Pritzker joined legislators, students, and teachers at the Morton Arboretum to designate Dolostone as the official rock of the State of Illinois. The initiative began by a group of elementary school students from Pleasantdale Middle School in Burr Ridge and Maplebrook Elementary School in Naperville. After the students discovered that Illinois did not have a state rock, they created a ballot and had students across the state vote for a winner. The chosen rock was Dolostone. Dolostone, a form of limestone, forms the majority of Illinois’s bedrock, establishing a foundation for the state’s other natural terrain. Its name comes from its original discovery in the Dolomite Alps.
