Description:A sedimentary rock formed from calcium carbonate deposited on a shallow, tropical sea-floor. Calcium carbonate is formed as a result of the living processes of plants and animals.
Representing:Paleozoic sedimentary rock of Western Canada Sedimentary Basin, deposited in the Mississippian Period, about 340 million
Original location:Exshaw Quarry, Alberta
Estimated mass (tonnes):8
Donor:Courtesy of Graymont Ltd.