Crinoid skeletal fragments make up a significant portion of Iowa's limestone deposits. This limestone is used for road base, as agricultural lime, as building stone, and a component of concrete.
bpetrosk@dmreg.com, Des Moines Register: Politics
Fri, 01/19/2018 - 4:08pm
Crinoid skeletal fragments make up a significant portion of Iowa's limestone deposits. This limestone is used for road base, as agricultural lime, as building stone, and a component of concrete.