Concretions are formed by the precipitation of minerals around a central nucleus and are often round or ovoid in shape. Concretions are commonly found in sedimentary rocks and soils.
James St. John, via Wikimedia Commons
Penn Dixie Fossil Park & Nature Reserve
Unearth the Unexpected!
Concretions are formed by the precipitation of minerals around a central nucleus and are often round or ovoid in shape. Concretions are commonly found in sedimentary rocks and soils.
James St. John, via Wikimedia Commons