Concretions, formed by a concentration of minerals in sedimentary rock, often look like fossils too.
(Concretions; formed; by a concentration of minerals in sedimentary rock) (Concretions, formed by a concentration of minerals in sedimentary rock; look too; T:often)
Concretions Concretions, formed by a concentration of minerals in sedimentary rock
formed look too
by a concentration of minerals in sedimentary rock
T:often