Dating back to the 18th century have been known as geologic curiosity’s due to the various sizes, shapes and compositions. have also been thought to be dinosaur eggs, extra-terrestrial debris, human artifacts and animal and plant fossils. Due to these curiosity’s I will try and enlighten you more on these in the following by explaining the process in which they are formed and explaining some locations where they can be found in large outcrops. “The word "concretion" is derived from the Latin "con"-- meaning "together" -- and "cresco" ....