A lil over 3" in width and 4" height , very fragile with thin shell like layers found in AZ buried deep within the earths dirt. Please help me out by giving me some information or something to help me identify this. Thx for taking time to help me its appreciated!!!DGKallday71378
[h=1]Concretions[/h] [FONT=Arial, Helvetica, sans-serif]Concretions are commonly misunderstood geologic structures. Often mistaken for fossil eggs, turtle shells, or bones, they are actually not fossils at all but a very common geologic phenomenon in all types of sedimentary rock; including sandstone which is made up of compacted sand grains, shale which is made up of compacted mud, siltstone which is made up of a fine grained silt, and limestone which is made up of calcium carbonate precipitated by many marine invertebrates.[/FONT]