they both have sediment,they all look like rock layers,the oldest on bottom newest on top,they both have sediment.they all look,the bodem pencil was there longer,the pencels are fasels it soes how old i,they are under rocks like the pens.,the pencils were stacked between,they are both stackt,pens are fossils and the news is rock,a rock is a folil,they are staked up,the oldest ones on bottom and new on top,a fossil on top it newer so its on top,