| Biostratigraphy or paleontologic stratigraphy is based on fossil evidence in the rock layers. |
| Two key paleontologic markers of this lineage are pelves compatible with bipedality and braincase size. |
| Finally, their sediments contain enormous quantities of geologic and paleontologic information concerning past environments. |
| According to a paleontologic adage, ontogeny recapitulates phylogeny. |
