ichnology (ik-NOL-uh-jee) noun
A branch of paleontology dealing with the study of fossilized footprints, tracks, traces, etc.
[From ichno- (track or footstep) + -logy (study).]
supplant (suh-PLANT), transitive verb:
1. To take the place of (another), especially through intrigue or underhanded tactics; as, a rival supplants another.
2. To take the place of and serve as a substitute for.
Supplant derives from Latin supplantare, “to put one’s foot under another, to throw down a person by tripping up his heels,” from sub-, “under” + plantare, “to stamp the ground with the foot,” from planta, “the sole of the foot.”