What could account for chronologically older artifacts being found above younger artifacts in a stratigraphic sequence?

- Faunalturbation

- Cultural disturbance

- Graviturbation

Explanation:

Things that could account for these chronologically older artifacts that are found above the younger artifacts in a stratigraphic sequence include;

- Faunalturbation which is caused by animals involved in burrowing

- Cultural disturbance

- Graviturbation which is the mixing of soil by movement of artifacts down a slope under gravity.

answer; in the united states the plains include the great plains of the west and the tail grass prairie to the south of the great lakes extending east to the appalachian plateau