Simple:
* The excavation revealed ancient Roman ruins.
Descriptive:
* The excavation of the burial mound was a painstaking process, uncovering artifacts dating back centuries.
Figurative:
* His mind was a excavation of memories, both joyful and painful.
In a context:
* The archaeologists conducted a excavation at the site for three months, searching for evidence of prehistoric settlements.
You can also use "excavation" as a verb, like this:
* They excavated the site for weeks before finding anything of interest.