BROOKVILLE, Ind. -- It's being called one of the biggest infrastructure improvements for the nation in 25 years but as the 1,700 mile Rocky Mountain Natural Gas pipeline winds into the Tri-State, it's making history in a way no one expected.

Archaeologists said that what excavators found near Brookville, Ind., is so significant that it could help rewrite history books.

The workers uncovered what seems to be evidence of an unknown previous settlement that dates back thousands of years.

Some of the evidence that have been uncovered so far dated back 600, 1,000 and even 5,000 years old, archaeologists said.

"And the exciting part of that is, we don't have any of these structures recorded in the Whitewater Valley," senior investigator Don Cochran said.

Diggers have found pottery, arrow points and even jewelry that are older than the structures they were discovered in.

The big find might have stay buried if not for the major natural gas pipeline that will run from Colorado to Ohio. And it was all constructed to make some economic history for local homeowners.

"Rocky Mountain gas is cheaper and bringing that gas to Indiana and Ohio, we hope is going to have a positive impact on the market," Rocky’s Express Pipeline worker Allen Fore said.

The scientists have removed most of what they can but they said it will take about a year of study to finish the report that will tell them what they found.