Archaeologists using ground-penetrating radar may have found the ruins of a grain mill owned by Revolutionary War figure George Rogers Clark on a bluff overlooking the Ohio River city named after him.

November's discovery left the team of researchers excited, said Cheryl Munson, an Indiana University archaeologist overseeing the high-tech imaging and excavations in a 280-acre historic district along Clarksville's riverfront.

She said the team picked up reflections from ground-penetrating radar that indicated a manmade foundation composed of stone or brick lies beneath the site.

The find was made along Mill Creek not far from the Ohio River in an area "that looks most promising" as the likely location of the mill that was a cornerstone of Clark's original settlement just across the river from Louisville, Ky.

The radar imagery supports earlier findings of two sprawling American Indian villages -- one dating to around 1200 A.D. and another to about 300 A.D. Excavations earlier in 2009 found Indian artifacts in that site.

Research at the site will resume when the ground warms up enough, perhaps in March, to take samples of the soil in the area and do small core drills, Munson said.