MIDDLEBOROUGH — A developer has notified the Massachusetts Historical Commission that he intends to proceed with his long-held plan to build a subdivision on land in Middleborough that some believe was the site of an ancient Native American village.

The decision by Elliot R. Schneider, principal of Sharon-based AGS Development, has stirred concerns among some town officials and others trying to save the property from development because of mounting evidence that it includes a valuable archeological site. The local Planning Board had permitted Schneider’s proposal to build nine houses on the land in 2005, but the project was put on hold while archeologists survey the parcel and prepare a report for the state commission.