Tobias-Thompson Complex, also known as Little River Archeological District (14RC2,3,8,9,12,13,14,40, was designated a National Historic Landmark in 1964 and listed on the National Register of Historic Places in 1966.Its 1964 statement of significance read:The complex is composed of a cluster of eight village sites along the Little Arkansas River, all of which relate to the Little River Focus of the Great Bend Aspect dating from 1500-1700 AD.