The 1785 Land Ordinance organized a system of surveying land in regular square six-mile units called townships and square one-mile subunits called sections. Surveyor General Edward Tiffin set the Michigan Meridian (north-south line) using the 1807 Treaty of Detroit land cessions. On September 29, 1815, Benjamin Hough began the surveying north from Defiance, Ohio. Alexander Holmes began surveying the meridian from a point 78 miles west of Detroit. Wet land caused him to turn east then north before starting the base line east. He quit that fall, but Hough completed the meridian and marked the initial point in 1816. Tiffin suspended surveying in 1816 as he believed the land "poor" Unfit for military purposes and not "worth the expense of surveying it."