The Door Peninsula is a peninsula in eastern Wisconsin, separating the southern part of the Green Bay from Lake Michigan. The peninsula includes northern Kewaunee County, northeastern Brown County, and the mainland portion of Door County. It is on the western side of the Niagara Escarpment. Well known for its cherry and apple orchards, the Door Peninsula is a popular tourism destination. With the 1881 completion of the Sturgeon Bay Ship Canal, the northern half of the peninsula became an island. Limestone outcroppings of the Niagara Escarpment are visible on both shores of the peninsula, but are larger and more prominent on the Green Bay side as seen at the Bayshore Blufflands. Progressions of dunes have created much of the rest of the shoreline, especially on the east side. Flora along the shore demonstrate plant succession during periods of low lake levels. The middle of the peninsula is mostly flat. Beyond the peninsula's northern tip is a series of islands, the largest of which is Washington Island. The partially submerged ridge extends farther north, becoming the Garden Peninsula in Michigan's Upper Peninsula. History Archaeology Paleo-Indian artifacts have been found at two sites in the town of Union and two sites in the city of Sturgeon Bay. The Cardy and Salisbury Steak sites are located about a mile from each other in the south side of the city, and the Heyrman I and Boss Tavern (or Fabry Creek) sites are a quarter-mile from each other along Highway 57 in the town of Union. It is thought that the Boss Tavern site was used as a base camp, while the Heyrman I site was used as a workshop area for producing stone tools and possibly also as a very brief campsite. Both sites were occupied multiple times by Paleo-Indians. A microwear analysis of the scraping tools found at the Boss Tavern site found that the tools had been used for butchering, skinning, and working with dry hides, and for scraping and smoothing wood. One scraping tool resembled an adze and was used to support the hypothesis that Paleo-Indians built watercraft. A layer of sand was found at the Boss Tavern site, indicating it was a beach when lake levels were higher than they are today. The tools and waste chips at the Heyrman I site suggest that the Paleo-Indians there may have been less mobile than those who resided at the Boss