appeared around 1500 BC. These people gathered copper ore at quarries on the Keweenaw Peninsula in Michigan and on Isle Royale in Lake Superior. They may have crafted copper artifacts by hammering and folding the metal and also by heating it to increase its malleability. However it is not certain if these people reached the level of copper smelting. Regardless, the Copper Culture of the Great Lakes region reached a level of sophistication unprecedented in North America. The Late Archaic Period also saw the emergence of cemeteries and ritual burials, such as the one in Oconto. The Early Woodland Period began in 1000 BC as plants became an increasingly important part of the people's diet. Small scale agriculture and pottery arrived in southern Wisconsin at this time. The primary crops were maize, beans and squash. Agriculture, however, could not sufficiently support these people, who also had to hunt and gather. Agriculture at this time was more akin to gardening than to farming. Villages emerged along rivers, streams and lakes, and the earliest earthen burial mounds were constructed. The Havana Hopewell culture arrived in Wisconsin in the Middle Woodland Period, settling along the Mississippi River. The Hopewell people connected Wisconsin to their trade practices, which stretched from Ohio to Yellowstone and from Wisconsin to the Gulf of Mexico. They constructed elaborate mounds, made elaborately decorated pottery and brought a wide range of traded minerals to the area. The Hopewell people may have influenced the other inhabitants of Wisconsin, rather than displacing them. The Late Woodland Period began in about 400 AD, following the disappearance of the Hopewell culture from the area. The people of Wisconsin first used the bow and arrow in the final centuries of the Woodland Period, and agriculture continued to be practiced in the southern part of the state. The effigy mound culture dominated Southern Wisconsin during this time, building earthen mounds in the shapes of animals. Unlike earlier mounds, many of these were not used for burials. Examples of effigy mounds still exist at High Cliff State Park and at Lizard Mound County Park. In northern Wisconsin people continued to survive on hunting and gathering, and constructed conical mounds. People of the Mississippian culture expanded into Wisconsin around 1050 AD and established a settlement at Aztalan along the Crawfish River. While begun by the Caddoan people, other cultures began to borrow & adapt the Mississippian cultural structure.