set deep into a narrow trench. The walls and posts are covered with wattle and daub (a loose weaving of sticks covered with a mud-and-grass plaster). Defensive bastions along the stockade walls were also reconstructed. The original inhabitants set the bastions about apart and projecting to from the wall. The distance between each bastion allowed defenders using arrows or lances to protect the walls from direct attack. Other structural features When residences were no longer "serviceable," the Mississippians burned the structures and constructed a new one over the ashes. Indiana archaeologist Glenn A. Black posited that walls were covered in cane and plastered with mud and straw. Roof composition is uncertain, but Black thought they were grass thatch. Two construction methods were used, one for summer and another for winter. Two circular structures uncovered at the site are likely to have been sweat lodges (similar in use to present-day saunas). Or, they may have been used for meetings. The Mississippians also constructed what is believed to have been a public plaza between Mound A and Mound F. Artifacts About 2.4 million artifacts were collected during excavations conducted by WPA workers from 1939 to 1942. One of the most significant artifacts uncovered at the Angel site was a carved Mississippian culture stone statue of a seated man, which was found at Mound F in November 1940. The fluorite artifact is tall and weighs . Similar rare fluorite statues have been found at the Obion Mounds site in Henry County, Tennessee and the Ware Mounds site in Union County, Illinois. Mississippian tools and weapons found at the site were made of igneous rock, sedimentary rock (sandstone), slate, shale, diorite, or cannel coal. Metalwork objects were very rare. Based on research and artifacts discovered at the Angel site, it is believed that the Mississippians used bone fishhooks and nets made of cord to catch mollusks and freshwater fish (catfish and drumfish). Spears with projectile points were used to hunt small game. Antler, animal and bird bone, shells, and animal teeth were also found. Of the nearly 2 million sherds of pottery found at the site, 4,569 of them were of the negative-painted type. Textile patterns made inside of the pottery are a trait unique to the Angel site. In May 2006, researchers discovered a probable pottery-making workshop at the site. This discovery further revealed the artistic skills of the Mississippian culture people. Pottery