The successive mound building Troyville, Coles Creek, and Plaquemine cultures occupied western Mississippi bordering the Mississippi River during the Late Woodland period. During the Terminal Coles Creek period (1150 to 1250 CE) contact increased with Mississippian cultures centered upriver near St. Louis, Missouri. This led to the adaption of new pottery techniques, as well as new ceremonial objects and possibly new forms of social structuring. As more Mississippian culture influences were absorbed the Plaquemine area as a distinct culture began to shrink after 1350 CE. Eventually the last enclave of purely Plaquemine culture was the Natchez Bluffs area, while the Yazoo Basin and adjacent areas of Louisiana became a hybrid Plaquemine-Mississippian culture. Historic groups in the area during first European contact bear out this division. In the Natchez Bluffs, the Taensa and Natchez had held out against Mississippian influence and continued to use the same sites as their ancestors and carry on the Plaquemine culture. Groups who appear to have absorbed more Mississippian influence were identified at the time of European contact as those tribes speaking the Tunican, Chitimachan, and Muskogean languages.