 Leonard Harrison State Park is in the West Branch Susquehanna River drainage basin , the earliest recorded inhabitants of which were the Iroquoian @-@ speaking Susquehannocks . They were a matriarchal society that lived in stockaded villages of large long houses , and " occasionally inhabited " the mountains surrounding the Pine Creek Gorge . Their numbers were greatly reduced by disease and warfare with the Five Nations of the Iroquois , and by 1675 they had died out , moved away , or been assimilated into other tribes . 
