The following article contains an answer for the question: What is the name of the treaty that established a Purchase line which was disputed? , can you please find it? 

Humans have lived in what is now Pennsylvania since at least 10,000 BC. The first settlers were Paleo-Indian nomadic hunters known from their stone tools. The hunter-gatherers of the Archaic period, which lasted locally from 7000 to 1000 BC, used a greater variety of more sophisticated stone artifacts. The Woodland period marked the gradual transition to semi-permanent villages and horticulture, between 1000 BC and 1500 AD. Archeological evidence found in the state from this time includes a range of pottery types and styles, burial mounds, pipes, bows and arrows, and ornaments.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.After this, the lands of the West Branch Susquehanna River valley were under the nominal control of the Iroquois. The Iroquois lived in long houses, primarily in what is now New York, and had a strong confederacy which gave them power beyond their numbers. They and other tribes used the Pine Creek Path through the gorge, traveling between a path on the Genesee River in modern New York in the north, and the Great Shamokin Path along the West Branch Susquehanna River in the south. The Seneca tribe of the Iroquois believed that Pine Creek Gorge was sacred land and never established a permanent settlement there. They used the path through the gorge and had seasonal hunting camps along it, including one just north of the park near what is now the village of Ansonia. To fill the void left by the demise of the Susquehannocks, the Iroquois encouraged displaced tribes from the east to settle in the West Branch watershed, including the Shawnee...

Treaty of Fort Stanwix