[3][4] The hunter-gatherers of the Archaic period, which lasted locally from 7000 to 1000 BC, used a greater variety of more sophisticated stone artifacts.

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.

[3] Fairmount Township is in the 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 longhouses, but 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.

[4][5] After the demise of the Susquehannocks, the lands of the Susquehanna River valley were under the nominal control of the Iroquois, who also lived in longhouses, primarily in what is now the state of New York.

[4][6] To fill the void left by the demise of the Susquehannocks, the Iroquois encouraged displaced tribes from the east to settle in the Susquehanna watershed, including the Shawnee and Lenape (or Delaware).

[4][5] The French and Indian War (1754–1763) and subsequent colonial expansion encouraged the migration of many Native Americans westward to the Ohio River basin.

[4] On November 5, 1768, the British acquired land, known in Pennsylvania as the New Purchase, from the Iroquois in the Treaty of Fort Stanwix; this included what is now Fairmount Township.

[8] In 1890, a Native American pot, decorated in the style of "the peoples of the Susquehanna region," was found under a rock ledge on Kitchen Creek by Murray Reynolds.

The northern portion of Fairmount Township is mostly made up of mountains, lakes, streams, and thick forests.