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Also similar to what is found for the Archaic period, Foothill-Mountain sites are characterized by few lithic raw material types; the majority of which derive from local sources (Alan Reed et al. 2008). The highly localized lithic raw material assemblages suggest an insular quality of Foothill/Mountain groups. Paleoindian Architecture Regionally, Paleoindian architecture is known from excavated sites in Wyoming. At three sites, structures were evidenced by holes indicating circular arrangements of poles or hard-packed living surfaces indicating circular lodge structures. Two of the oldest habitations were found in the Hell Gap valley. Dating 9750-9325 BC, they were apparent wickiup-like log structures with diameters of 2-4m (Irwin-Williams 1973). At the same site, but dating slightly later in age (ca. 9550-9000 BC) were three more with similar arcs and circles of post holes in a component with Agate Basin complex affiliation. Evidence of a sixth structure was found at Hell Gap having a Frederick complex affiliation and dating to ca. 7650 BC. With characteristics of the Late Prehistoric period, it consisted of a stone circle roughly 2m in diameter considered to have functioned as weights for holding down the edges of a hide tipi. Similar to floors of these structures, a Folsom complex camp at the Hanson site in northern Wyoming, which dated 9750-9100 BC, yielded three hard-packed living surfaces "believed to represent some sort of circular lodge structures" (Frison and Bradley 1980:9). Frison (1978:115-146) notes that indications from the associated artifacts and the nature of the "lodge" floors were that these were probably utilized for no more than a few days at a time. Similar evidence of structural remains was found at the Agate Basin site in southwest Wyoming. In the Folsom component there, two bison ribs were uncovered in a position suggesting they held down the edge of a lodge covering (Frison 1988:91-92). All these examples are evidence of temporary structures – not unexpected in a nomadic hunting-gathering culture. It is possible that more substantial habitations similar to late Pleistocene Paleoindian pit structures previously found in Russia were constructed in the intermountian region of the Untied States during the cold seasons. Archaic Era Empirical data for plant and animal use during the Late Pleistocene and early Holocene periods are exiguous. However, during this time span the last extinctions of the megafauna were occurring and vegetation communities were radically changing across the North American landscape in response to climatic changes. It marks the beginning of a technological and economical transition from a hunting/mobile subsistence pattern to a hunting-gathering/semi-sedentary one. The primary technological changes were the transition from twined basketry to coiled and the increased use of a variety of grinding tools that were utilized for the processing of roots, tubers and seeds collected from the expanding forests and grasslands. In general, this conversion resulted in a broader diet based on the increased emphasis on lower ranked plants and small animals. Also, evidence of the technological change is seen in the lithic tool kits used to hunt large game animals, as the large fluted and unfluted lanceolate projectile points gave way to smaller types, many of which were notched. 18