The archaeological record of the first Americans in Mexico is poorly known and somewhat confusing. However, the state of Sonora presents a remarkably pristine setting for studying the late Pleistocene occupation of North America. The early archaeological record in Sonora is stunning in terms of its relative abundance and only within the past ten years has this fact become evident. The Paleo-Indian sites are concentrated in north-central Sonora on and surrounding, the Llanos de Hermosillo. The settlement pattern appears to indicate that Clovis groups were generalized hunter and gatherers that exploited a wide range of environments, and their diet was based upon a wide variety of foodstuffs. The Clovis groups of Sonora developed a sophisticated settlement pattern and land use determined by the location of lithic sources for tool making, water sources, large prey animals and a mosaic of edible plants and small animals. Exploiting an extensive territory probably permitted them to remain in the same region for longer periods of time. The presence of only few late Paleo-Indian diagnostic points could represent the decrease of population density in Sonora, but most likely it is an indication that after Clovis a regionalization of the hunter and gather groups took place in Sonora. The Sonoran Clovis occupation is a testimony that multiple regional Clovis adaptations emerged each with specific responses of plants, animals and resources.

The Chipola River Valley in northwest Florida is an area of extensive occupation by pre-contact peoples, dating as far back as the Paleo-Indian time period (approximately 11,000 BC). With such a rich archaeological history, it has enticed many local divers to explore river bottoms and collect artifacts. I worked with one local collector to study over 700 projectile points found in the Chipola River. The collector has taken great care to protect and preserve these points and, in many cases, documented the GPS coordinates from where they were collected. Using the GPS coordinates and ArcMap, I have been able to compare where these artifacts were collected to the locations of known archaeological sites which had been previously documented along the Chipola. With this new data set, I used landscape theory to compare prehistoric settlement patterns in the Southeast to the patterns derived from this collection. Overall, this project has documented 80 new sites within the region, filling in areas of the river which previously had no known prehistoric sites. The work also added information for 19 previously-known sites, extending the occupations of some to either later or earlier time periods. Finally, this work can be used to evaluate various models of the early human settlement in the region, specifically the Oasis Model. I hope the success of this project encourages other archaeologists to work with knowledgeable collectors and avocationals to learn more about the archaeological history of different regions.