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Historic records of arroyo formation have long been used as inferential tools for reconstructing paleoclimate in the American Southwest. Archaeologists use these paleoclimatic reconstructions as convenient boundaries for demarcating long‐term changes in human settlement and subsistence. The rapid accumulation of new data on the hunter‐gatherer/agricultural transition, however, requires the use of higher‐resolution spatial and temporal data from geoarchaeology. High‐resolution documentation of channel exposures helps us interpret this transition along the Santa Cruz River, Tucson, Arizona, at a scale that is more relevant to the archaeological issues of today. © 2000 John Wiley & Sons, Inc.

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stones and bones are the fundamental building blocks of prehistory, especially the deep hominin prehistory. The only thing that survives from the earliest humans, except in rare instances of the humans themselves, is stones and bones in that order. it was in this context that the late archaeologist Glynn isaac (1977) characterized the archaeology of the earliest humans as "squeezing blood from stones." stones and bones must, however, be placed in context, and that largely comes from profiles or rather stratigraphy. stones, bones, and profiles thus constitute the three building blocks of much of the early archaeology from the appearance of earliest humans to the advent of the neolithic or its equivalents on various continents. so it is no wonder that this book, dedicated to two prominent scholars whose careers focused on the earliest americans, the Paleoindians, is about stones, bones, and profiles. in fact, tools and tool making from raw stone material and the remains of food residues, or one of these, are what we find at nearly all Paleoindian sites in western north america. Where we find them and in what contexts are key to understanding the implications of these remains for reconstructing the lifeways of ancient peoples. and by and large, other items are rare or absent, except in a few cases, and often these are likewise made of either stone or bone. We are referring to such things as bone tools (needles, awls, gaming pieces, and others), ornaments (beads), and possibly in a few instances

The St. Louis site, located in the Plains–Parkland transition zone along the South Saskatchewan River, in Saskatchewan, Canada, is a multiple‐component site consisting of stratified floodplain alluvium with multiple, weakly developed soils. Human occupation at the site spans the Late Paleoindian to Middle Precontact periods (10,000–5,000 14C yr B.P.), a time poorly represented archaeologically on the Northern Plains. The dearth of early–middle Holocene‐age archaeological sites is often attributed to reduced inhabitability of the Northern Plains during the Hypsithermal, a period of maximum aridity and limited water availability. Stable isotope and phytolith data from the site indicate increased temperatures during the Hypsithermal and an expansion of Northern Plains grasslands into north‐central Saskatchewan. Although characterized by increased xeric conditions, human occupation at the St. Louis site, as well as the predominance of C3 grasses, attests to the habitability of Northern Plains river systems during this time period. © 2011 Wiley Periodicals, Inc.