लेखक: Paul S. Martin

Over the past thirty years, late Quaternary environments in the arid interior of western North America have been revealed by a unique source of fossils: well-preserved fragments of plants and animals …

Pollen analysis offers an approach to understanding the Southwestern environment, its history, and in some respects its possible future. Dr. Martin’s study is an example of geochronology functioning …

"What caused the extinction of so many animals at or near the end of the Pleistocene? Was it overkill by human hunters, the result of a major climatic change or was it just a part of some massiv …

The Rio Mayo region of northwestern Mexico is a major geographic area whose natural history remains poorly known to outsiders. Lying in a region where desert and tropical, northern and southern, and …