JM Adams, H Faure, L Faure-Denard, JM McGlade… - Nature, 1990 - nature.com
EVIDENCE from ice cores1 indicates that concentrations of atmospheric carbon dioxide were lower by about 75 ppm during the Last Glacial Maximum (LGM;∼ 18,000 years ago) …
Well-developed desert pavements are present above eolian deposits that mantle flows of the Cima volcanic field, located in the Mojave Desert, California. Soil-stratigraphic data and …
With the growing recognition during the last two centuries that the Earth has an immense age and processes over long periods of time have changed the morphology and …
Dating the Quaternary, which covers approximately the last 2 million years, has experienced considerable progress over the past few decades. On the one hand, this resulted from the …
PR Christensen, ST Harrison - Journal of Geophysical …, 1993 - Wiley Online Library
Thermal infrared Spectroscopy has become an increasingly important tool for remote compositional analysis and geologic mapping. Most published laboratory measurements …
The peopling of the Americas is both the oldest and most frequently researched question in American archaeology. Although rarely considered, early art has the potential to provide …
DATING of prehistoric rock paintings (pictographs) has traditionally relied on indirect evidence. This includes inferences based on the archaeological context, such as …
Since World War II, there has been tremendous success in the development of new methods for dating artifacts; the so-calledradiocarbon revolution'was only the first such discovery. The …
FM Phillips, MG Zreda, SS Smith, D Elmore… - … et Cosmochimica Acta, 1991 - Elsevier
Using cosmogenic 36 Cl buildup and rock varnish radiocarbon, we have measured the exposure age of rock surfaces at Meteor Crater, Arizona. Our 36 Cl measurements on four …