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123 results on '"Rink, W.J."'

6. Dating the geometric Nasca lines in the Peruvian desert

Author

Rink, W.J. and Bartoll, J.

Subjects
Geoglyphs -- Research -- Methods, Geological research -- Methods -- Research, Sediments (Geology) -- Research -- History -- Methods, Anthropology/archeology/folklore, Research, History, Methods
Abstract

The Nasca lines are geoglyphs--arrays of stones forming geometric shapes constructed by ancient humans, the largest ones occupying areas of more than 1 [km.sup.2]. The authors used optically stimulated luminescence dating of quartz buried when the stone lines were constructed to give new dates for contexts associated with geoglyphs on high mesetas near Palpa. They conclude that the stone lines at sites at San Ignacio and Sacramento were constructed between AD 400 and 650. This suggests that they were made in the later part of the Early Intermediate Period by people of the Nasca culture. Keywords: Nasca, geoglyph, optically stimulated luminescence, quartz, Introduction The patterns of stone lines located between Nasca and Palpa, Peru (Figure 1) form geometric and biomorphic geoglyphs spread over an area of several hundred square kilometres of desert [...]

Published
2005

8. Latest Homo erectus of Java: potential contemporaneity with Homo sapiens in Southeast Asia

Author

Swisher, III, C.C., Rink, W.J., Anton, S.C., Schwarcz, H.P., Curtis, G.H., and Suprijo, A.

Subjects
Pithecanthropus erectus -- Research, Antiquities -- Research, Prehistoric peoples -- Research, Excavations (Archaeology) -- Indonesia, Java (Computer program language) -- Research, Science and technology, Java, Research
Abstract

Hominid fossils from Ngandong and Sambungmacan, Central Java, are considered the most morphologically advanced representatives of Homo erectus. Electron spin resonance (ESR) and mass spectrometric U-series dating of fossil bovid teeth collected from the hominid-bearing levels at these sites gave mean ages of 27 ± 2 to 53.3 ± 4 thousand years ago; the range in ages reflects uncertainties in uranium migration histories. These ages are 20,000 to 400,000 years younger than previous age estimates for these hominids and indicate that H. erectus may have survived on Java at least 250,000 years longer than on the Asian mainland, and perhaps 1 million years longer than in Africa. The new ages raise the possibility that H. erectus overlapped in time with anatomically modern humans (H. sapiens) in Southeast Asia., The geologic age and taxonomic affinity of hominid fossils from Ngandong and Sambungmacan, Central Java, bear directly on the controversy surrounding the origin of anatomically modern humans (H. sapiens). Proponents [...]

Published
1996

25. Alpine terranes (K-Ar/Ar-Ar )

Author

Wijbrans, J.R., Rink, W.J., Thompson, J.W., Rink, W.J., Thompson, J.W., and Geology and Geochemistry

Subjects
Geology
Published
2013

30. Natural accumulation of Schottky-Frenkel defects: implications for a quartz geochronometer

Author

Odom, A.L. and Rink, W.J.

Subjects
Quartz -- Inclusions, Geological time -- Research, Electron paramagnetic resonance spectroscopy -- Research, Earth sciences
Abstract

Electron spin resonance (ESR) analyses have been made of natural quartz samples ranging in age from 100 ka to 1.4 Ga. Signal intensities of two ESR centers that can be associated with Schottky-Frenkel (SF) defects are significant correlated with age. These defects are thought to accumulate naturally as a result of elastic collisions in the quartz lattice initiated by the recoil of alpha-emitting nuclides present as impurities. Preliminary indications are that recoil-induced SF defects can be significantly more abundant than original SF defects in samples older than several million years. These considerations provide the theoretical basis for a long-ranging quartz geochronometer.

Published
1989

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