Stratigraphy and Dating: Excavation Units and Associated Dates

Paquereau-Lebti P. Bulletin of Volcanology , 70 8 , ISSN

Correlation is the alignment of sequences of units or the placement of units with respect to sequences. Synchronic correlation, or cross- dating , involves.

Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. About this PDF file: This new digital representation of the original work has been recomposed from XML files created from the original paper book, not from the original typesetting files.

Page breaks are true to the original; line lengths, word breaks, heading styles, and other typesetting-specific formatting, however, cannot be retained, and some typographic errors may have been accidentally inserted. The amount of deformation can normally be measured with greater accuracy than the age. Adequate age control is thus a limiting factor in studies of active tectonism.

About 26 dating techniques can be applied to dating deposits and deformation of late Cenozoic age past few million years. These techniques can be grouped as numerical, relative dating , and correlation. Numerical techniques are best, but datable materials are often lacking, and in these cases age estimation must be made using relative- dating or correlation techniques.

Relative- dating techniques are nearly always applicable but are not precise and require calibration. Correlation techniques are locally useful and depend on recognition of an event whose age is known, such as a volcanic eruption or a paleomagnetic reversal.