(from the article `Triassic Period`) ...reliable radiometric data, which are used to establish absolute age. Therefore, the relative ages of Triassic sedimentary rocksderived from the ...
Found on http://www.britannica.com/eb/a-z/b/66
biochronology 1. In geology, the study of the age of the earth based on the relative dating of rocks and geologic events by the use of fossil evidence. 2. The dating of biological events using biostratigraphic or paleontological methods.
Found on http://www.wordinfo.info/words/index/info/view_unit/2819/8
Biochronology is the dating of biological events using biostratigraphic or palaeontological methods. ==Dating systems== A land-mammal age (LMA) is a time interval characterized by distinctive mammal fossil assemblages. The concept was introduced in 1941 by Wood et al to classify the Tertiary period for western North America. By 1983, LVAs were int
Found on http://en.wikipedia.org/wiki/Biochronology
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