By Felix M. Gradstein, James G. Ogg, Alan G. Smith
A successor to A Geologic Time Scale 1989 (Cambridge, 1990), this quantity introduces the speculation and technique at the back of the development of the recent time scale, ahead of proposing the size itself in wide aspect. a global staff of over 40 stratigraphic specialists develops the main updated foreign stratigraphic framework for the Precambrian and Phanerozoic eras. a wide wallchart (not to be had for publication) summarizing the time scale behind the e-book completes this priceless reference for researchers and scholars.
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Additional resources for A Geologic Time Scale 2004
Org). , 1990, p. 2. 21 setting out the stratigraphic principles, terminology, and classiﬁcatory procedures were prepared by the International Commission on Stratigraphic Terminology, created in 1952 by the 19th IGC in Algiers, and now the International Subcommission on Stratigraphic Classiﬁcation (ISSC) under the International Commission of Stratigraphy (ICS) of the International Union of Geological Sciences (IUGS). The International Stratigraphic Guide was published in 1976 (Hedberg, 1976), and is now in its second edition (Salvador, 1994; Murphy and Salvador, 1999).
The statistical method of time scale building employed by GTS82 and reﬁned by GTS89 derived from the marriage of the chronogram concept with the chron concept, both of which represented an original path to a more reproducible and objective scale. Having created a high-temperature radiometric age data set, the chronogram method was applied that minimizes the misﬁt of stratigraphically inconsistent radiometric age dates around trial boundary ages to arrive at an estimated age of stage boundaries.
Primary and secondary markers Principal correlation event (marker) at GSSP level Other primary and secondary markers – biostratigraphy, magnetostratigraphy, chemical stratigraphy, sequence stratigraphy, cycle stratigraphy, other event stratigraphy, marine–land correlation potential Potential age dating from volcanic ashes and/or orbital tuning Demonstration of regional and global correlation 4. Summary of selection process Relation of the GSSP to historical usage; references to historical background and adjacent (stage) units; selected publications Other candidates and reasons for rejection; summary of votes and received comments Other useful reference sections 5.