By Felix M. Gradstein, James G. Ogg, Alan G. Smith
A successor to A Geologic Time Scale 1989 (Cambridge, 1990), this quantity introduces the idea and method at the back of the development of the hot time scale, prior to featuring the size itself in broad element. a world staff of over 40 stratigraphic specialists develops the main updated overseas stratigraphic framework for the Precambrian and Phanerozoic eras. a wide wallchart (not to be had for publication) summarizing the time scale behind the publication completes this necessary reference for researchers and scholars.
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Additional resources for A Geologic Time Scale 2004
E. its correlation potential – has to be thoroughly tested. In this sense, correlation precedes deﬁnition” (Remane, 2003). Without correlation, stratigraphic units and their constituent boundaries are of not much use, and devoid of meaning for Earth history. Most GSSPs coincide with a single “primary marker,” which is generally a biostratigraphic event, but other stratigraphic events with widespread correlation potential should coincide or bracket the GSSP level. g. Fig. 2). g. ). The requirement for continuous sedimentation across the GSSP level and the bracketing correlation markers is to avoid assigning a boundary to a known “gap” in the geologic record.
For these two eons, the assigned boundary, called a Global Standard Stratigraphic Age (GSSA), is a chronometric boundary and is not represented by a GSSP in rocks, nor can it ever be. However, although there appears to be consensus that the division into eras is possible, the ﬁner period subdivisions often contain no dateable rocks, which make their assignment difﬁcult. An alternative Precambrian classiﬁcation based on stages in planetary evolution with, in most cases, possible associated GSSPs is presented by W.
1985), Berggren et al. (1995a), Gradstein et al. (1995), Roberts et al. (1995a), and Tucker and McKerrow (1995). The International Stratigraphic Chart (Remane, 2000) is an important document for stratigraphic nomenclature (including Precambrian), and included a contrast of age estimates for stratigraphic boundaries modiﬁed from Odin and Odin (1990), Odin (1994), Berggren et al. (1995a), and individual ICS subcommissions. During the 1990s, a series of developments in integrated stratigraphy and isotopic methodology enabled relative and linear geochronology at unprecedented high resolution.
A Geologic Time Scale 2004 by Felix M. Gradstein, James G. Ogg, Alan G. Smith