Maximum Likelihood, Lognormality and Compound Distributions - Geomathematics: Theoretical Foundations, Applications and Future Developments - page 87

Fig. 3.7 Ages of Mesozoic stage boundaries estimated by maximum likelihood (Modi￿ed from
Gradstein et al. 1995 , Fig 6)
3.1.6 Mesozoic Timescale Example
The maximum likelihood method ( L method) was used repeatedly for stage boundary
age estimation during the 1990s ( cf .Agterberg 1994 ). An example is shown in Fig. 3.7 .
Estimates obtaining by using the scoring method were re￿ned by splining, a method to
be discussed in Chap. 9 . Details of how theMesozoic time was computed can be found
in Gradstein et al. ( 1994 , 1995 ). A general disadvantage of the chronogram and