A brief analysis on the process and Penalty selection forconstructing the composite stratigraphic section using CONOP: a quantitative study on Late Devonian ammonites
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Abstract:
Along with the research development on quantitative stratigraphy and paleontology, Constrained Optimization (CONOP) has played an important role in the quantitative analysis of paleontological taxa diversity changes and stratigraphic correlations. This paper briefly introduces the principles and algorithms of CONOP and the process of stratigraphic correlation analysis based on CONOP, which includes selection, standardization and input of stratigraphic data, constructing a composite section, and finally achieving the diversity curve. Using the Famennian ammonites as an example, we analyzed the influence of different Penalty selection (Penalty = “Interval” and Penalty = “Level”) on the event sequence and diversity level of fossils in the composite section. The results indicate that there is no significant difference on the event sequence and diversity of the composite section when the selected sections have very few conflicts on the event sequence the deposition of the sections is relatively thick and even, and the fossils are sufficiently sampled. If the sequence of events varies remarkably among different sections and the deposition of the sections is relatively thick and even, the Interval measurement method is recommended, because it is optimized according to the section thickness. If the sections have good fossil records and have been sufficiently sampled, the Level measurement method is recommended to avoid the bias caused by different deposition rates, as it is optimized based on the number of events.
