D. G. Smith, M. D. Fewtrell; A use of network diagrams in depicting stratigraphic time-correlation. Journal of the Geological Society ; 136 (1): 21–28. doi: https://doi.org/10.1144/gsjgs.136.1.0021
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Time-correlation among palaeontological samples or other items of geological information located in measured sections can be depicted graphically as a network, in which the samples, represented by points, are linked by arrows, each of which represents a decision as to which of the samples linked is the older and which the younger. The idea of a correlation network stems naturally from the concept of correlation as a process of ordering, not equating, items of geological information in time. Examples of correlation networks are presented for a palynological reconnaissance of Triassic-Jurassic sections in eastern Svalbard, and for correlation of Lower Carboniferous sections in North Yorkshire based on calcareous microfossils.