wichita.edu
…of science), stratigraphy often uses data that are conceptual and linguistic in nature, rather than numerical and exact. These data usually do not contain information regarding degrees of uncertainty. This is a major drawback: without a way to integrate and understand uncertainty in measurements and results, stratigraphic analyses are incomplete at best…
https://www.wichita.edu/academics/fairmount_las/geology/wparcell/GeoLOGIC/GeoLOGIC.php