Correlating Shale and Limestone Layers Containing the Same Trilobite Fossils,Two layers of rock contain fossils of the same kinds of trilobites; however, one rock layer is a shale and the other is a limestone. Can these two layers be used for correlation?

Correlating Shale and Limestone Layers Containing the Same Trilobite Fossils

Correlation is a fundamental tool used in geology to determine the age of rocks and to understand the stratigraphic relationships between two or more rock layers. Correlation is achieved by comparing the fossils found in each layer and attempting to identify similarities between them. In this case, two separate rock layers, a shale and a limestone, have been found to contain fossils of the same types of trilobites. Can these two rock layers be used for correlation? The answer is yes, but with a few caveats. The most important of these is that the rock layers must be contemporaneous (Lüning, 2019). In other words, they must have been laid down at the same time in the same environment. If this is the case, then the two rock layers can be used to gain an understanding of the age and stratigraphic relationship of the two layers. Additionally, the fossils must be of the same species, as variation between species of trilobites can indicate different environments or ages (Chen et al., 2015). In conclusion, shale and limestone layers containing the same trilobite fossils can be used for correlation… Cont…

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