Figure 1

Figure 1.

Visualizations of data in the Sedimentary Geochemistry and Paleoenvironments Project (SGP) database. (A) Relative age uncertainty (i.e., the reported age σ divided by the reported interpreted age) versus Sample ID. The large gap in Sample ID values resulted from the deletion of entries during the initial database compilation and has no impact on analyses. (B) Box plot showing the distributions of relative ages with respect to the sources of data. CMIBS—Critical Metals in Black Shales; NGDB—National Geochemical Database.