Saltzman, Matthew R. Supplemental material:  Sea Level-Driven Changes in Ocean Chemistry at an Upper Cambrian Extinction Horizon GSA Data Repository Item 9546, Geology, Vol. 23, p. 893. File size: 4 p., about 90 K bytes. Geoscience 1995-01-01
    https://gsapubs.figshare.com/articles/journal_contribution/Supplemental_material_Sea_Level-Driven_Changes_in_Ocean_Chemistry_at_an_Upper_Cambrian_Extinction_Horizon/12335693
10.1130/9546