Supplemental material: Organic-Matter Source Variation and the Expression of a Late Middle Ordovician Carbon Isotope Excursion Richard D. Pancost 10.1130/9987 https://gsapubs.figshare.com/articles/journal_contribution/Supplemental_material_Organic-Matter_Source_Variation_and_the_Expression_of_a_Late_Middle_Ordovician_Carbon_Isotope_Excursion/12336443 GSA Data Repository Item 9987, Geology, Vol. 27, p. 1015. File size: 1 p., about 20 K bytes. 1999-01-01 00:00:00 Geoscience