Mg/Ca and Sr/Ca ratios of Echinoderm ossicles and plants from Late Pennsylvanian Coal Balls of the Midland (Dalton coal) and Illinois basins (Calhoun Coal), North America

Data Sheet 1. Dalton and Calhoun high-magnesium calcite (HMC) results. Magnesium and calcium contents for echinoderms and coal ball calcite. Seawater Mg/Ca_SW mol/mol calculated using partition coefficient <em>D</em>_<em>C</em>Mg = 0.03757 (Dickson, 2004) and power partition functions Mg/Ca_C = 0.0516Mg/Ca_SW0.668, Mg/Ca_C = 0.0482Mg/Ca_SW0.898 (Ries, 2004). Sr/Ca and Na/Ca ratios reported in mmol/mol. Data Sheet 2. Dalton and Calhoun low-magnesium calcite (LMC) results. Mg and Ca contents for echinoderms and coal ball calcite. Sr/Ca and Na/Ca ratios reported in mmol/mol. Chemical characterization of carbonates by wave-length dispersive (WDS) analyses with a Cameca SX-5, housed in the Texas A&amp;M Materials Characterization Facility (RRID:SCR_022202). Calcium, Magnesium, Strontium, Iron, Sodium, Manganese, Sulfur, Silicon and Aluminum contents of echinoderm ossicles and plant cements analysed.