Supplemental Material: Precursors to a continental-arc ignimbrite flare-up: Early central volcanoes of the San Juan Mountains, Colorado, USA

Table S1: Summary of ⁴⁰Ar/³⁹Ar and U-Pb zircon age determinations, pre-ignimbrite volcanoes of the eastern San Juan region. Table S2: New and published X-ray fluorescence (XRF) rock analyses, pre-ignimbrite volcanoes of the San Juan region. Table S3 and figures: Analytical data—new ⁴⁰Ar/³⁹Ar age determinations. Table S4: Analytical data—new U-Pb zircon age determinations. Table S5: Multimineral age comparisons—single samples and multiple samples from the same locality. Table S6: Groundmass-mineral age comparisons.