Table 1 Weighted mean 206Pb/238U dates for Siberian Traps LIP rocks.

All dates are corrected for initial Th disequilibrium. Complete analytical details can be found in tables S1 and S2.

Sample no.Location/nameMineralDate (Ma)2σ (x/y/z)*MSWDn
Sill
  A10-23-1Bratsk/PadunskiiZircon251.6810.063/0.091/0.281.28
  A10-23-2Bratsk/PadunskiiZircon251.5390.056/0.086/0.281.211
  A10-23-3Bratsk/PadunskiiZircon251.460.051/0.083/0.28112
  194/35/860Nepa/lower sill/Scholokhovskoie pipeZircon251.3540.088/0.11/0.290.44
  SHl-3085Nepa/Scholokhovskoie pipeZircon251.5010.071/0.097/0.290.3410
  LT10-1-1Lower TungusskayaZircon251.7860.054/0.085/0.280.698
  LT10-2-2Lower TunguskaZircon251.7950.070/0.096/0.291.314
  NT12-5-4Lower TunguskaZircon251.740.18/0.19/0.330.652
  S68-700Bratsk/Oktyabroskoe depositZircon251.5090.044/0.079/0.281.413
  O-6832Bratsk/Oktyabroskoe depositZircon251.5040.059/0.088/0.280.368
  KZ1818-1691Noril’sk/KharaelakhZircon251.710.14/0.16/0.310.133
  KZ1799-1195Noril’sk/TalnakhZircon251.8010.088/0.11/0.290.4510
  R06-05Noril’sk/ChernogorskyZircon251.660.064/0.092/0.280.79
  G22-105-2Noril’sk/Noril’sk 1Zircon251.640.10/0.12/0.300.4811
  G22-63-5Noril’sk/Noril’sk 1Zircon251.9070.067/0.094/0.290.72
  G22-65-0Noril’sk/Noril’sk 1Zircon251.8130.065/0.092/0.2815
  N12-3-2DaldykanskyZircon251.3760.050/0.082/0.281.17
Lava
  K08-14-3Maymecha-KotuyPerov252.200.12/0.16/0.311.115
  K09-6-1Maymecha-KotuyPerov252.270.11/0.15/0.311.112
Welded tuff
  M09-11-1Maymecha-KotuyZircon251.9010.061/0.089/0.281.621
  M09-12-1Maymecha-KotuyZircon251.4830.088/0.11/0.291.17
Pyroclastic breccia
  A10-13-3Angara riverZircon256.560.46/0.51/0.58n/a1
  SG2610.4Noril’skZircon255.580.38/0.43/0.51n/a1
End-Permian mass extinction (4)
  Onset of extinctionMeishan, China Bed 25Zircon251.9410.037/0.281.316
  Cessation of extinctionMeishan, China Bed 28Zircon251.880.031/0.280.7613

*Uncertainties associated with weighted mean 206Pb/238U dates are reported as ±x/y/z, where x are the analytical (internal) uncertainties and y and z include the systematic uncertainties associated with tracer calibration (0.03%) and 238U decay constant (0.05%), respectively. If calculated dates are to be compared with other U-Pb laboratories not using the EARTHTIME tracer, then ±y should be used. If compared to other chronometers such as Ar-Ar or astrochronology, then ±z should be used.