Radioisotopic calibration of the Guadalupian (middle Permian) series: Review and updates© 2017 Elsevier B.V. Four high-precision U-Pb CA-IDTIMS dates for the Roadian (lower
Guadalupian Climate and biotic evolution during the Permian-Triassic transition in the temperate Northern Hemisphere, Kuznetsk Basin, Siberia, RussiaDavydov V.I.,
Karasev E.V.,
Nurgalieva N.G.,
Schmitz M.D.,
Budnikov I.V.,
Biakov A.S.,
Kuzina D.M.,
Silantiev V.V.,
Urazaeva M.N.,
Zharinova V.V.,
Zorina S.O.,
Gareev B.,
Vasilenko D.V. to the middle Roadian (early
Guadalupian global glacial event). After that time, the diversity at the species