New U-Pb zircon ages of the Sandbian (Upper Ordovician) “Big K-bentonite” in Baltoscandia (Estonia and Sweden) by LA-ICPMS
Bauert, H., Isozaki, Y., Holmer, L., Aoki, K., Sakata, S., Hirata, T.
GFF(Journal of the Geological Society of Sweden)
136
30
33