Ba
Bor
C
CO2
Cu
dam
DSS
E
EGS
EMS
gas
GIS
GSO
H
HDR
Hum
N
O
oil
PAH
Pb
PCS
SEM
U

Chernyk, V. V., Chuvashov, B. I., Davydov, V. I., Schmitz, M., Snyder, W. S.
Usolka section (souther Urals, Russia): a potential candidate for GSSP to define the base of the Gzhelian Stage in the global chronostratigraphic scale
2006. Geologija 49/2, 205-218