ORDOVICIAN (STRATIGRAPHY)
-
BTPALAEOZOIC (STRATIGRAPHY)
-
UDC551.732
-
Descriptor GERORDOVICIUM (STRATIGRAPHIE)
-
Descriptor ENGORDOVICIAN (STRATIGRAPHY)
-
Descriptor FREORDOVICIEN (STRATIGRAPHIE)
-
NTHERCYNIAN + ARMORICAN + VARISCAN OROGENY (STRATIGRAPHY)
-
NTCALEDONIAN OROGENY (STRATIGRAPHY)
-
NTMIDDLE ORDOVICIAN (STRATIGRAPHY)
-
NTUPPER ORDOVICIAN (STRATIGRAPHY)
-
NTLOWER ORDOVICIAN (STRATIGRAPHY)