- was
traditionally broken into
Early (Tremadocian and Arenig),
Middle (
Llanvirn (subdivided into
Abereiddian and Llandeilian) and Llandeilo) and Late (Caradoc...
- The type
specimen of H. solo was
found in
marine strata of the
Arenig to
Llanvirn-aged
Zitai Formation of
Middle Ordovician southern China and is
named after...
-
evidence of
plant life on land,
dating from the mid-Ordovician (early
Llanvirn, ~470 million
years ago), a
period from
which no
macrofossils have yet...
- longest-lasting
order of strophomenates,
surviving from the
Middle Ordovician (“
Llanvirn”) up
until the Late Permian. Externally, many
orthotetides are difficult...
-
scoltonensis G. clusus, was
found in the
Middle Ordovician of
Canada (
Llanvirn,
Lower Head, Newfoundland) G. cr****us, has been
identified from the Lower...
-
cosmopolitan distribution and
lived from the
Middle to the
Upper Ordovician (
Llanvirn to Ashgill). It has been
found in
Canada (Quebec and Newfoundland), China...
-
Ordovician (Hirnantian)]
Order †Orthotetida [Lower–Middle
Ordovician ("
Llanvirn") –
Upper Permian]
Order †Productida [Upper
Ordovician –
Lower Tri****ic...
- (Lower Ordovician) and
Upper Cambrian strata. The
absence of
Arenig and
Llanvirn (Middle Ordovician)
strata to the east is due to a sub-Caradoc unconformity...
-
rocks are
almost wholly Ordovician in age (Tremadoc
through Arenig to
Llanvirn epochs)
though the
lowermost beds are
possibly of
Cambrian age. This rock...
-
easily correlatable. The
Darriwilian overlaps with the
upper Arenig and the
Llanvirn. The base of the
Darriwilian can be
correlated with a
level in the Fennian...
