- The
Ordovician (/ɔːrdəˈvɪʃi.ən, -doʊ-, -ˈvɪʃən/ or-də-VISH-ee-ən, -doh-, -VISH-ən) is a
geologic period and system, the
second of six
periods of the...
-
after the
Borrowdale area of the Lake District, in England. They are
Caradocian (late Ordovician) in age (roughly 450
million years old). It is thought...
- Ma
falls in a
range between the
Caradocian and the Ashgillian. The
choice of
setup is important,
because the
Caradocian setup is more
likely to produce...
-
Ordovician System,
comprising all
those rocks deposited worldwide during the
Caradocian Age (458 to 448
million years ago). The
limits of Murchison's Caradoc...
- (26 x 25 millimetres) of
middle Ordovician age (Soudleyan Stage, ~mid-
Caradocian) from the main
cliff at Dob's Linn (about 36.1-43.1
metres below the Ordovician-Silurian...
-
numerous igneous intrusions of two main age groups:
those related to the
Caradocian Snowdonian volcanism and
those emplaced during the
Caledonian orogeny...
- of
Llandeilian to
Caradocian Age.
Above this is a
lenticular limestone called Urbana Limestone and
shale and
sandstone of
Caradocian to
Asghilian Age....
-
subfamily Concavodontinae.
Emiliodonta is
known solely from late Ordovician,
Caradocian epoch,
fossils found in
South America. The
genus contains a
single accepted...
-
consists already of 15
different taxa and
belongs to the
fifth stage (Lower
Caradocian).
During the
Middle Ordovician (Upper Darriwilian)
radiolarites were formed...
-
mainly andesitic lavas and tuffs, with
related minor intrusions is of
Caradocian (Sandbian to
Early Katian) age. In
terms of
their chemistry the EVG are...
