- In geology, the
Arenig (or
Arenigian) is a time
interval during the
Ordovician period and also the
suite of
rocks which were
deposited during this interval...
- 1962. Its age, as
given in the
Treatise on
Invertebrate Paleontology is
Arenigian.
Bajkaloceras is
characterized by an
orthonic s**** with an elliptical...
-
quartzose sandstones known as the
Stiperstones Quartzite Formation. This
Arenigian age rock unit
which dips
steeply to the WNW is
between 120 and 325m thick...
- age are
found is
Middle Canadian and
roughly equivalent to the
Lower Arenigian. The
Jeffersonian which is the
Lower Upper Canadian is
based on the dolomitic...
-
genus of
nautiloid cephalopods found only in
upper Lower Ordovician,
Arenigian,
carbonates on
Svalbard Island and Jan
Mayen Island. The type and only...
-
record the
appearance of
mineralized skeletons in this phylum. By the
Arenigian stage of the
Early Ordovician period,
about 480 million
years ago, all...
-
marine sediments of
Demingian through the C****inian age, (essentially
Arenigian, =
early Middle -Upper Canadian) .
Pilocerids split off from the Proterocameroceratidae...
-
Glenogle Formation or
Glenogle Shale is a
stratigraphic unit of
Ordovician (
Arenigian to
early Caradocian) age. It is
present on the
western edge of the Western...
-
suspension feeders. They
lived in the
Paleozoic Era,
Ordovician Period,
upper Arenigian age (between 478.6 ± 1.7 and 471.8 ± 1.6
million years ago) to the Carboniferous...
-
Trilobite fossils are
common in the shale. The
Barrios Formation is
Arenigian and up to 500
metres (1,600 ft) thick. It
consists of a
white m****ive...
