- 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...
- with
forms like Ancistroceras.
Their diversity increased after the late
Arenigian extinction (Floian-Dapingian) at the end of the
Canadian Epoch and take...
-
record the
appearance of
mineralized skeletons in this phylum. By the
Arenigian stage of the
Early Ordovician period,
about 480 million
years ago, all...
-
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...
-
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...
-
impoverished fauna dates back well into the
second stage of the
Ordovician (
Arenigian). The
youngest fauna consists already of 15
different taxa and belongs...
- 1962. Its age, as
given in the
Treatise on
Invertebrate Paleontology is
Arenigian.
Bajkaloceras is
characterized by an
orthonic s**** with an elliptical...
-
genus of
nautiloid cephalopods found only in
upper Lower Ordovician,
Arenigian,
carbonates on
Svalbard Island and Jan
Mayen Island. The type and only...
- Uchman, Alfred; Reolid,
Matias (19
December 2014). "Lower
Ordovician (
Arenigian) shallow-marine
trace fossils of the
Pochico Formation,
southern Spain:...
-
marine sediments of
Demingian through the C****inian age, (essentially
Arenigian, =
early Middle -Upper Canadian) .
Pilocerids split off from the Proterocameroceratidae...
