-
Whitlandian Rangerian Castlemainian Lower Ordovician Floian Ibexian Blackhillsian Chewtonian Yiyangian Bendigonian Moridunian Tulean Lancefieldian Tremadocian...
- new genera, with
species from the
Early Ordovician (Floian; Tulean,
Blackhillsian) of the
Great Basin,
western USA". Zootaxa. 4525 (1): 1–152. doi:10...
- new genera, with
species from the
Early Ordovician (Floian; Tulean,
Blackhillsian) of the
Great Basin,
western USA". Zootaxa. 4525 (1): 1–152. doi:10...
- new genera, with
species from the
Early Ordovician (Floian; Tulean,
Blackhillsian) of the
Great Basin,
western USA". Zootaxa. 4525 (1): 1–152. doi:10...
- (2009). "Trilobite
biostratigraphy and
revised bases of the
Tulean and
Blackhillsian stages of the
Ibexian Series,
Lower Ordovician,
western United States"...
-
pliomerid trilobites from the
Lower Ordovician (Ibexian;
Tulean and
Blackhillsian) of the
Great Basin,
western USA" (PDF). Zootaxa. 2969: 1–68. doi:10...
-
found in Greenland, Texas, and Utah. They all date to the
Upper Floian (
Blackhillsian)
within the
Ordovician Period.
Aponileus was
initially cir****scribed...
- Canadian,
preceded by the Jeffersonian, and is
equivalent to the
upper Blackhillsian stage of the
Ibexian which has been
sought to
replace the
Canadian as...
