- Carboniferous, is a
subperiod in the
geologic timescale or a
subsystem of the
geologic record. It is the
earlier of two
subperiods of the Carboniferous...
- Carboniferous) is, on the ICS
geologic timescale, the
younger of two
subperiods of the
Carboniferous Period (or the
upper of two
subsystems of the Carboniferous...
-
mammals and
their extinct relatives,
originated during the
Pennsylvanian subperiod (~323 million to ~300 million
years ago), when they
split from the reptile...
- 330
million years ago
during the
Carboniferous Period,
Mississippian Subperiod Chronology Etymology Name
formality Formal Nickname(s) Age of Amphibians...
- and
northeastern Oklahoma. It
preserves fossils of the
Mississippian subperiod including crinoids, brachiopods, bryozoa, conodonts, blastoids, ostracods...
-
juxtaposition of
elements from the
Queen Anne
subperiod (1702–1714),
George I
subperiod (1714–1727) and
George II
subperiod (1727–1760). The
cabriole leg, later...
-
margin existed until Laurasia and
Gondwana collided in the
Pennsylvanian subperiod to form Pangea.
Pangea began to
break up in the Tri****ic, but seafloor...
-
times during the
Carboniferous Period (Mississippian and
Pennsylvanian Subperiods),
yielding a
variety of rock
strata that
dominate the
bedrock today. The...
-
Ordovician period, and
reached their greatest diversity in the
Mississippian subperiod of the
Carboniferous period. However,
blastoids may have
originated in...
- Virginia. It
preserves fossils dating back to the
early Mississippian subperiod of the
Carboniferous period.
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