Ordovician in a sentence

Bioimmuration is known in the fossil record from the Ordovician Wilson, MA, Palmer, T. J. and Taylor, P. D. (1994) Earliest preservation of soft-bodied fossils by epibiont bioimmuration: Upper Ordovician of Kentucky.

For instance, the conodont Eoplacognathus pseudoplanus has a short range in the Middle Ordovician period. citation If rocks of unknown age are found to have traces of E. pseudoplanus, they must have a mid-Ordovician age.

For instance, the conodont Eoplacognathus pseudoplanus has a short range in the Middle Ordovician period. citation If rocks of unknown age have traces of E. pseudoplanus, they have a mid-Ordovician age.

Almost all the previous examples are from the Cambrian Period but Castle Bank dates from the Middle Ordovician, some 50 million years later.

A piece of limestone with fossilized meteorite and nautiloid shell from the mid-Ordovician period, recovered from Kinnekulle, in southern Sweden.

Images beamed back to Earth from Curiosity appear to show patterns similar to Ordovician trace fossils Dr DiGregorio has photographed here on Earth, he claimed.

It was found that rocks were deposited in five major geological periods – the Carboniferous, Devonian, Silurian, Ordovician and Cambrian eras.

An Upper Ordovician cobble with the edrioasteroid Cystaster stellatus and the thin branching cyclostome bryozoan Corynotrypa.

Biochemical sedimentary rocks Outcrop of Ordovician oil shale ( kukersite ), northern Estonia Biochemical sedimentary rocks are created when organisms use materials dissolved in air or water to build their tissue.

Bryozoans are among the three dominant groups of Paleozoic fossils. citation The oldest species with a mineralized skeleton occurs in the Lower Ordovician.

Bryozoans have contributed to carbonate sedimentation in marine life since the Ordovician period.

Charles Lapworth resolved the conflict by defining a new Ordovician system including the contested beds.

Deep-water cephalopods, whilst rare, have been found in the Lower Ordovician—but only in high-latitude waters.

During the Middle Ordovician there was a large increase in the intensity and diversity of bioeroding organisms.

During the Silurian, Gondwana continued a slow southward drift to high southern latitudes, but there is evidence that the Silurian icecaps were less extensive than those of the late Ordovician glaciation.

Flora Green algae were common in the Late Cambrian (perhaps earlier) and in the Ordovician.

Fossiliferous limestone slab from the Liberty Formation (Upper Ordovician) of Caesar Creek State Park near Waynesville, Ohio.

Fossil plants with anatomically preserved xylem are known from the Silurian (more than 400 million years ago), and trace fossils resembling individual xylem cells may be found in earlier Ordovician rocks.

Fossil spores from land plants have been identified in uppermost Ordovician sediments.

Graptolites (Amplexograptus) from the Ordovician near Caney Springs, Tennessee.