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Ordovician
(redirected from Ordovician system)

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Ordovician
of, denoting, or formed in the second period of the Palaeozoic era, between the Cambrian and Silurian periods, which lasted for 45 000 000 years during which marine invertebrates flourished
Ordovician [‚ȯrd·ə′vish·ən]
(geology)
The second period of the Paleozoic era, above the Cambrian and below the Silurian, from approximately 500 million to 440 million years ago.
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The new chronostratigraphic classification of the Ordovician System and its relations to major regional series and stages and to 613C chemostratigraphy.
Distribution of the order Proetida (Trilobita) in Baltoscandian ... by Parnaste, Helje; Popp, Adrian; Owens, Robert M. / Estonian Journal of Earth Sciences
Conodont biostratigraphy of the Llanvinr-landeilo and Llandeilo-Caradoc Series boundaries in the Ordovician System of Wales and the Welsh Borderland.
Conodonts of the Kivioli Member, Viivikonna Formation (Upper ... by Viira, Viive; Aldridge, Richard J.; Curtis, Stephanie / Proceedings of the Estonian Academy of Sciences: Geology
The Ordovician System includes the Stonington Formation, consisting of interbedded fossiliferous carbonate and shale; the Big Hill Dolomite consisting of argillaceous dolomite and limestone; and the Queenston Shale, consisting of alternating layers of gypsum, limestone, and gray, green, and red shale.
Bedrock Geology of Mackinac County, Michigan by BROWN, LEWIS M.; LEACH, MELANIE A.; REXROAD, CARL B.; RIBANT, MICHELLE; LIEURANCE, SUZANNE; SMITH, C / Michigan Academician
 
 
 
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