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Lower Ordovician
(redirected from Early Ordovician)

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Lower Ordovician [′lō·ər ‚ȯr·də′vish·ən]
(geology)
The earliest epoch of the Ordovician period of geologic time, extending from about 490- to 460,000,000 years ago.
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INTRODUCTION The trilobite order Proetida Fortey & Owens, 1975, comprises at least 470 Early Ordovician to Permian genera worldwide.
Distribution of the order Proetida (Trilobita) in Baltoscandian ... by Parnaste, Helje; Popp, Adrian; Owens, Robert M. / Estonian Journal of Earth Sciences
A precise worldwide correlation of early Ordovician graptolite sequences.
The Early Ordovician trilobite distribution and zonation of the East ... by Parnaste, Helje / Proceedings of the Estonian Academy of Sciences: Geology
The stone occurs in beds of the upper member of the Late Cambrian to Early Ordovician Strites Pond Formation (Salad Hersi et al.
Geology of the Parliament Buildings 5: Geology of the Manitoba ... by Young, Jeff / Geoscience Canada
 
 
 
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