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Middle Ordovician

   Also found in: Wikipedia 0.03 sec.
Middle Ordovician [′mid·əl ‚ȯr·də′vish·ən]
(geology)
The geologic epoch occurring between the Upper and Lower Ordovician, beginning approximately 460,000,000 years ago.


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2004), has indicated that this stone came from the Middle Ordovician Holston Formation of the Chickamauga Group.
Starting in late Precambrian time, this biological blast extended into the middle Ordovician period.
Over 52 named pay horizons ranging in age from the middle Ordovician to Pennsylvanian produce commercial quantities of oil.
 
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