(geology) The geologic epoch occurring between the Upper and Lower Ordovician, beginning approximately 460,000,000 years ago.
Middle Ordovician
| Sci-Tech Dictionary: Middle Ordovician |
(′mid·əl ′ör·də′vish·ən)
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 | Champlainian (geology) |
| Chazyan (geology) |
| Llandellian (geology) |
 | How long ago was the Ordovician Period? Read answer... |
| When did the ordovician period start? Read answer... |
| How long was the Ordovician period? Read answer... |
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 | What was the ordovician-silurian extinction? |
| What is Ordovician period's nickname? |
| What are some ordovician plants? |
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 | Sci-Tech Dictionary. McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved. Read more |
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Mentioned in
- Champlainian (geology)
- Chazyan (geology)
- Llandellian (geology)
- Llanvirnian (geology)
- Cyclosteroidea (paleontology)
- Marmor (geology)
- Mohawkian (geology)
- Porterfield (geology)
- Trentonian (geology)
- Whiterock (geology)
- Wilderness (geology)
- Ashby (geology)
- Cyclocystoidea
- Paterinida (brachiopoda)
