| 31. | Deposition begins with the lower Ordovician So ! uksu Formation.
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| 32. | He also researched microfossils from the Scandinavian Silurian and Ordovician.
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| 33. | During the ensuing Ordovician, Michigan remained inundated by seawater.
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| 34. | Ordovician trilobites left behind remains in northern and southwestern Illinois.
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| 35. | Early Ordovician life of Minnesota included cephalopods, gastropods, and trilobites.
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| 36. | The state's Early Ordovician cephalopods could achieve lengths between long.
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| 37. | Ordovician America was still home to a wide variety of marine invertebrates.
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| 38. | How could a modern artifact be stuck in Ordovician rock?
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| 39. | The answer is that the concretion itself is not Ordovician.
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| 40. | Formation of the Sinnipee Group took place in the Ordovician.
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