| 21. | From here, ocean floor turbidite deposits occurred in the Ordovician period.
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| 22. | Their age is conjectured as of Cambrian to Post Ordovician.
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| 23. | Granite from the Cambrian and Ordovician has turned into orthogneiss.
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| 24. | Further Ordovician rock exposures are part of the southern Taunus.
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| 25. | In the Late Ordovician the turbidites were overlaid by a black shale.
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| 26. | The inlet and surrounds are characterized by steep cliffs of Ordovician origin.
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| 27. | By the end of the Ordovician the Tornquist Sea had been eliminated.
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| 28. | The oldest rocks in the quarry comprise late Ordovician siltstones.
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| 29. | The ashlar stone construction is of upper Ordovician fossiliferous limestone.
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| 30. | It is known from the Middle Ordovician of the eastern United States.
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