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