| 31. | Several fossils have been discovered from the Early ( Lower ) Devonian Period of Tillywhandland, Scotland.
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| 32. | Chagrin shale, is blue gray in color, an offshore alluvial, silt shale of the Devonian period.
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| 33. | During the ensuing Devonian period, the sea returned to southern Minnesota and local sediment deposition resumed.
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| 34. | The region's rocks were laid down in the Devonian period and are known as Rhenish Facies.
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| 35. | These are in part overlain by Old Red Sandstone rocks formed later in the Devonian period.
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| 36. | The first ammonites also appeared during or slightly before the early Devonian Period around 400 Mya.
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| 37. | Limestone shelves along the lake shore contain the fossils of marine animals from the Devonian period.
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| 38. | These sedimentary rocks are from the Devonian period, laid down 395 to 345 million years ago.
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| 39. | The sedimentary rocks in Montour County are from either the Devonian Period or the Silurian Period.
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| 40. | The Taunus range originated during the Devonian period.
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