| 21. | Large numbers of goniatites also occur in rocks from the Devonian period of Morocco.
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| 22. | Rocks of the Devonian Period are also referred to as the Old Red Sandstone.
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| 23. | All of these rock formations date to the Devonian Period.
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| 24. | This formation consists of sandstone and siltstone and comes from the Mississippian and Devonian periods.
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| 25. | The site shows an unconformity between Silurian rocks and quartz conglomerate of the Devonian period.
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| 26. | They are fragments of a coral reef that was originally deposited during the Devonian period.
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| 27. | The analysis moves divergence of the extant suborders from the Devonian Period to the Carboniferous.
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| 28. | Prior to the late Devonian period, there was little plant life beyond lichens, and bryophytes.
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| 29. | Tennessee was still submerged into the ensuing Devonian period.
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| 30. | Ticklish Rock is part of Pennsylvania's Catskill Formation, which was formed during the Devonian period.
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