| 31. | Shipworm-bored petrified wood is the North Dakota state fossil.
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| 32. | The lithic technology suggests extensive reliance on the locally available petrified wood, rhyolite, and quartzite.
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| 33. | Petrified wood rings the top and punches into the edges like ragged soldiers on guard.
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| 34. | Similarly, coral, petrified wood and other organic remains or porous rocks can also become agatized.
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| 35. | Due to the Sonoma Mountain's ancient volcanism, Penngrove is rich with obsidian and petrified wood.
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| 36. | Examples include petrified wood and pyritized gastropod shells.
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| 37. | Petrified wood is extremely common in the creek.
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| 38. | Contemporary plant fossils from Nevada include " twigs " of petrified wood preserved in Eureka County.
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| 39. | Those lignite mounds coincide with most of the petrified wood and fossils found in the Wilderness.
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| 40. | The Sentinel Butte contains an extensive stump-bearing petrified wood bed above the contact at the site.
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