| 31. | The artifacts recovered included a great many fire cracked rocks and chert flakes.
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| 32. | It includes large flint and chert bifacials that may be of Heavy Neolithic origin.
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| 33. | They made spear points of jasper, quartz, shale, or black chert.
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| 34. | When a chert stone is struck against an iron-bearing surface sparks result.
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| 35. | Flint and chert are the most commonly knapped materials and are compact cryptocrystalline quartz.
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| 36. | The quarries consist of beds of white-grey limestone separated by chert beds.
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| 37. | Plants demonstrate best the great value of the exceptional preservation of the Rhynie chert.
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| 38. | This is a chert containing oxidized iron in the form of hematite and goethite.
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| 39. | Some of the chert clasts actually contained fossils.
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| 40. | Here radiolarian cherts overlie spilites and volcanic rocks.
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