| 1. | They used spears made of bone, jasper or black chert.
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| 2. | The chytrids display a range of behaviour in the Rhynie chert.
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| 3. | Siliceous ooze are modified and transformed during burial into bedded cherts.
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| 4. | Most of them are crude cutting instruments made of chert and shale,
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| 5. | Chert also occurs in diatomaceous deposits and is known as diatomaceous chert.
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| 6. | Chert also occurs in diatomaceous deposits and is known as diatomaceous chert.
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| 7. | Cherts are subject to problems when used as concrete aggregates.
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| 8. | The red Strong Island Chert for instance rests on ophiolites.
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| 9. | Several different kinds of chert were available in the area.
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| 10. | Breccia, chert, calcite and gypsum deposits can also be found.
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