| 21. | The pyrite concretions typically are about 30 cm ( 1 foot ) in diameter.
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| 22. | The structure is very futuristic, and it is similar to a coralline concretion.
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| 23. | It contains large ( up to 15 feet in diameter ) sandy calcareous concretions.
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| 24. | Do similar indented concretions exist in other areas?
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| 25. | The arthropods in the upper member of the Barstow Formation are preserved in concretions.
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| 26. | It is the most common beetle found in the concretions from the Barstow Formation.
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| 27. | Large calcareous concretions commonly occur within this formation.
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| 28. | In the second room, there are also quirky and stalactites concretions like swords.
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| 29. | The process that created the septaria, which characterize septarian concretions, remains a mystery.
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| 30. | The surface of these spherical concretions can range from being very rough to quite smooth.
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