| 41. | The second feature contained seven concretions.
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| 42. | Many Pierre Shale ammonites, and indeed many ammonites throughout earth history, are found inside concretions.
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| 43. | In concentric growth, the concretion grows as successive layers of mineral precipitate around a central core.
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| 44. | Concretions are often exposed at the surface by subsequent erosion that removes the weaker, uncemented material.
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| 45. | After further study it was decided that the blueberries were concretions formed in the ground by water.
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| 46. | These concretions occur as both spherical cannonball concretions and flat, disk-shaped or oval concretions.
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| 47. | These concretions occur as both spherical cannonball concretions and flat, disk-shaped or oval concretions.
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| 48. | These concretions occur as both spherical cannonball concretions and flat, disk-shaped or oval concretions.
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| 49. | The iron oxide concretions found in the Navajo Sandstone exhibit a wide variety of sizes and shapes.
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| 50. | It forms massive to reniform pappillary aggregates in fractures, bottryoidal concretions in laterite or fracture infill.
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