| The formerly aragonitic specimens are preserved as moulds and the calcitic faunal elements are usually partly decalcified. |
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| Geopetal infillings in the internal cavity of the shells were observed and represented by poorly lithified micritic and aragonitic cement. |
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| Both specimens retain their original calcitic outer shell layer, original aragonitic middle and inner shell layers, and remnants of aragonitic ligament fibers. |
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| The Atlantic and Gulf Coastal Plains of the United States contain assemblages preserved as original aragonitic and calcitic material in unconsolidated sediments. |
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| The mineralogic composition of carbonate platforms may be either calcitic or aragonitic. |
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