Difference between revisions of "Shell composition"
| Line 3: | Line 3: | ||
* organic-walled | * organic-walled | ||
* [[agglutinated]] (cemented foreign particles/grains) | * [[agglutinated]] (cemented foreign particles/grains) | ||
| − | * secreted calcium carbonate (or | + | * secreted calcium carbonate (calcite or aragonite) |
| − | : | + | : - microgranular |
| − | : | + | : - porcellaneous |
| − | : | + | : - hyaline |
| + | * secreted ???silica (very uncertain) | ||
