Chalk marl
Last modified by Roelof Zwaan on 2021/09/30 15:18
Chalk marl is not present at many places. It is a claylike structure with much CaCO3 present in the structure due to the large amount of fossils preserved in the hardened clay. These fossils date back to the Cretaceous period. Marl itself already contains a large amount of carbonate. It can contain up to 65% of CaCO3. Cretaceous marl can even contain up to 75% of CaCO3. Examples can be spotted close to Main and Dover.
Characterization
Some factors on which it can be recognized:
- The texture is clastic.
- The clasts are not visible with the naked eye and smaller than 0.06 mm.
- It is a soft rock with a toughness of 2.6.
- Its color is white.
- Its clast compose of a mixture of chalk-minerals with a mixture of calcite, aragonite, dolomite and siderite.
- It is smooth to touch.
References
Chalk Marl
| Characteristics | Identification |
|---|---|
| Group | Clastic sedimentary rock |
| Texture | Fine-grained |
| Clasts | <0.06mm |
| Hardness | Soft |
| Color | White |
| Minerals | Calcite, Aragonite, Dolomite and Siderite |
| Touch | Smooth |
| Image | Source |