GeologyRocksDunham Classification
Fri, 01/12/2007 - 21:57 — Jon
A classification of limestone based on depositional textures. The classification consists of mudstone (<10% grains, >90% mud), wackestone (>10% grains, mud supported), packstone (grain supported, but contains mud), grainstone (grain supported, no mud) and boundstone (grains bound in situ, i.e. reef).
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Recognisable Depositional Texture |
Crystalline |
||||
|
Components not bound together |
Original components bound together |
Crystalline Carbonate | |||
|
Contains Mud |
Lacks mud and is grain supported |
Boundstone | |||
|
Mud Supported |
Grain Supported |
Grainstone | |||
|
<10% grains |
>10% grains |
Packstone | |||
| Mudstone | Wackestone | ||||
Folk's Classification is an alternate means of classifying limestones.