In the petroleum industry, limestone is usually given a nameusing the Dunham classification, as attached. Forany limestone you can follow the flowchart to find its correctname.
This limestone consists mostly of carbonate mud with about 20%shell fragments that do not touch.
rock name __________________________________
This limestone consists of small and large calcite and dolomitecrystals. No shells or other carbonate grains are visible.
rock name __________________________________
This limestone has broken shells that touch each other, withabout 20% mud between the shells and 15% porosity.
rock name __________________________________
This limestone consists mostly of corals that appear to havegrown in their present position before they died and the coralsbecame rock.
rock name __________________________________
This limestone consists of very well sorted, round carbonategrains and some shells that are touching. It has very goodporosity, and there is no carbonate mud.
rock name __________________________________
This limestone is dark gray, very fine grained and has novisible shells or crystals.
rock name __________________________________
This limestone consists mostly of shells (therefore it is grainsupported), has a little carbonate mud, but also has some quartzgrains.
rock name __________________________________
This limestone consists of rounded shell fragments, roundcarbonate grains, has no mud, and all of the pores have calcitecement.
rock name __________________________________
This limestone has few shells (about 5% of the rock consists ofshells) that do not touch each other but consists mostly ofcarbonate mud.
rock name __________________________________
This limestone consists of 100% shell fragments held together bya calcite cement.
rock name __________________________________
