Changes

Folk defined a fourth family based on in situ organic growth deposits: biolithite.[d]

Folk defined a fourth family based on in situ organic growth deposits: biolithite.[d]

[[File:GeoWikiWriteOff2021-Abdulwahab-Figure1.png|thumbnail|Folk classification system for carbonate rock (1959) [1]]]

[[File:GeoWikiWriteOff2021-Abdulwahab-Figure1.png|center|framed|{{figure number|1}}Folk classification system for carbonate rock (1959) [1]]]

   

   

===Subdivision of Major Families===

===Subdivision of Major Families===

Family I and II of Folk’s system could be subdivided based on the type of allochems presented. The most important types of allochems are: intraclasts, oolites, fossils, and pellets respectively. A total of eight subdivisions are diagrammatically presented in Figure 2.[e]   

Family I and II of Folk’s system could be subdivided based on the type of allochems presented. The most important types of allochems are: intraclasts, oolites, fossils, and pellets respectively. A total of eight subdivisions are diagrammatically presented in Figure 2.[e]   

[[File:GeoWikiWriteOff2021-Abdulwahab-Figure2.png|thumbnail|Fig. 2 Folk subdivisions of major families [2] ]]  

[[File:GeoWikiWriteOff2021-Abdulwahab-Figure2.png|center|framed|{{figure number|2}}Folk subdivisions of major families [2]]]  

Family I subdivisions

Family I subdivisions

• Intrasparite: consists of intraclasts with sparry calcite cement (Figure 3).

* Intrasparite: consists of intraclasts with sparry calcite cement (Figure 3).

• Oosparite: consists of oolites with sparry calcite cement (Figure 4).

* Oosparite: consists of oolites with sparry calcite cement (Figure 4).

• Biosparite: consists of fossils with sparry calcite cement (Figure 5).

* Biosparite: consists of fossils with sparry calcite cement (Figure 5).

• Pelsparite: consists of pellets with sparry calcite cement (Figure 6).

* Pelsparite: consists of pellets with sparry calcite cement (Figure 6).

Family II subdivisions

Family II subdivisions

• Intramicrite: consists of intraclasts with microcrystalline matrix (Figure 7).

* Intramicrite: consists of intraclasts with microcrystalline matrix (Figure 7).

• Oomicrite: consists of oolites with microcrystalline matrix (Figure 8).

* Oomicrite: consists of oolites with microcrystalline matrix (Figure 8).

• Biomicrite: consists of fossils with microcrystalline matrix (Figure 9).

* Biomicrite: consists of fossils with microcrystalline matrix (Figure 9).

• Pelmicrite: consists of pellets with microcrystalline matrix (Figure 10).

* Pelmicrite: consists of pellets with microcrystalline matrix (Figure 10).

===Depositional Energy Setting and Reservoir Quality Indications===

===Depositional Energy Setting and Reservoir Quality Indications===

6. Unsorted biosparites: poorly sorted rocks in which the current was strong enough to winnow away lime mud particles, but the allochems are still not sorted.  

6. Unsorted biosparites: poorly sorted rocks in which the current was strong enough to winnow away lime mud particles, but the allochems are still not sorted.  

7. Sorted biosparites: well-sorted rocks in which the allochems are still not well-rounded and abraded.

7. Sorted biosparites: well-sorted rocks in which the allochems are still not well-rounded and abraded.

8. Rounded biosparites: well-sorted and well-rounded rocks in which the allochems underwent intense abrasion.  

8. Rounded biosparites: well-sorted and well-rounded rocks in which the allochems underwent intense abrasion.

==Dunham Classification==  

==Dunham Classification==