Skeletal Grain types

Corals

1. Tabulata

Section of coral Syringopora from Lower Carboniferous carbonate ramp strata.

Mississippian, Clifton Down Limestone, Bristol, England, UK

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2. Rugosa

Oblique section of a solitary rugose coral (original calcite mineralogy) within a micrite-coated grain grainstone.

Pennsylvanian, Asturias, N Spain, cf. Bahamonde et al. (2015, 2017)

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3. Rugosa

Transversal section of a solitary rugose coral within a clotted peloidal micrite boundstone. The upper part is a skeletal peloidal packstone. The contact between the packstone and the coral and clotted peloidal micrite boundstone is a stylolite.

Pennsylvanian, Asturias, N Spain, cf. Bahamonde et al. (2015, 2017)

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4. Auloporid

Auloporid corals (encrusted by Chaetetes on the right) in a restricted lagoonal wackestone.

Pennsylvanian, Asturias, N Spain, cf. Bahamonde et al. (2015, 2017)

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5. Rugosa

Cross-section of originally calcitic rugose coral of Permian age.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

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6. Scleractinia

Colonial scleractinian corals that had an original aragonitic mineralogy from a Pliensbachian platform margin.

Lower Jurassic, High Atlas, Morocco, cf. Verwer et al. (2009b), Della Porta et al. (2013)

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7. Scleractinia

Branching phaceloid scleractinian corals that had an original aragonitic mineralogy from a Pliensbachian platform margin surrounded by micrite crusts and fibrous cement.

Lower Jurassic, High Atlas, Morocco, cf. Verwer et al. (2009b), Della Porta et al. (2013)

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8. Scleractinia

Scleractinian coral colony that had an original aragonitic mineralogy and was replaced by calcite spar from a Pliensbachian platform margin; corals are encrusted by Chaetetes and stromatoporoid sponges (on the right).

Lower Jurassic, High Atlas, Morocco, cf. Verwer et al. (2009b), Della Porta et al. (2013)

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9. Scleractinia

Section of a Mesozoic scleractinian coral: the original aragonite mineralogy was replaced by calcite spar preserving the internal peloidal sediment.

Thin section kindly provided by T. Geel, Vrije Universiteit, Amsterdam

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10. Scleractinia

Colonial and solitary scleractinian corals of Oligocene age encrusted by coralline red algae.

Oligocene, Central Apennine, Italy

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11. Scleractinia

Section of Eocene scleractinian coral.

Eocene, Bassein Formation, Bombay High, offshore India

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12. Scleractinia

Section of Eocene scleractinian corals with the former aragonitic walls replaced by calcite spar.

Eocene, Bassein Formation, Bombay High, offshore India

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rugose coral

rugose coral

auloporid coral

Chaetetes

rugose coral

scleractinian coral colony

phaceloid scleractinian coral

scleractinian coral colony

Chaetetes

Stromatoporoid

peloidal internal sediment

calcite spar

scleractinian coral

Corals

CLOSE

rugose coral

rugose coral

auloporid coral

Chaetetes

rugose coral

scleractinian coral colony

phaceloid scleractinian coral

scleractinian coral colony

Chaetetes

Stromatoporoid

peloidal internal sediment

calcite spar

scleractinian coral