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

Stromatoporoid

Chaetetes

Peloidal internal sediment

Calcite spar

Scleractinian coral

Corals

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Rugose coral

Rugose coral

Auloporid coral

Chaetetes

Rugose coral

Scleractinian coral colony

Phaceloid scleractinian coral

Scleractinian coral colony

Stromatoporoid

Chaetetes

Peloidal internal sediment

Calcite spar

Scleractinian coral