Skeletal Grain types

Bryozoans

1. Fenestellid

Tournaisian Waulsortian mound facies with leiolitic structureless micrite and fenestellid bryozoan.

Mississippian, Ireland

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2. Fenestellid

Tournaisian Waulsortian mound facies with fenestellid bryozoan surrounded by radiaxial fibrous cement (biocementstone).

Mississippian, Ireland

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3. Fenestellid

Tournaisian Waulsortian mound facies with fenestellid bryozoan surrounded by radiaxial fibrous cement (biocementstone) and structureless leiolitic micrite.

Mississippian, Ireland

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4. Fenestellid

Visean mound facies with fenestellid bryozoans surrounded by structureless leiolitic micrite and calcite sparite; a crinoid in the lower right corner.

Mississippian, New Mexico, USA

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5. Fenestellid

Visean mound flank facies consisting of grainstone with fenestellid bryozoans and crinoids cemented by syntaxial calcite.

Mississippian, New Mexico, USA

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6. Fistuliporid

Visean mound flank facies with grainstone of fenestellid and fistuliporid bryozoans and crinoids.

Mississippian, New Mexico, USA

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7. Fistuliporid

Fistuliporid bryozoan surrounded by radiaxial fibrous cement in a Bashkirian upper slope boundstone.

Pennsylvanian, Asturias; Della Porta et al. (2003, 2004)

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8. Fistuliporid

A Moscovian mound facies with bryozoans and clotted peloidal micrite associated with tubular encrusting (centre) and Tuberitina (left and right of centre) foraminifera.

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

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9. Bryozoan

Skeletal packstone with bryozoan fragment (centre) and Gypsina foraminifer (upper left corner) of Eocene age.

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

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10. Bryozoan

Skeletal packstone with foraminifera (Rotalia and Nummulites on the left side), coralline red algae fragments and a bryozoan impregnated with glauconite (top centre).

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

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11. Bryozoan

Skeletal packstone with bryozoan fragments.

Oligocene, Central Apennine, Italy

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12. Bryozoan

Grainstone with bryozoans surrounded by isopachous rims of fibrous cement; sparse planktonic foraminifera in an open marine inner ramp setting.

Oligocene, Central Apennine, Italy

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13. Bryozoan

Skeletal grainstone with bryozoans, lithoclasts (bottom right), Miogypsinoides (centre left) and Amphistegina foraminifera (centre right).

Oligocene, Central Apennine, Italy

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14. Bryozoan

Cretaceous bryozoans (field of view approximately 3 mm)

Lower Cretaceous, Faringdon, UK

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15. Bryozoan

Cross-section of bryozoan in a packstone with echinoderm fragments from Upper Carboniferous ramp facies.

Pennsylvanian, Gobler Formation, Fresnal Canyon, New Mexico

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fenestellid bryozoan

fenestellid bryozoan

radiaxial fibrous calcite

fenestellid bryozoan

radiaxial fibrous cement

fenestellid bryozoan

micrite

fenestellid bryozoan

syntaxial cement on crinoid

fistuliporid bryozoan

crinoid with syntaxial cement

fistuliporid bryozoan

fistuliporid bryozoan

Tuberitina

bryozoan

Gypsina

bryozoan with glauconite

Nummulites

cement isopachous rims on planktonic foram

bryozoan

Miogypsinoides

Amphistegina

Bryozoans

CLOSE

fenestellid bryozoan

fenestellid bryozoan

radiaxial fibrous calcite

fenestellid bryozoan

radiaxial fibrous cement

fenestellid bryozoan

micrite

fenestellid bryozoan

syntaxial cement on crinoid

fistuliporid bryozoan

crinoid with syntaxial cement

fistuliporid bryozoan

fistuliporid bryozoan

Tuberitina

bryozoan

Gypsina

bryozoan with glauconite

Nummulites

cement isopachous rims on planktonic foram

bryozoan

Miogypsinoides

Amphistegina