Skeletal Grain types

Echinoderms

1. Crinoid

Crinoidal grainstone with syntaxial calcite cement, bryozoan fragments and Tetrataxid foraminifera.

Mississippian, South Wales, UK

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2. Crinoid

Crinoidal grainstone with syntaxial calcite cement and bryozoan fragments.

Mississippian, New Mexico, USA

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3. Crinoid

Crinoidal packstone with crinoid ossicles affected by micro-borings in a Moscovian outer platform setting.

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

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4. Crinoid

Crinoidal grainstone with syntaxial calcite cement and crinoid ossicles affected by micro-borings and associated with fenestellid bryozoan fragments in a Moscovian outer platform setting.

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

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5. Echinoid spine

Micrite coated grain packstone with a transversal section of a coated echinoid spine (bottom left) and micrite coated Lenticulina.

Lower Jurassic, High Atlas, Morocco, cf. Merino-Tome' et al. (2012)

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6. Echinoid spine

Skeletal wackestone from Tithonian (upper Jurassic) basinal facies containing an echinoid spine (centre) and calpionellids (centre right).

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

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7. Echinoid

Echinoderm fragment (spine?) from Lower Cretaceous strata (field of view 1.6 mm).

Lower Cretaceous, Faringdon, UK

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8. Echinoderm

Porous (blue epoxy) packstone to grainstone with echinoderm plates with syntaxial calcite overgrowths from Eocene strata offshore India.

Eocene, Mukta Field, Bombay High, offshore India

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9. Echinoid spine

Porous packstone to grainstone with an echinoid spine in the centre.

Eocene, Panna Field, Bombay High, offshore India

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10. Echinoid spines

Echinoid spines and a plate in a Cretaceous wackestone.

Turonian (Cretaceous), Miskar Field, offshore Tunisia

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Crinoid ossicle

Tetrataxis

Crinoid

Borings on crinoid

Syntaxial cement on crinoid

Fenestellid bryozoan

Echinoid spine

Lenticulina foraminifer

Echinoid spine

Calpionellid

Echinoderms

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Crinoid ossicle

Tetrataxis

Crinoid

Borings on crinoid

Syntaxial cement on crinoid

Fenestellid bryozoan

Echinoid spine

Lenticulina foraminifer

Echinoid spine

Calpionellid