Skeletal Grain types

Gastropods

1. Gastropod

Skeletal peloidal grainstone with sparse coated grains. In the centre-top a transversal section of a gastropod mould with original aragonite replaced by calcite spar preserved because of the micrite envelope.

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2. Gastropod

Skeletal packstone with gastropods, bivalves, ostracods and Charophytes algae. Gastropods are preserved as moulds filled by clay and silt-grade carbonate sediment (in geopetal orientation) and calcite spar.

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3. Gastropod

Rudstone/packstone with reworked clasts and bioclasts. This deposit represents a transgressive lag at the base of a high-frequency shallowing upward cyclothem in an inner ramp. The gastropod on the centre-right is filled and surrounded by carbonate mud matrix.

Mississippian, South Wales, UK

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4. Gastropod

Skeletal packstone with foraminifera and peloids with a several mms long gastropod in longitudinal section. The gastropod shell exhibits geopetal filling and an oncoidal coating by the alga Archaeolithophyllum lamellosum and micrite crusts.

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

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5. Gastropod

Mollusc-dominated skeletal rudstone/packstone with fragments of bivalves and gastropods. Large longitudinal section of a gastropod on the left side.

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6. Gastropod

Peloidal packstone with a biomould of gastropod dissolved because of its original aragonite composition.

Lower Jurassic, High Atlas, Morocco, cf. Verwer et al. (2009a)

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7. Gastropod

Longitudinal (right) and transverse (left) sections through spired gastropods from Permian deposits of the Karachaganak Field, Kazakhstan. Field of view 2 mm.

Permian, Karachaganak Field, Kazakhstan

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8. Gastropod

Peloidal packstone with gastropods

Mississippian, South Wales, UK

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9. Gastropod

Packstone with microconchids (vermiform gastropods) from the Mississippian carbonate ramps of N England.

Mississippian, North England, UK

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10. Gastropod

Steinkern of reworked gastropod: the sediment that infilled this gastropod was lithified, the aragonitic shell was dissolved and the infill cast was reworked in a storm layer.

Cretaceous, Turonian, Miskar Field, offshore Tunisia

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gastropod biomould and micrite envelope

calcite spar cement

gastropod

micrite geopetal filling within gastropod

gastropod

gastropod

Archaeolithophyllum lamellosum coating

gastropod faecal pellets infill

gastropod biomould

peloidal packstone

Gastropods

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gastropod biomould and micrite envelope

calcite spar cement

gastropod

micrite geopetal filling within gastropod

gastropod

gastropod

Archaeolithophyllum lamellosum coating

gastropod faecal pellets infill

gastropod biomould

peloidal packstone