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.

2. Gastropod

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

3. Gastropod

Rudstone/packstone with reworked lithoclasts 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

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)

5. Gastropod

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

6. Gastropod

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

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

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

8. Gastropod

Peloidal packstone with gastropods

Mississippian, South Wales, UK

9. Gastropod

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

Mississippian, North England, UK

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