Non-Skeletal Grain types

Peloids

1. Peloids

Peloids (micritic elliptical grains) constitute this packstone with fenestral voids filled by blocky sparite from intertidal depositional environment.

Mississippian, South Wales

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2. Peloids

Peloidal (micritic elliptical grains) skeletal packstone to wackestone with irregular fenestral voids with rare Thaumatoporella parvovesiculifera (shallow subtidal to intertidal).

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

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3. Peloids

Peloidal (micritic elliptical grains and micritized bioclasts) skeletal (foraminifera Archaias) grainstone to packstone with peloids due to sea floor micritization activity by endolithic micro-organisms (lagoon, modern carbonate settings).

Bahamas, Holocene

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4. Peloids

Peloidal (micrite aggregates or faecal pellets) packstone with mm-size voids filled by fibrous cement and equant sparite. Image in parallel polarizers.

Permian, West Texas, USA

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5. Peloids

Peloidal (micrite aggregates or faecal pellets) packstone with mm-size voids filled by fibrous cement and equant sparite. Image in crossed polarizers.

Permian, West Texas, USA

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6. Peloids

Particular type of peloids, generally < 60 microns in diameter, irregular in shape, surrounded by microsparite and equant sparite or fibrous cement, attributed to biologically induced/influenced in situ precipitation of carbonates in the presence of biofilms and degrading organic matter in mound facies.

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

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7. Faecal pellets

Peloidal grainstone with miliolid foraminifera. The ellipsoidal micritic grains are interpreted as faecal pellets and were deposited on a mid-Eocene carbonate ramp.

Middle Eocene, Mukta Field, offshore India

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8. Micritized grains

Peloidal, aggregate and micrite coated grains packstone to grainstone showing micritic grains that might be the result of bioerosion and micritization by endolithic micro-organisms. Lithofacies deposited in a Lower Jurassic (Pliensbachian) lagoon.

Lower Jurassic, High Atlas, Morocco, cf. Verwer et al. (2009), Merino-Tome et al. (2012)

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9. Faecal pellets

Grainstone with faecal pellets.

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Peloids

Peloids

fenestrae

Peloids

Peloids

Thaumatoporella parvovesiculifera

Peloids

peloid as micritised bioclast

foraminifer Archaias

Peloids
Peloids
Peloids

miliolid foraminifer

Peloids

CLOSE

Peloids

Peloids

fenestrae

Peloids

Peloids

Thaumatoporella parvovesiculifera

Peloids

peloid as micritised bioclast

foraminifer Archaias

Peloids
Peloids
Peloids

miliolid foraminifer