Non-Skeletal Grain types

Aggregate Grains

1. Aggregate Grains

Packstone with aggregate grains of ooids with micritic binding either with complete coating (botryoidal lumps) or with micritic binding in the inter-granular space (lumps).

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2. Aggregate Grains

Grainstone with botryoidal lumps of two ooids with ooidal type coating. Thin section stained with both alizarin red (pink calcite) and potassium ferricyanide (blue ferroan calcite).

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

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3. Aggregate Grains

Grainstone with two ooids bound together as a grapestone. Thin section stained with both alizarin red (pink isopachous calcite cement) and potassium ferricyanide (blue ferroan calcite of burial diagenesis).

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

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4. Aggregate Grains

Grainstone with different types of coated and aggregated grains. Oncoids at the nuclei the calcified cyanobacteria Cayeuxia and solenoporacean algae. Micritic rims are partly due to micro-boring and partly due to accretionary micritic laminae coating (oncoids). In the lower part, rounded cortoids are bound together in a lump by dark micritic crusts.

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

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5. Aggregate Grains

Compound grain composed of oncoids. The cortices of the oncoids contain foraminifera.

Upper Jurassic (Oxfordian), Oxfordshire, UK

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6. Aggregate grains

Grapestone and botryoidal lumps from Mississippian ramps.

Holkerian, Visean (Mississippian), Hunts Bay Oolite, Gower, South Wales, UK

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botryoidal lump of ooids

botryoidal lump

ferroan calcite spar

grapestone of ooids

ferroan calcite spar

Cayeuxia with oncoidal coating

lump of cortoids

Aggregate Grains

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botryoidal lump of ooids

botryoidal lump

ferroan calcite spar

grapestone of ooids

ferroan calcite spar

Cayeuxia with oncoidal coating

lump of cortoids