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).

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)

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)

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)

5. Aggregate Grains

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

Upper Jurassic (Oxfordian), Oxfordshire, UK

6. Aggregate grains

Grapestone and botryoidal lumps from Mississippian ramps.

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