Carbonate Rock Classification

Rudstone

1. Rudstone/packstone

Grain-supported with carbonate mud matrix between grains; more than 10% of grains is > 2 mm. Skeletal grains include upper Cretaceous inoceramid bivalve prismatic shell and planktonic foraminifera.

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

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2. Rudstone/packstone

Grain-supported with carbonate mud matrix between grains; more than 10% of grains is > 2 mm. Skeletal grains include upper Cretaceous inoceramid bivalve prismatic shell, planktonic foraminifera and crinoids.

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

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3. Rudstone/grainstone

Grain-supported with cement (calcite spar) between grains; skeletal grains (Chaetetes calcareous sponge), intraclasts and peloids are abraded, with micrite envelopes and re-worked; more than 10% of grains is > 2 mm. The thin section is stained with alizarin red.

High Atlas, Morocco, cf. Merino-Tome' et al. (2012), Della Porta et al. (2013)

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4. Rudstone/grainstone

Grain-supported with cement (isopachous rims of marine radial fibrous cement and calci-mudstone as internal sediment of interparticle porosity) between grains; skeletal grains (coral fragments, calcareous sponges) are re-worked from a reef belt at platform margin; more than 10% of grains is > 2 mm.

High Atlas, Morocco, cf. Merino-Tome' et al. (2012), Della Porta et al. (2013)

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Rudstone/packstone

Inoceramus bivalve

planktonic foraminifera

Rudstone/packstone

Inoceramus bivalve

Crinoid

Rudstone/grainstone

Aggregate Grain

Micrite Coated

Chaetetes sponge fragment

Radial fibrous cement

Geopetal internal sediment

Rudstone

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Rudstone/packstone

Inoceramus bivalve

planktonic foraminifera

Rudstone/packstone

Inoceramus bivalve

Crinoid

Rudstone/grainstone

Aggregate Grain

Micrite Coated

Chaetetes sponge fragment

Radial fibrous cement

Geopetal internal sediment