Skeletal Grain types

Calci-microbes and microbial fabrics

1. Renalcis

Calcified microbes (upper left) comparable to Renalcis within a clotted peloidal micrite microbial boundstone deposited in a Pennsylvanian upper slope.

Pennsylvanian, Asturias; Della Porta et al. (2003, 2004)

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2. Renalcis

Calcified microbes (centre) comparable to Renalcis in an upper slope clotted peloidal micrite microbial boundstone surrounded by micrite crusts and microspar.

Pennsylvanian, Asturias; Della Porta et al. (2003, 2004)

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3. Microbial crusts

Undetermined irregular micrite crusts of possible microbial origin around supposed inozoan sponges in a Bashkirian platform margin microbial boundstone reef.

Pennsylvanian, Asturias; Della Porta et al. (2003, 2004)

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4. Archaeolithoporella

Archaeolithoporella from Permian phylloid algal mounds.

Permian, New Mexico, USA

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5. Ortonella

Calcified cyanobacteria referable to Ortonella from a Moscovian platform margin.

Pennsylvanian, Asturias; Della Porta et al. (2003, 2004)

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6. Ortonella

Cross-section of tubes of calcified cyanobacteria (Ortonella) from a Moscovian platform margin.

Pennsylvanian, Asturias; Della Porta et al. (2003, 2004)

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7. Cayeuxia

Calcified cyanobacteria (Rivulacean) defined Cayeuxia and characterising Jurassic shallow-water platform settings.

Lower Jurassic, High Atlas, Morocco, cf. Verwer et al. (2009a), Della Porta et al. (2013)

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8. Cayeuxia

Calcified cyanobacteria (Rivulacean) defined Cayeuxia and characterising Jurassic shallow-water platform settings.

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

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9. Girvanella

Girvanellacalcified sheaths of cy anobacteria. Tubes are only a few tens microns in diameter.

Ordovician, Cow Head Group, Newfoundland

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Renalcis

Renalcis

micrite crusts and microspar

micrite crusts

Archaeolithoporella

Ortonella

Ortonella

Cayeuxia

Cayeuxia

Calci-microbes and microbial fabrics

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Renalcis

Renalcis

micrite crusts and microspar

micrite crusts

Archaeolithoporella

Ortonella

Ortonella

Cayeuxia

Cayeuxia