Oncoid / Stromatolite, Cambrian, Algeria

Oncoid / Stromatolite, Cambrian, Algeria

Product number: F907

€47.00*

* Prices incl. VAT plus shipping costs

Available, delivery time: 1-3 days

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Product information "Oncoid / Stromatolite, Cambrian, Algeria"

Very nice exemplary piece.

Age: Cambrian
Locality: Hamada du Guir, Algeria
Size: 9 x 8 x 7 cm

Oncoids (stromatolites) preferably form in turbulent, shallow tropical seas. Cyanobacteria (blue-green algae) or red algae enclose a core, such as a shell fragment or a small stone with fine algal mats, deposit calcium carbonate, creating layers upon layers. Oncoids are roundish, tuberous and unconsolidated stromatolites (Logan et al. 1964), the formation of which is attributed to the involvement of cyanobacteria.

The photo may differ slightly in color from the original due to technical reasons.

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ebenso empfehlenswert / to recommend

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Stromatolite ( approx. 3 x 8 cm)

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High polished disk of cyanobacteria formed in very shallow seas.Hence the stratification: tidally rhythmic deposition of the sediments of cyanobacteria.Precambrian (2.2 billion years old)Place of discovery: Biwabik Formation, Mary Ellen Mine, Mesabi Range, St. Louis County, Minnesota, USA.Size: 7 x 13 cmColors shown in pictures may differ slightly from the original due to technical reasons.

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Cut block of petrified microbial mats and algage that caught sediment. These only form in very rare conditions, especially in freshwater. The lammelar and columnar structures of the stromatolites are banded with an orange-black color scheme.Mainly grey and green, some red jasper.Age: Kreide, Maastrichtium, El Molino FormationLocality: Süd-Cochabamba, Oruro, BolivienSize: ca. 11 x 5,5 x 4 cmColors shown in pictures may differ slightly from the original due to technical reasons.

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