Here is a polished section of a banded iron ore from the Kuruman Iron Formation in South Africa. Compared to classical tiger iron ores, does the Kuruman Iron formation exhibits a lower degree of metamorphic overprinting.
A microbialite is a sedimentary rock structure formed through the activity of microorganisms such as bacteria or algae. These microorganisms influence the deposition of minerals by triggering processes like biomineralization. Microbialites are often layered and exhibit characteristic structures .They play an important role in understanding Earth's history, as they represent fossils of ancient life forms and provide insights into the environmental conditions of the past.
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| | Location: | Prieska, Kaapvaal Craton, Northern Cape, South Africa | |
| Size : | about 42 x 50 mm |
| Age: | Precambrian, Lower Proterozoic,
Kuruman Iron Formation (ca. 2700 Ma) |
