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Collenia undosa Walcott 1916

Collenia undosa Walcott 1916
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Collenia undosa Walcott 1916

Products description

Is an inexpensive specimen of a fossil stromatolite from the deep Precambrian of the USA.

Es is a polished slap with the speices Collenia undosa from the about 2.2 Billion years old  Biwabik-Iron-Formation of Minnesota. The Site of the Mary Ellen Mine is a classical Banded Iron Formation. Locality. It is knon and valoured for its nice and colourfully preservation. These decorative Stromatolite fossils are sometimes even used for jewellery.
The Cyanobacteria that where incorporated in the bounding of this Stromatolite have likely produced significant amounts of oxygen. This free oxygen bond the FeČ that was solved in the ancient oceans. This process produced the Banded Iron Formations (also known as BIF’s ) world wide at that time in earth history. After all the iron was used up by that process the oxygen concentrations in the Atmosphere and ocean could rise. What lead to the great oxygen crisis  (sometimes also known as the first big extinction). How ever the higher levels of oxygen allowed the life eventually to become more complex.
 
 
 

Location:

Mary Ellen Mine, Mesabi Range, St. Louis County, Minnesota, USA 
Size :about 21 x 18 mm
Age:Precambrian, Lower Proterozoic, Rhyacian, Biwabik Formation  (about 2.2 Ga / 2200 Ma)

Shipping time: 3-4 Days
Product no.: 11624
7,95 EUR
7 % VAT incl.


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