Authentic Banded Iron Kuruman, Transvaal SuperGroup, South Africa
The banded iron formations found on our planet were deposited during the first 2 billion years of Earth's geological history. It is the most significant evidence we have for determining the nature of the early atmosphere and how the stage was set for the beginning of life.
The distinct alternating layers of red, iron-depleted silica with the distinctively dark, contrasting silver to black iron oxide layering are sedimentary in origin, but have been highly metamorphosed over time. The fascinating biochemical origin of Banded Iron Formation rocks make them important specimens in serious geological collections.
In earth's early history the young oceans contained reduced iron that had been washed into them over time from continents. This iron combined with the nascent oxygen produced by photosynthetic bacteria then settled on the ocean floors. The bacterial cycle of growth - bloom and then bust - of seasonal feedback oscillations in the oceans formed a complex feedback loop of unique geological layering, now known as banded iron formations.
The Kuruman banded iron formation is estimated to be about 2460 million years old and is part of the Transvaal Supergroup located in the Northern Cape Province, South Africa. This is the peak time for banded iron formation building on our young planet. The transition from the anaerobic atmosphere to the oxygenated atmosphere (Great Oxygen Event) is what scientists believe is the chief motivator for the early evolutionary pathways, that eventually led to the diversification of life on Earth.
Some of the oldest rock formations contain banded iron, and in the majority of cases it is comprised of high iron and silica. Since they have not formed since Precambrian time, a very unique set of circumstances in our planets early history must have existed that is not present since that time.
This is a great specimen of banded iron BIF, sculpted by the winds of the Kalahari. It has 2 cut faces and the rest is ventifacted. Size: 52mm H X 35mm W X 39mm D, Weight: 117.8 grams
Ships with tag, information and certificate of authenticity. Legally collected on private land. Stands, cube not included.
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