Wednesday, July 1, 2020

World's largest graveyard of Dinosaurs found in South Africa

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Nikhita Gautam

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World's largest graveyard of Dinosaurs found in South Africa

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Global Views 360

Publication Date

July 1, 2020

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‘African dinosaurs’ exhibit at the Iziko South African Museum in Cape Town

‘African dinosaurs’ exhibit at the Iziko South African Museum in Cape Town | Source: Bruce Anderson via Wikimedia

In a village in the eastern cape of South Africa lies one of the most significant dinosaur sites ever found in the world. The site was discovered when a shepherd, Dumangwe Thyobeka found a large bone on his way to his great-grandparents’ graves, in 2015. He then took the bones to a local dinosaur enthusiast, James Rhalene. Commenting on this discovery " Mr. Rhalene said, "Growing up we were told dinosaurs were a myth, I thought they were only tales our grandparents would tell around the fire at story time", and It wasn't until reading some books that I started to believe they may be real. I've been looking into the existence of dinosaurs since 1982. He added, "You can imagine my excitement at being part of this and discovering them in my own backyard. I am so proud. Books will be written about our small village; the world will come to know of us through this discovery.”

These bones are more than 200 million years old, of around the end of the Triassic era and the beginning of the Jurassic one. When the village elder, Sginyane Ralane came to know about the discovery, he reached out to universities in South Africa for looking into it. The news eventually reached Prof. Jonah Choiniere from the University of Witwatersrand in Johannesburg, and in 2018 Jonah and his colleagues started excavating the site. “It has been one of those places where you sometimes find yourself literally tripping over a dinosaur bone. There are very few other sites I've had the chance to work where we have this richness of fossils.” says Prof Paul Barett, a dinosaur expert at The Natural History Museum, UK, after he joined the team.

A reason why this area is abundant in fossils, Natural History Museum explains, is because of the ancient river systems in the area. The area is arid for most of the year now, and the rivers flow only seasonally. However, in the ancient times, there were vast river systems flowing year-round in the region, with wide, shallow rivers which would consequently form a layer of rock 210 million years old which is up to 500 meters thick in some regions. These rivers supported diverse wildlife, including ancestors of crocodiles, possibly those of turtles and mammals and fish, amphibians and reptile-like animals. The existence of such large rivers meant that dead animals nearby would be buried in sediment before they decomposed.  

This discovery is scientifically important for a number of reasons; the era from which these bones are found is a boundary in which a mass extinction occurred. Prof. Jonah is trying to understand how the animals from before that extinction survived and how they flourished after. In the Triassic era, there were multiple dominating animals, like the crocodiles, big mammal-like animals and dinosaurs. In the Jurassic era, however, the dinosaurs are clearly dominating. Why this happened is unclear, and the rocks and fossils from this site might help with that. There were also other animals along with dinosaurs in this site which make it noteworthy. Of the animals found, there were rauisuchians, which relate to modern-day crocodiles, and were dominant on land during the Triassic. The team also found cyclodonts and dicyclodonts, where the cyclodonts are the early ancestors to all mammals, and dicyclodonts are an even earlier branch of the mammalian family tree.

All of these have a significant impact on the community too; the team signed a memorandum of understanding with the local government with huge. After the signing, local officials visited the site at Qhemega. The team has been trying to use the heavy machinery they had brought for moving fossils for improving access in and to the village. They are also developing a curriculum in high schools to include topics about fossil sites and to add geography to the curriculum, to train the younger generation about the mapping used in excavation and in many other scientific fields especially relevant in the mineral-resource rich South Africa.

So far, this site has only provided benefits for everyone involved; new discoveries and confirming data for the scientific community, and economic access, increased opportunities and a matter for pride for the local community.

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February 4, 2021 4:58 PM

Tanzanite Gemstone: Changing the future of Tanzania’s small miners

A beautiful gemstone with a wide range of colours, from light to dark hues of blue and violet, found only in a patch 4 kilometres long and two kilometres wide at the foot of mount Kilimanjaro in Tanzania. Existing supply of these gems would run out in about 20 years and finding it in any other region has the probability of just one in a million. Tiffany & Co, the American jewelry manufacturer, described it as “the most important gemstone discovery in over 2000 years”. Yes, we are talking about Tanzanite, the pride of Tanzania.

This rare gemstone was in news recently when a small time miner, Saniniu Laizer found two large weighing 9.27 and 5.103 kgs which are the two largest tanzanite gemstones ever found. This discovery turned the miner millionaire overnight as those pieces were sold at about 3.35 USD. He was congratulated on live television by President John Magufuli, who himself was elected in 2015 with the promise of preservation of the nation’s interest in the mining industry. Mr Laizer’s mining operation includes more than 200 miners and he intends to use the money for the development of a school and a shopping mall near his home.

In order to promote the industry, many reforms were undertaken by the  government of Tanzania. It started taking a 50% equity in all mining projects after 2010 and banned the export of large sized raw gemstones. A fence was also built  in 2018 around the whole area where Tanzanite is mined but about 40% are siphoned without paying any royalty to the government.

However the discovery of such gemstones by a small miner was made possible due to the government policy of promoting local artisanal miners. In order to foster local ownership, the government gave the land and exclusive mining rights to the artisanal miners who mostly owned small and medium establishments. Many trading centres were established by the government in 2019  to facilitate these miners sell gems and gold directly to the government and earn better revenue.

Such discoveries sound promising for the industry in the light of how extensively they are promoted, and how many effective actions the government has taken to protect the industry. This also acts as a big morale booster for the small miners to redouble their efforts and search for the gemstones more vigorously.

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