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 4:43 PM

Sweden’s No Lockdown Policy: How That Changed The Outcome

Sweden has gone against conventional wisdom in its response to the COVID-19 situation. While the neighbouring countries like Denmark, Finland and Norway imposed strict lockdown on the places and services frequented by the public, Sweden has chosen to not do so at all during the initial phases when COVID-19 started taking the shape of a worldwide pandemic. The public places like Cafes, restaurants, gyms, malls, playgrounds, ski slopes and some of the schools were kept open all across Sweden.

The country’s fight against the threat of pandemic was handled exclusively by the Public Health Authority, with no political interference. They believed that a lockdown only serves to delay the virus, which is not necessary since the health services are equipped to deal with the cases. They also made it clear that achieving herd immunity is also not their aim. The public authorities in Sweden instead relied on the public's sense of responsibility, and appealed to them to do frequent hand washing, observe social distancing and keep people over 70 years old from going out.

The state epidemiologist, Anders Tegnell, made multiple statements about the state’s unusual approach, such as 1) “Once you get into a lockdown, it’s difficult to get out of it,”, “How do you reopen?  When?” 2) “There is no evidence whatsoever that doing more at this stage would make

any difference. It’s far better to introduce stringent measures at very specific intervals, and keep them running for as little time as possible” , 3) " As long as the healthcare system reasonably can cope with and give good care to the ones that need care, it's not clear that having the cases later in time is better”.

The assumption of public responsibility did not work for Sweden and there were people out on the streets, in cafes, restaurants and playgrounds. Not wearing a mask was the social norm instead of the reverse. The models for charting the virus spread given by the concerned authorities also turned out to be faulty forcing them to rescind it. Over 2000 Swedish researchers and doctors signed a petition which claimed that there was not enough testing,tracking or isolation in the country. They believed that the authority has clearly not planned their response and that the authority’s claim for herd immunity has very little scientific basis, even though the government has repeatedly claimed that herd immunity is not what they were aiming for.

Sweden’s lax approach to the combating of coronavirus forced its neighbouring Scandinavian countries to close the border for the Swedish citizens. Some of the Swedish officials were worried for the possible harm to the long term relations between Sweden and its neighbours.  Also, the plan of letting life go on as usual to avoid the economic recession occurring due to a lockdown also failed as it didn’t shield  the country from economic slowdown.

Here comes the question; was the lockdown successful or not? There are some comparisons that have been drawn which indicate more deaths per 100,000 people than in nearby countries with homogenous population, even though it is significantly lesser than some of the European countries. While the infections rates are double that of Denmark, the death rates in comparison are much higher. This difference has been attributed to the fact that approximately half of these deaths have occurred in old care homes despite the stated priority of the officials to protect the elderly. This has been in part to the volunteer program, which replaced symptomatic old age home cares with new volunteers, hence increasing exposure. Another factor is the lack of protective equipment in such homes, along with laws preventing administration of medical procedures without the presence of doctors. There were reports of people threatened with lawsuits for banning visitors.

All of this led to Mr.Tegnell claiming that the ideal policy would have been something between what Sweden adopted and what the other countries did, in the light of what they know now. However this claim of Mr.Tegnell will be put to test when the second wave comes, later in time.

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