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 4:51 PM

How Dharavi, Asia’s biggest slum, fought against COVID-19

Imagine a place where 8-10 people live in 100 square feet structures. A place which squeezes close to 6,50,000 people, 5,000 small factories, and about 15,000 single-room workshops in just 2.5 square kilometer area. Welcome to  Dharavi, the biggest slum of Asia situated in the heart of fashion, entertainment, and commercial capital of India, Mumbai.

When the first COVID-19 case was discovered in Dharavi, it caused massive panic among the citizens as well as officials. Social distancing is virtually impossible to achieve in Dharavi, which is a maze of narrow congested lanes with tenements on either side of it and where 80% of the population use community toilets.

With their fingers crossed, people were speculating about Dharavi turning into a graveyard. These fears turned out to be misplaced and three months later Dharavi won praise from the WHO for effectively restricting the spread of coronavirus. According to the official data, the COVID-19 case doubling rate improved greatly, from 18 days in April, to 43 days in May, to 108 days in June, and 480 days in July.

Mr. Kiran Dighavkar, Assistant Commissioner of the top civic body of Mumbai, Brihanmumbai Municipal Corporation (BMC) said that their undertaking of an aggressive strategy of 4T’s - Tracing, Tracking, Testing & Treating, is the key to Dharavi’s successful fightback against the pandemic. The fightback plan was aptly coined "Mission Dharavi".

Extensive screening and testing of residents was done to detect the symptoms for coronavirus in "fever camp" which were set up by medical workers in different parts of the slum everyday. Many buildings such as schools, wedding halls, and sports complexes were overtaken by the civic authorities and were repurposed as quarantine facilities. A 200-bed hospital was also set up in record 14 days.

The BMC commissioner, I S Chahal said “Proactive screening helped in early detection, timely treatment and recovery.” Close to six hundred thousand people were screened, 14,000 people tested and 13,000 quarantined in nearby institutions, schools, marriage halls, and sports complexes. Furthermore, continuous monitoring of people’s movement using drones helped reinforce containment measures and scaled progress swiftly.

To further strengthen the measure, locals of the community emerged as “COVID Yodhas” (warriors) to address the concerns, a senior official said.  Many well endowed citizens and NGO’s provided Free meals, ration, PPE gear, oxygen cylinders, gloves, masks, medicines, and ventilators to residents and doctors.th July

On 8th July 2020 Dharavi recorded a total of 2,335 COVID-19 out of which 1,735 patients have recovered and there are only 352 active cases at present. Only 82 deaths were recorded in Dharavi till 8th July as against more than 4500 in the whole of Mumbai.

This phenomenal success has given the world a yet simple and effective technique in curbing the spread of the deadly virus. World Health Organization (WHO) chief Tedros Adhanom Ghebreyesus, in a virtual press conference in Geneva, acknowledging the efforts of various nations and Dharavi to contain the virus, said that “There are many examples from around the world that have shown that even if the outbreak is very intense, it can still be brought back under control”. Further, he added, “And some of these examples are Italy, Spain, and South Korea, and even in Dharavi -- a densely packed area in the megacity of Mumbai -- a strong focus on community engagement and the basics of testing, tracing, isolating and treating all those that are sick is key to breaking the chains of transmission and suppressing the virus.”

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