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26 April 2018 Photo Supplied
Pretzel-formed fossil of great evolutionary interest
Slab with holotype of Parapsammichnites pretzelifornic from the Urusis Formation, Namibia. Scale bar is 1cm.Picture was taken from Buatois et al., 2018.
The acclaimed scientific journal, Nature, recently published an article about a trace fossil in approximately 543-million-year-old rocks, which elucidates the evolution of the first animals that appeared on Earth and lived in the sea.  

Affiliated Professor in the Department of Geology at the University of the Free State (UFS) Prof Gerard Germs formed part of a team that conducted research with the aim of understanding how the evolution of the first multicellular animals came about and how the Cambrian explosion took place. Prof Germs is of great value to the team for his extended field geological knowledge.

An article which he co-authored was published in the Nature Scientific Reports. The title of the article is: “Sediment disturbance by Ediacaran bulldozers and the roots of the Cambrian explosion”. The international group of writers included authors from Canada, Spain and South Africa. 

Occurrence of the Cambrian explosion
Prof Germs explains the Cambrian explosion: “During the long (4.5-billion-year) history of the Earth, the first life originated and subsequently evolution of plants and animals took place from one-cellular organisms to multicellular vertebrate animals and seed plants. Approximately 573 million years ago the first multicellular animals appeared on the scene. Sometime afterwards, approximately 540 million years ago, a kind of explosion in the origin of many new animal species occurred. This explosion is known as the Cambrian explosion.”

The team studied Earth sediments which are somewhat older than the Cambrian explosion. Such sediments are approximately 573 to 541 million years old and form part of the Ediacaran (late Neoproterozoic) period.

“My discoveries of the past, of among others, the oldest animal with a carbonate skeleton (Cloudina) and of complex horizontal Cambrian-type “worm” tracks (treptichnids) in Ediacaran sediments of Namibia have demonstrated that the Cambrian explosion occurred more gradually than previously thought. This has recently been confirmed in the article that was published in the Nature Scientific Reports.”

Pretzeliformis bulldoze to search for food
According to the article there is evidence that   during the Ediacaran period   worm-like animals such as the Parasammichnites pretzeliformis were already so far developed that they, due to coelom development and size increase, for the first time in the history of the Earth, were able to disturb and bulldoze sediments.  In this way they were able to find a new food source in sea sediments. Bulldozing animals were previously thought to have originated only during and after the Cambrian explosion and not during the older Ediacaran.

“Another major aim of my cooperative research is to improve our knowledge of the geology of the Ediacaran to early Cambrian of South Africa and Namibia. We also intend to establish how the assembly of the supercontinent Gondwana took place. This improved knowledge can be of great future economic interest since large oil, gas and limestone sources occur in Ediacaran-age sediments outside South Africa”.

News Archive

Eusebius McKaiser talks about the magic of books
2013-03-19

 

Eusebius McKaiser
Photo: Johan Roux
19 March 2013

“If you want to turn around this country in terms of the rot in education, you have to start reading. You have to read for your degree."

This was the message from writer and political analyst, Eusebius McKaiser, at a public lecture hosted by the UFS Library and Information Services to celebrate South African Library Week.

Addressing the audience that consisted mostly of students, McKaiser, author of “A Bantu in my bathroom,” said it is not too late to start reading.

"We claim we are too busy as adults, but what is the opportunity cost of not reading? I think we lose our humanity, our sense of awe in the world around us when we stop reading as adults. Instead of saying we are too busy, we will do well to ask ourselves what is the cost of no longer reading as much as we did when we were children."

Reading from some of his favourite books, McKaiser spoke about writing techniques and the magic of books. He read excerpts from JM Coetzee's book “Disgrace,” which he considers to be the most important South African novel. He also read paragraphs from books by Rian Malan, James Baldwin and K Sello Duiker – calling the latter a genius.

Reflecting on the role of fiction, McKaiser said the genre is misunderstood and not utilised sufficiently by academics. "We see fiction as something restricted to the English Department or literary departments. I think fiction can be used as a tool in many departments in the humanities. It gives more real material for exploring complicated questions in the humanities and thought experiments that resemble life."

McKaiser also discussed the role of librarians and writers, saying writers should write what they like, but should not ignore the context. "As academics, librarians, teachers, we have to write for the context in which we teach. We have to order books for the context in which we are librarians and as academics we must not write textbooks for students who live in New York. We have to write textbooks for students who come from townships.”

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