Continental drift – Gondwana – Alfred Wegener (Germany)

 

Alfred Wegener proposed the theory of continental drift – the idea that Earth’s continents move. Despite publishing a large body of compelling fossil and rock evidence for his theory between 1912 and 1929, it was rejected by most other scientists. It was only in the 1960s that continental drift finally became part of mainstream science.
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Alfred Wegener’s Scientific Legacy

Today, we recognize that continental drift theory is correct.

It was only in the 1960s, when the theory of plate tectonics was recognized as correct, that geologists finally accepted that Wegener’s continental drift theory and the concept of Pangaea were also correct. Wegener’s ideas are now standard concepts in geology, taught to everyone who studies the subject.

More about Afred Wegener

 

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Wegener was on his fourth scientific expedition to the Arctic and he was director of the Danish-Greenland polar research camp. He was much better known around the world for his northern exploration than for his relatively obscure ideas about drifting continents. In fact, the New York Times covered his departure at the start of Wegener’s last trip and charitably did not mention his drift theory at all in their lengthy science article.

Wegener’s fourth mission to Greenland included testing a new seismic method to measure the thickness of the icecap that covered the island. He believed it was much thicker than the assumed 3,600 feet previously measured.

Sending sound waves into the ice and timing their returning echoes with seismic equipment would give him a better estimate of the icecap’s thickness. The expedition also involved preparations to establish a permanent station that would gather continuous meteorological data. But food shortages, extremely cold weather, and unpredictable blizzards put outlying camps at risk.

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Alexander du Toit was a South African geologist who quickly accepted Wegener’s theory. Some consider Du Toit the greatest field geologist who ever lived. From 1903 to 1910, he travelled the whole of southern Africa on foot, ox cart, and bicycle with a mapping table slung over his shoulders.  In 1923, he was awarded a Carnegie Institute grant to travel to South America to test his thesis that rock formations that ended on the edge of Africa picked up precisely the same in Brazil. They do, convincing him that continents had once been joined and have drifted apart. Alexander du Toit wrote Our Wandering Continents in 1937 and dedicated the book to Wegener’s memory.

Wegener’s Death and Drift’s Hiatus

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Alfred Wegener’s Scientific Career

A first job and a world record
After completing his doctoral degree, Wegener started work in 1905 as a scientist at a meteorological station near the small German town of Beeskow.

There, working with his older brother Kurt, he carried out pioneering work using weather balloons to study air movements. If there had been a Guinness Book of World Records in 1906, the Wegener brothers would have won the record for the longest continuous balloon flight ever: 52.5 hours in April of that year.

Greenland

Wegener was delighted to be appointed as the official meteorologist for the   Danmark   scientific expedition to Greenland, the world’s largest island, which took place from 1906 to 1908. The expedition’s principle aim was to chart the coastline of Greenland’s unexplored northeast coast. During the expedition, Wegener made his mark by building Greenland’s first meteorological station and taking a large number of atmospheric readings using kites and balloons.

The expedition’s work in uncharted territory was dangerous – three expedition members died of starvation/exposure!

University Lecturer
Returning to Germany in 1908, Wegener became an associate professor in meteorology at the University of Marburg. There he quickly gained a reputation for giving lectures that made difficult topics easy for his students to understand.

In 1910 he published his first book: Thermodynamics of the Atmosphere. He also had the first inkling of the idea that would bring him both anguish and long-lasting fame: continental drift.

Continental Drift

Wegener looks at a map and sits up

Looking at a world map in 1910, Wegener noticed how the coastlines of eastern South America and western Africa seemed to fit together, rather like jigsaw pieces.

Publishing fossil and geological evidence

After further research, in 1911 Wegener learned that fossils of the same species were present in Brazil and western Africa. This evidence suggested to him that South America and Africa were in physical contact when the animals and plants that became fossils were alive.

He researched geological data and found evidence of similar rock formations on the two continents.

In 1912, age 32, Wegener gave talks at German universities and published two papers proposing that Earth’s continents moved. His work on continental drift was then interrupted by a second expedition to Greenland followed by the outbreak of World War 1 – Wegener was conscripted into the German Army.

Nevertheless, while recovering from a wound in 1915, he wrote and published his groundbreaking book: The Origin of Continents and Oceans, in which he discussed the movement of Earth’s continents.

He proposed that many millions of years ago Earth consisted of a single great continent surrounded by ocean. Very slowly the land masses of this huge continent moved apart to form the continents we see today. Unfortunately, nobody took much notice of his proposal!

Today we recognize that Wegener’s ancient continent truly existed. We call it by the name Wegener gave it – Pangaea.

More evidence and more book editions

In 1920, 1922, and 1929 Wegener published updated editions of The Origin of Continents and Oceans, adding more evidence each time for his idea that the continents move around the planet at very slow speeds. He also added further evidence he had gathered in Greenland that it had once been linked to North America.

He pointed out that he was not the first person to propose the movement of continents; others had also found evidence from fossils and rocks which strongly suggested continents now far apart were once joined; the American geologist Frank Bursley Taylor had published evidence in 1910 supporting the idea of continental drift.

Wegener’s work was independent of Taylors. In 1920s America, people referred to continental drift as the Taylor-Wegener theory.

Geologists Reject Wegener’s Ideas

Scientists who stray into another field can encounter difficulties, such as those encountered by physicist Luis Alvarez when he proposed a meteor impact had resulted in the extinction of the dinosaurs.

Wegener, an astronomer who had become a meteorologist, encountered vigorous resistance to his ideas from a large majority of geologists.

In compiling a huge volume of convincing evidence for Pangaea and continental drift he had made one or two small errors, and he also made one big error.

Although the rock and fossil evidence he reported should have been more than enough to convince skeptics that his theory was largely correct, Wegener tried to explain why continents move – and got this wrong!

Alfred Wegener

Polflucht

Polflucht is German for pole flight. Wegener proposed that there was a geological force which pushed the continents away from Earth’s poles towards the equator.

Geologists rightly told him this was untrue. Unfortunately they threw the baby out with the bathwater: they rejected Wegener’s truly compelling evidence for continental drift; and they also rejected work which today we recognize as a forerunner of the correct explanation of continental drift – plate tectonics, the idea that solid continents float on a fluid mantle.

The End

Wegener published what would be the final edition of his book The Origin of Continents and Oceans in 1929.

On an unknown day in mid-November 1930, Alfred Wegener died at the age of 50 on his fourth expedition to Greenland.

He had been trying to resupply a remote camp in very bad weather. Temperatures had dropped as low as a deadly -60 °C (-76 °F).

He supplied the camp successfully, but there was not enough food at the camp for him to stay there. He and a colleague, Rasmus Villumsen, took dog sleds to travel to another camp.

Wegener died on this journey, probably of a heart attack. Villumsen buried Wegener’s body in the snow and marked the grave with skis. Villumsen then resumed his journey, but did not complete it. His body was never found.

https://www.thoughtco.com/biography-of-alfred-wegener-1434996

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In May 1931 Kurt Wegener discovered his brother’s grave. He and other expedition members built a pyramid-shaped mausoleum in the ice and snow, and Alfred Wegener’s body was laid to rest in it. The mausoleum has now, with the passing of time, been buried under Greenland’s ice and snow.

Alfred Wegener was survived by his wife, Else Köppen, whom he had married in 1913, and two daughters: Sophie Käte and Lotte.

Alfred Wegener

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A brief introduction to Alfred Wegener’s theory of continental drift, which would lay the groundwork for the development of plate tectonic theory, which essentially explains the geology of the Earth.

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WHERE THE FAULT LIES, Segment Two: From The San Andreas to The Calaveras Fault with Brian Hackney

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National Geographic Naked Science Grand Canyon Full Movie

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Seismologists were stunned when a strike-slip fault triggered a M8.6..and just as surprised when it literally caused faults worldwide to fail. Seemingly dullish topic enlivened by the irreplaceable Ross Stein of (at the time) the US Geological Survey, and his exquisite ability to explain this unprecedented event. The cameo appearance of my dog (and very able seismic prop) Flossie no doubt tipped the balance in favor of this piece winning the Northern California Emmy for best same-day story. Incidentally, my co-anchor, Juliette Goodrich was nominated in the same category, and richly deserved a win. She has never liked me since.

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SOUTH AFRICA

KERKENBERG (MOUNTAIN)  KZN
Die berge – Retiefklip

 

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