145 million years ago Scandinavia was hit by a tsunami, probably more intense than the one that hit Southeastern Asia in December 2004. Traces of this ancient tsunami are still left and these have been discovered by the geologists Vivi Vajda and Jane Wigforss-Lange at Lund University. The scientific results will soon be published in the journal Progress in Natural Science.
The site is located at Eriksdal, in the southernmost province of Sweden, Skåne. Scandinavia and the Baltic formed a continent 145 million years ago, around the Jurassic-Cretaceous transition. The coast line cut through Skåne and the area around Eriksdal was a delta environment. At this time Sweden was situated at the same latitude as the Mediterranean of today and the climate was globally warm, not even the poles were ice capped. In Scandinavia tree ferns, gingkoes and cycads were thriving and the fauna was dominated by dinosaurs. The coast was inhabited by sharks, crocodiles and tetrapods (now extinct giant amphibians).
The 30 metre thick section in Eriksdal is hid in a farmland and can only be accessed by extensive digging and the sediments are tilted so the layers are vertical. In the sediments we found fossils of fish, mussels, snails mixed with landplants, says Vivi Vajda. We first interpreted these beds as storm deposits but microscopical samples revealed a total mix of pollen, plant fragments and fungal spores both within the shellbed and just above, signs that indicate that material from land was transported by the same wave as the one causing the accumulation of the shell bed. Besides, the mussels and the snails were extremely well preserved indicating a single depositional event and not a storm, which would have left the shells broken and eroded. We started to suspect that a tsunami had hit the area but we didn’t have enough evidence at the time to put the theory forward.
Göran Frankel | alfa
A close-up look at an uncommon underwater eruption
11.01.2018 | Woods Hole Oceanographic Institution
Environmental history told by sludge: Global warming lets the dead zones in the Black Sea grow
10.01.2018 | Leibniz-Institut für Ostseeforschung Warnemünde
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
16.01.2018 | Materials Sciences
16.01.2018 | Life Sciences
16.01.2018 | Health and Medicine