GeoLog

Stratigraphy, Sedimentology and Palaeontology

Imaggeo on Mondays: A slice of fossil life

Imaggeo on Mondays: A slice of fossil life

I am a petrographer at the University of Padova, Italy, studying the metamorphic rocks that form the deep Earth’s crust beneath our feet, and what happens when they get so hot to start to melt.

I’ve spent (enjoyed I should say) more than 30 years looking at rocks with an optical microscope. This simple, cheap tool, and more importantly, its skilled use, remain key ingredients for good research in petrology!

I’ve been taught by scientists, like Ron Vernon of Macquarie University in Australia, that a good micrograph is essential to document my research and strengthen my conclusions, and so I’ve always paid particular attention to the quality of photos. In the meanwhile, I have also developed a particular interest in photomicroscopy with an aesthetic purpose, realizing that the cocktail of rocks and polarized light has an extraordinary potential in the ‘sciart’ (Science-and-Art) field.

The digital revolution has marked a turning point in this activity, and 10 years ago I have started my micROCKScopica project to showcase to the public the beauty hidden in the small slices of rock that are thin sections.

When I find a photogenic rock I play with polarizers to get the desired combinations of color, and then I take a photograph. And people can enjoy the images, their colors and shapes, even without knowing the geological history behind them.

This is particularly true for this photograph: it is a thin section of a piece of dinosaur bone but I don’t know much about it (what bone, which dinosaur), only that it had been collected in Utah, in the United States. I received a small sample of the bone by Denise M. Harrison, a friend with whom I collaborated for a book on Lake Superior Agates. She is an award-winning lapidary (someone who cuts, polishes and engraves stones), and makes lovely cabochons with all sort of semiprecious, hard stones. I asked her for some leftovers to make some thin sections, because I wanted to see something new, possibly silicified (impregnated with silica during fossilization) because chalcedony – the very fine-grained variety of common quartz – may be extremely photogenic.

I had no idea of how a bone could look like under the microscope, and the first sight left me speechless! The porous structure, and the patterns of the radiating textures in the chalcedony fillings are extraordinary, and provide a wealth of possibilities for nice images.

In this shot, that I replicated in red and blue, a larger hole had been filled with a fine-grained quartz sand – the dark moon shape on top left – somehow interrupting the regular pattern of the bone tissue, that to someone may recall Australian Aboriginal artwork.

Curiously, this anatomically-related image made me quite popular among pathologists and other medical doctors, who find many analogies with their subjects of research. The ages of the specimens are some hundred million years apart, though…

By Bernardo Cesare, University of Padova, Italy

www.microckscopica.org

Editor’s note: The fossil sample featured in this photo was collected and distributed legally from Utah.

If you pre-register for the 2019 General Assembly (Vienna, 07–12 April), you can take part in our annual photo competition! From 15 January until 15 February, every participant pre-registered for the General Assembly can submit up three original photos and one moving image related to the Earth, planetary, and space sciences in competition for free registration to next year’s General Assembly!  These can include fantastic field photos, a stunning shot of your favourite thin section, what you’ve captured out on holiday or under the electron microscope – if it’s geoscientific, it fits the bill. Find out more about how to take part at http://imaggeo.egu.eu/photo-contest/information/.

Imaggeo is the EGU’s online open access geosciences image repository. All geoscientists (and others) can submit their photographs and videos to this repository and, since it is open access, these images can be used for free by scientists for their presentations or publications, by educators and the general public, and some images can even be used freely for commercial purposes. Photographers also retain full rights of use, as Imaggeo images are licensed and distributed by the EGU under a Creative Commons licence. Submit your photos at http://imaggeo.egu.eu/upload/.

Winners of the EGU Best Blog Posts of 2018 Competition

Winners of the EGU Best Blog Posts of 2018 Competition

There is no doubt that 2018 was packed full of exciting, insightful and informative blog posts. An impressive 382 posts were published across the EGU’s official blog, GeoLog, as well as the network and division blogs!

In December, to celebrate the excellent display of science writing across the network and division blogs, we launched the EGU Blogs competition. From a list of posts selected by our blog editors, we invited you, the EGU Blogs readers, to vote for your favourite post of 2018. We also invited EGU division blog editors and office staff to take part in a panel vote. After more than two weeks of voting, the winners are finally in!

Without further ado, we’d like to extend a big congratulations to the Geodynamics (GD) Division Blog, winner of the public vote, and the Geology for Global Development (GfGD) Blog, winner of the panel vote!

The GD division blog was crowned winner of this year’s public vote for their post on the Global Young Scientists Summit (GYSS) in Singapore! Follow blog contributor Luca Dal Zilio’s experience attending this gathering of over 250 PhD and postdoctoral fellows!

The GfGD blog snagged first place in the panel vote with their post: The Case Against Fieldwork – How can we internalise the carbon cost of fieldwork, as scientists who investigate the earth system? Read blog contributor Robert Emberson’s analysis and personal experience with the carbon footprint of working in the field!

All the posts entered into the competition are worthy of a read too, so head over to the poll and click on the post titles to learn about a variety of topics: from social media responses to geomagnetic activity, to exploring what artificial intelligence can do for climate science and watching socio-hydrology on Broadway.

If the start of a new year, with its inevitable resolutions, along with the range and breadth of posts across the EGU Blogs have inspired you to try your hand at a little science writing then remember all the EGU Blogs welcome (and encourage!) guest posts. Indeed, it is the variety of guest posts, in addition to regular features, which makes the blogs a great read! If you would like to contribute to any of the network, division blogs or GeoLog, please send a short paragraph detailing your idea to the EGU Communications Officer, Olivia Trani at networking@egu.eu.

GeoTalk: Alena Ebinghaus, Early Career Scientist Representative

GeoTalk: Alena Ebinghaus, Early Career Scientist Representative

In addition to the usual GeoTalk interviews, were we highlight the work and achievements of early career scientists, this month we’ll also introduce one of the (outgoing) Division early career scientist representatives (ECS). The representatives are responsible for ensuring that the voice of EGU ECS membership is heard. From organising short courses during the General Assembly, through to running division blogs and attending regular ECS representative meetings, their tasks in this role are varied. Their work is entirely voluntary and they are all active members of their research community, so we’ll also be touching on their scientific work during the interview.

Today we are talking to Alena Ebinghaus, ECS representative for the Stratigraphy, Sedimentology and Palaeontology (SSP) Division. Alena has been in post for more than 20 months, but her term comes to an end at the 2019 General Assembly. Interested in getting involved with EGU and its activities for early career scientists? Consider applying for one of the vacant representative positions

Before we get stuck in, could you introduce yourself and tell us a little more about yourself and your career?

I was fascinated by geology long before I started studying, and it was volcanoes that got me hooked initially. Being originally from Hagen in Germany, I went to study geology and palaeontology at the Rheinische Friedrich-Wilhelms Universität in Bonn, from which I obtained a Diploma (=MSc) degree in 2010. I continued with a PhD at the University of Aberdeen, in the UK, where I focused my research to inter-lava drainage and plant ecosystems in the Columbia River Flood Basalt Province (USA). I haven’t settled my studies in volcanology after all, but sedimentological and palynological (largely pollen and spores) studies set in a volcanic environment was the perfect balance for me.

I am still based in Aberdeen, and since 2014 employed as a postdoctoral researcher. Now my main research projects are the assessment of sedimentary and plant ecological response patterns to rapid climate change of the past. I look at sedimentary rock records from the Cretaceous–Paleogene  Boltysh meteorite impact crater (Ukraine) and the Palaeocene–Eocene Bighorn Basin (Wyoming). These two locations were witness to rapid warming events and hold geological clues to how the environment responded to these changes.

Alena at the Palouse Falls, Washington State. (Credit: Lucas Rossetti)

Although we touch upon it in the introduction of this post: what does your role as ECS representative involve?

The ECS representative is the anchor point between the early career researchers and later career researchers. Within the SSP community I communicate the matters and interests of the ECS to the SSP division and the wider EGU community, and help to connect the work and engagements of early stage scientists with those of a later career stage. With the help of a small group of other ECS, I coordinate and take care of the SSP social media Facebook and Twitter accounts. I also try to set up social events and help organize short courses during the annual General Assembly (GA). In the particular case of the SSP division, I have coordinated the set-up of the division’s weblog.

Why did you put yourself forward for the role?

I was keen to get involved and integrate with the SSP community and the EGU in order to widen my academic network and to become a more interactive GA participant. The GA is a large conference – I wanted to have the opportunity to meet a lot of people and help organize events rather than being a somewhat passive attendant.

What is your vision for the Stratigraphy, Sedimentology and Palaeontology Division ECS community and what do you hope to achieve in the time you hold the position?

I see the SSP growing further and particularly the ECS community becoming more inter-active with organizing SSP-specific scientific and social events similar to some of the larger divisions within the EGU. The first couple of times I joined the GA I felt rather lost, and was not quite aware of ECS work, nor did I meet other SSP ECS. Bringing the SSP ECS community together and making their engagements more visible so to better approach other ECS is one of main objectives.

What can your ECS Division members expect from the Stratigraphy, Sedimentology and Palaeontology Division in the 2019 General Assembly?

First of all, the SSP division again offers again a great range of scientific sessions, but I am also planning a couple of social get-togethers which shall be particularly interesting for those attending the GA for the first time. As every year, there will be the opportunity to meet the SSP president and to join the division’s meeting which is open to all SSP members. With a group of other academics, I will be convening a short course to discuss the balance of work and personal life in science – a topic addressed to researchers of all career stages within SSP and naturally beyond.

How can those wanting to, get involved with the EGU?

For everyone being interested in SSP work, it would be best to either get in touch with myself, via email or Facebook or the SSP president. We will be more than happy to assist and answer any questions.

Interview by Olivia Trani, EGU Communications Officer

Imaggeo on Mondays: The best of imaggeo in 2018

Imaggeo on Mondays: The best of imaggeo in 2018

Imaggeo, our open access image repository, is packed with beautiful images showcasing the best of the Earth, space and planetary sciences. Throughout the year we use the photographs submitted to the repository to illustrate our social media and blog posts.

For the past few years we’ve celebrated the end of the year by rounding-up some of the best Imaggeo images. But it’s no easy task to pick which of the featured images are the best! Instead, we turned the job over to you!  We compiled a Facebook album which included all the images we’ve used  as header images across our social media channels and on Imaggeo on Mondays blog post in 2018 an asked you to vote for your favourites.

Today’s blog post rounds-up the best 12 images of Imaggeo in 2018, as chosen by you, our readers.

Of course, these are only a few of the very special images we highlighted in 2018, but take a look at our image repository, Imaggeo, for many other spectacular geo-themed pictures, including the winning images of the 2018 Photo Contest. The competition will be running again this year, so if you’ve got a flair for photography or have managed to capture a unique field work moment, consider uploading your images to Imaggeo and entering the 2019 Photo Competition.

A view of the southern edge of the Ladebakte mountain in the Sarek national park in north Sweden. At this place the rivers Rahpajaka and Sarvesjaka meet to form the biggest river of the Sarek national park, the Rahpaädno. The rivers are fed by glaciers and carry a lot of rock material which lead to a distinct sedimentation and a fascinating river delta for which the Sarek park laying west of the Kungsleden hiking trail is famous.

 

Melt ponds. Credit: Michael Tjernström (distributed via imaggeo.egu.eu)

The February 2018 header image used across our social media channels. The photos features ponds of melted snow on top of sea ice in summer. The photo was taken from the Swedish icebreaker Oden during the “Arctic Summer Cloud Ocean Study” in 2008 as part of the International Polar Year.

 

Karstification in Chabahar Beach, IRAN. Credit: Reza Derakhshani (distributed via imaggeo.egu.eu)

The June 2018 header image used for our social media channels. The photo was taken on the Northern coast of the Oman Sea, where the subduction of Oman’s oceanic plate under the continental plate of Iran is taking place.

 

River in a Charoite Schist. Credit: Bernardo Cesare (distributed via imaggeo.egu.eu)

A polarized light photomicrograph of a thin section of a charoite-bearing schist. Charoite is a rare silicate found only at one location in Yakutia, Russia. For its beautiful and uncommon purple color it is used as a semi-precious stone in jewelry.

Under the microscope charoite-bearing rocks give an overall feeling of movement, with charoite forming fibrous mats that swirl and fold as a result of deformation during metamorphism. It may be difficult to conceive, but these microstructures tell us that solid rocks can flow!

 

Refuge in a cloudscape. Credit: Julien Seguinot (distributed via imaggeo.egu.eu)

The action of glaciers combined with the structure of the rock to form this little platform, probably once a small lake enclosed between a moraine at the mountain side and the ice in the valley.

Now it has become a green haven in the mountain landscape, a perfect place for an alp. In the Alps, stratus clouds opening up on autumn mornings often create gorgeous light display.

 

Antarctic Fur Seal and columnar basalt Credit: Etienne Pauthenet (distributed via imaggeo.egu.eu).

This female fur seal is sitting on hexagonal columns of basalt rock, that can be found in Pointe Suzanne at the extreme East of the Kerguelen Islands, near Antarctica. This photo was the November 2018 header image for our social media channels.

 

Silent swamp predator. Credit: Nikita Churilin (distributed via imaggeo.egu.eu).

A macro shot of a Drosera rotundifolia modified sundew leaf waiting for an insect at swamp Krugloe. This photo was the January 2018 header image and one of the finalists in the 2017 Imaggeo Photo Competition.

 

Once there was a road…the clay wall. Credit: Chiara Arrighi (distributed via imaggeo.egu.eu)

The badlands valley of Civita di Bagnoregio is a hidden natural gem in the province of Viterbo, Italy, just 100 kilometres from Rome. Pictured here is the ‘wall,’ one of the valley’s most peculiar features, where you can even find the wooden structural remains of a trail used for agricultural purposes in the 19th and 20th centuries.

 

New life on ancient rock. Credit: Gerrit de Rooij (distributed via imaggeo.egu.eu).

“After two days of canooing in the rain on lake Juvuln in the westen part of the middle of Sweden, the weather finally improved in the evening, just before we reached the small, unnamed, uninhabited but blueberry-rich island on which this picture was taken. The wind was nearly gone, and the ragged clouds were the remainder of the heavier daytime cloud cover,” said Gerrit de Rooij, who took this photograph and provided some information about the picture, which features some of the oldest rocks in the world but is bursting with new life, in this blog post.

 

Cordillera de la Sal. Credit: Martin Mergili (distributed via imaggeo.egu.eu)

The photograph shows the Valle de la Luna, part of the amazing Cordillera de la Sal mountain range in northern Chile. Rising only 200 metres above the basin of the Salar de Atacama salt flat, the ridges of the Cordillera de la Sal represent a strongly folded sequence of clastic sediments and evapourites (salt can be seen in the left portion of the image), with interspersed volcanic material.

 

Robberg Peninsula – a home of seals. Credit: Elizaveta Kovaleva (distributed via imaggeo.egu.eu).

“This picture is taken from the Robberg Peninsula, one of the most beautiful places, and definitely one of my favorite places in South Africa. The Peninsula forms the Robberg Nature Reserve and is situated close to the Plettenberg Bay on the picturesque Garden Route. “Rob” in Dutch means “seal”, so the name of the Peninsula is translated as “the seal mountain”. This name was given to the landmark by the early Dutch mariners, who observed large colonies of these noisy and restless animals on the rocky cliffs of the Peninsula,” said Elizaveta Kovaleva in this blog post.

 

The great jump of the Tequendama. Credit: Maria Cristina Arenas Bautista (distributed via imaggeo.egu.eu)

Tequendama fall is a natural waterfall of Colombia. This blog post highlights a Colombian myth about the origins of the waterfall, which is tied to a real climate event.

 

If you pre-register for the 2019 General Assembly (Vienna, 07 – 12 April), you can take part in our annual photo competition! From 15 January up until 15 February, every participant pre-registered for the General Assembly can submit up three original photos and one moving image related to the Earth, planetary, and space sciences in competition for free registration to next year’s General Assembly!  These can include fantastic field photos, a stunning shot of your favourite thin section, what you’ve captured out on holiday or under the electron microscope – if it’s geoscientific, it fits the bill. Find out more about how to take part at http://imaggeo.egu.eu/photo-contest/information/.