The movements of plate tectonics become particularly clear on maps showing the age of the oceanic crust.
Which countries have the most volcanoes? I am currently learning the programming language Python, mainly to visualise data and draw maps. Since the examples in the tutorials were too boring for me, I have taken on more interesting questions. An interesting dataset is the list of active volcanoes (i.e. at least 1 eruption in the … Continue reading “Volcanoes per Country”
Walks along the channels and ponds once created for mining in the Harz Mountains
Probably the (historically) most important outcrop of geology is located on the coast about 40 miles east of Edinburgh. In 1788, at a time when geology did not yet exist as an independent science and hardly anyone doubted the common teaching that the earth — according to the creation story in the Bible — was … Continue reading “Unconformity at Siccar Point”
Hike to the Hidden Valley in the former Caldera (Scotland)
Spectacular sinkholes for diving, snorkelling, swimming (Mexico)
A day hike combines the impressive rock arch in the Elbe Sandstone Mountains with a boat trip through the Edmundsklamm gorge.
It is no coincidence that the limestone towers in Upper Franconia are reminiscent of famous landscapes in Southeast Asia.
Like little boats, strangely shaped salt crystals sometimes float on salt lakes or in saltworks: hopper halite or fleur de sel.
At perhaps the most spectacular waterfalls on earth (Argentina/Brazil)
“Symphony of Stones”: Spectacular but relatively unknown basalt columns in Azad Canyon
Volcano with obsidian lava and lakes in Eastern Anatolia, Turkey
Spectacular hypersaline crater lake (maar) with a cinder cone in the centre (Central Anatolia, Turkey)
Shallow water as far as the eye can see and a reddish colour due to halobacteria — the Great Salt Lake in Central Anatolia (Turkey)
The “Stone Forest” in Bulgaria
Deeply incised meanders of the Uvac in a rarely visited reserve in Serbia
Large sinkholes near Imotski in Croatia
Karstified mountains in Croatia
Karst landscape with lakes and waterfalls in Croatia
Bizarre karst formation in Croatia
Many of the deep lakes in the Alps are known to fill valleys that were once carved out by the glaciers of the ice ages. However, this is not the case with the lakes in the Southern Alps. Where Lake Como, Lake Lugano, Lake Garda and Lake Maggiore are located today, there were already deep … Continue reading “Lake Como”
Hikes to Cuilin Mountains and Old Man of Storr
Hiking in the mountains of Scotland
Seastacks and stone circles on the islands in the north of Scotland
Nature on the Mediterranean coast of Andalusia (Spain)
Since I don’t have any recent photos to show, here is a picture of a rock sample that has been lying around in my room for a long time. It is one of my favourite samples because I can torture every geoscientist who visits me with the question of what he sees here. Two different … Continue reading “A sample of the Moho”
Old mine in the huge SEDEX deposit in the Harz Mountains
Petrified trunks of Cretaceous palms and conifers in the Patagonian steppe (Argentina)
Footprints of reptiles in the Southern Alps (Trentino, Italy)
Chalk cliffs in Jasmund National Park
The GR 131 hiking trail on La Palma combines the Ruta de los Volcanes with the Ruta de la Cresteria for a four-day hike, an island crossing that is scenically and geologically spectacular (Canary Islands, Spain)
The most beautiful way to climb Teide is to traverse Montaña Blanca, Teide and Pico Viejo with an overnight stay at the Refugio de Altavista
It was about time that I paid a visit to the Canary Islands. After all, Teide is the highest hotspot volcano after Hawaii’s and much quicker to reach… However, there are also a few important differences to Hawaii, for example, a stratovolcano like Teide is not exactly typical of a hotspot, nor are the large … Continue reading “Tenerife”
Valle Gran Rey, Garajonay and Roque de Ojila (Canary Islands, Spain)
Hike to the most beautiful folds of the Alps, which not only gives insights into the geology of the mountains (folds, overthrusts, nappes), but also beautiful views of the mountains.
Short geological excursion in Switzerland
The “crater” Ramon in the Negev Desert in Israel was not formed by a meteorite impact, but by erosion of a fold
Instead of glowing lava, cool mud and natural gas emerge from mud volcanoes. This phenomenon can be observed in regions where clay quickly reaches great depths.
Photos of selected samples from the agpaitic intrusion in Greenland
A journey to ice and tugtupite
Expedition to an intrusion with alkaline rocks (syenites, carbonatites, pyroxenites, etc.) in the High Atlas
Surreal landscape in Hunan (China)
The rocks of the Zermatt-Saas zone are an ophiolite, i.e. originally oceanic lithosphere (of the Penninic Ocean, the deep-sea basin of the Alpine Tethys). However, the unit is highly deformed, so that the normal sequence of serpentinite (mantle), gabbro, basalt and sediments cannot be found in one piece. Furthermore, they were metamorphosed (eclogite facies, retrograde … Continue reading “Zermatt-Saas Ophiolite (excursion)”
Fieldwork for my diploma thesis at the World’s only active carbonatite volcano
More than 2 m of pumice was deposited on the first day of the 79 AD eruption of Vesuvius. The weight caused roofs of buildings to collapse, but people died in the pyroclastic flows (surges) that came down the mountain towards the end of the eruption. A caldera formed during the eruption, and Mt. Somma … Continue reading “Excursion: Volcanism Southern Italy”
Geological excursion: explosive volcanism in the Mediterranean (Greece)