Always wondered why the Flemish hills are so steep? Check out our recipe of how to make a Flemish hill #Geology #RondevanVlaanderen
youtu.be/Sq-AvUHGKf4?...
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Posts by Geology of the Tour de France
In case you wondered why GeoTdF is silent: we went incognito and trained to become pro. Today, we ended at nr 116 in Paris-Nice 😎 🦖
@teamvismaleaseabike.com @appysluijs.bsky.social
1 month ago
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Nolan, exactly the opposite actually. The resistant stuff is at the top (sandstones). The slopes are made of clay, and once erosion gets through the hard top, it’ll rapidly erode to make steep hill sides. And those get steeper by landslides.
1 month ago
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We certainly do!
youtu.be/Sq-AvUHGKf4?...
1 month ago
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Ik denk het!
6 months ago
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So today’s winner will have to dig deep for his win. But we advise not to dig too deep…
6 months ago
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Critical taper is the equilibrium angle of a wedge-shaped agglomeration of material that is bulldozed up (tectonically or otherwise). That angle depends among others on material properties, but piloshite makes slopes of up to 16%!
6 months ago
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There is no proper geological definition of the sediment association of the VAM subsurface, but among some geologists it is casually referred to as piloshite. Piloshite is an excellent material to explain 'critical taper theory' to students.
6 months ago
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It is rich in plasticite, contains iron accretions and abundant bituminous (i.e., organic material-rich) clasts, and may contain elevated heavy metal traces. There are plenty of ichnofossils (i.e., fossil footsteps) of giant caterpillars.
6 months ago
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Geologically, the Col du VAM deposits are best described as a sedimentary mélange, a poorly sorted, polymict (i.e., with elements of varied composition) and poorly stratified (i.e., layered) agglomerate.
6 months ago
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Those glaciers also bulldozered sand and gravel into hills, but the sediments that make the Col du VAM clearly 'unconformably' overlie the ice age deposits and must therefore be younger!
6 months ago
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The #TourofHolland gives us the opportunity to introduce the geologically most puzzling mountain of Europe: the Col du VAM!
The Dutch province of Drenthe is world-famous for Pleistocene ice age erratics: blocks of gneiss and granite that were transported from Sweden and Finland by giant glaciers.
6 months ago
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During the Holland Tour, the peloton will pass the Geulhemerberg! See @melanieduring.com's clip about the treasures hidden along the climb!
www.youtube.com/watch?v=ZkM7...
6 months ago
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And check out our 2-minute clip, with @vanhinsbergen.bsky.social about the Alblasserwaard's history, made last year for the Tour de France Femmes!
www.youtube.com/watch?v=IZSZ...
6 months ago
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The Holland Tour is racing through our backyard! See this blog we wrote last year about the geology of the Alblasserwaard, the scene of today's stage :)
And don't forget to listen to @josebeentv.bsky.social 's reporting at Eurosport!
www.geo-sports.org/2024/stage-2...
6 months ago
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So, some background for the start of @lavuelta.bsky.social…and oddly, the best way to do that is by telling you about the geology of Milano-San Remo 😃. The first days will be about the Po Plain and the Ligurian Alps! Enjoy!
www.geo-sports.org/2024/geology...
7 months ago
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We, too! 😎
7 months ago
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The Tour de France Femmes is climbing the Alps! Did you know the Alps are made of cheese?
@vanhinsbergen.bsky.social explains in this clip!
youtu.be/7wkFVQaMdo8?...
8 months ago
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And the Swiss Cheese that is the Basque subsurface, and that makes for all the steep climbs!
youtu.be/kCiXOFIMtZU?...
8 months ago
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Or the world-famous boundary between the Cretaceous and Tertiary - the end of the dinosaurs - exposed in Zumaia!
youtu.be/5yBTkUd3RWE?...
8 months ago
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The Classica San Sebastian will race along the Basque North Coast! @vanhinsbergen.bsky.social made some clips about the beautiful geological goodies of the Basque Country!
The trace fossils in the Black Flysch for instance!
youtu.be/BWGPKmuo6Zw?...
8 months ago
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The TdFF races through the Devonian of the northern Massif Central today. Marj and @vanhinsbergen.bsky.social imagined racing a Tour stage back then, 400 million years ago, in this ‘23 clip! 🐟
youtu.be/VFXoz3pSPec?...
8 months ago
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Ooh…I don’t know. And that is a problem 😃. If I figure it out, I’ll let you know!
8 months ago
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And why is the Jura such a strange, croissant-shaped mountain belt in front of the Alps? Marj will tell you!
youtu.be/CMeyN5AMGAU?...
8 months ago
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Racing through the Jura today! In ‘23 and ‘24 we made two clips about its geological wonders!
Like dinosaur footprints!
youtu.be/N7hmLLasZrk?...
8 months ago
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Clearly, geology raised its ugly head again - literally - to make the Ventoux. And its structure has funny ways in influencing the race 🤓🤠
8 months ago
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One more Pyrenees stage! And luckily, we have one more Pyrenees clip! How the deepest rocks end up on the highest peaks!
youtu.be/0t4EifLi-zU?...
9 months ago
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While watching the ride to the Pyrenees, it's always striking how abrupt the transition is from the flat lands of the Aquitaine basin to the steep mountain slopes. Two years ago, Marj Naudé explained where this sharp change comes from!
youtu.be/H7YIk3DnCug?...
9 months ago
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Pyrenees! Mine country!
Time for the 2024 story of Metal & Rock!
youtu.be/tImHaE0i9w4?...
9 months ago
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While riding over the Cantal volcano 🌋 - Europe’s largest, it’s time to tell the story how a volcanic eruption led to the invention of the bike!
@vanhinsbergen.bsky.social @uugeo.bsky.social
youtu.be/mLzFcPAZNAA?...
9 months ago
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