#TectonicTuesday
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calamitaman.bsky.social
##tectonictuesday Just polishin' the good stuff

#geology ⚒️
A polished slab of mylonitic gabbro
November 4, 2025 at 12:10 PM
peterlbowden1.bsky.social
Attenuation of the limbs in these folds has left some of the fold hinges essentially floating.
#Laxfordian folding on the north west coast of the #IsleofLewis
#TectonicTuesday #Geology #Lewisian #Folding ⚒️🧪
September 10, 2024 at 11:39 AM
lapworthmuseum.bsky.social
Basalt is one of the most well-known and common igneous rocks. Did you know that basalt comprises more than 90% of volcanic rocks on Earth?

#LapworthRocks #TectonicTuesday #rocks #rock #igneous #tectonic #volcanic #volcano #basalt #museum #geology
July 8, 2025 at 9:00 AM
lapworthmuseum.bsky.social
What can we learn about the composition of our Earth? What are tectonic plates? Find out in our learning sessions, available for primary and secondary schools: ow.ly/UPi350WBbc3

#TectonicTuesday #LapworthRocks #learning #schools #geology
Teaching and Learning at the Lapworth Museum - University of Birmingham
From diamonds to dinosaurs, we support all ages.
ow.ly
August 12, 2025 at 9:00 AM
lapworthmuseum.bsky.social
Fun fact: The Earth's tectonic plates move about as fast as your fingernails grow!
Another fact: Ben Miller once told jokes next to a lava lake!

Now he’s bringing his stand-up show Volcano to Birmingham on Fri 12 Sept. Join us for a lively night out!

lapworth-comedy.even...

#TectonicTuesday
July 22, 2025 at 9:00 AM
lapworthmuseum.bsky.social
This lantern slide shows a photograph by Tempest Anderson! Can you guess which active Italian #volcano is captured here? It famously erupted in 79 AD, burying nearby towns such as Pompeii and Herculaneum with #ash and #pyroclastic flows.

#TectonicTuesday #LapworthRocks #igneous #geology #museum
June 17, 2025 at 9:00 AM
lapworthmuseum.bsky.social
This breadcrust bomb comes from Mount St Helens, U.S, and forms in the same way a #volcanic bomb does, but gets its name from the characteristic cracked surface! This results from the outer surface cooling down and then cracking when gas bubbles expand from its hot interior.

#TectonicTuesday
May 27, 2025 at 9:00 AM
rapiduplift.bsky.social
Rootless folds in footwall dolomite of the Munsiyari thrust.

This thrust places Paleoproterozoic gneiss over Neoproterozoic metasedimentary Lesser Himalaya. Considered to be the floor thrust of the Main Central Thrust zone.

Loc: Road from Munisiyari baazar to petrol pump.

#TectonicTuesday
Tiny rootless fold in dolomite. Picture is of a hand sample. Rock is grey to earthy in color. It is an accentuated streaky appearance. Deformation in the footwall of Munisiyari Thrust which places Paleoproterozoic gneiss over Neoproterozoic Lesser Himalaya. Location. Munsiyari town baazaar road towards petrol pump, Uttarakhand, India. Outcrop view of pale yellow dolomite showing rootless folds. Rock is from the footwall of Munsiyari Thrust, which places Paleoproterozoic gneiss over Neoproterozoic Lesser Himalaya. Location. Munsiyari bazaar road to petrol pump. Uttarakhand, India.
February 18, 2025 at 10:18 AM
sedgwickmuseum.bsky.social
Did you know that, under the right conditions, rocks can bend?
 
For today’s #TectonicTuesday, here are some folds in banded amphibolite found in Norway.

Studying the geometry of folds can help us understand the deformation history of rocks.
 
#TectonicTuesday #SedgwickMuseum #EarthSciences
A folded amphibolite being held up in front of a wall of 13 other rocks. The amphibolite is grey with darker grey bands in it. The bands are folded in an undulating way. The rock wall behind is brown in colour and there is an array of rocks displayed. Some are folded and others are fractured.
March 25, 2025 at 11:28 AM
lapworthmuseum.bsky.social
Where do volcanic bombs get their shape from? They become rounded due to cooling and solidifying mid-air after they are ejected from the volcano during an eruption.

Image by Greg Milner.

#LapworthRocks #TectonicTuesday #volcano #volcanic #tectonic #rocks #rock #geology #museum
October 7, 2025 at 9:00 AM
lapworthmuseum.bsky.social
Lapworth's Lava Chicken, yeah, it's tasty as hell! 🎶

#TectonicTuesday #LapworthRocks #geologyrocks #geology #igneous #metamorphic #volcano #tectonic #bird #museum #Minecraft #MinecraftMovie
May 6, 2025 at 9:00 AM
sedgwickmuseum.bsky.social
What’s the story behind this fascinating rock?

It is laminated layers of shales and jaspers found in North West Queensland, Australia, formed 500 million years ago. These colourful layers do not align because they have been faulted (fractured and displaced).

#TectonicTuesday #Faulting #Geology
A museum staff member holding the rock up in front of a wall of 13 other rocks. The specific specimen is a deep/purple colour with fine layers of red/orange colour too. The layers are displaced. A close up of the rock where you can see the layers in more detail. They are extremely fine , hence the term 'laminated' is used.
February 4, 2025 at 12:09 PM
sedgwickmuseum.bsky.social
Ever wondered what happens to rocks under pressure? 🪨

Deformation is the change rocks undergo when force (known as stress) is applied to them. Factors like the rate of stress, temperature, and pressure influence the type of deformation that occurs.

#TectonicTuesday #RockDeformation #Geology
A wall of thirteen rocks showing various different types of deformation. You can see folding, bending and fracturing.
January 28, 2025 at 2:00 PM
rapiduplift.bsky.social
The Greater Himalaya is a northerly dipping homoclinal medium to high grade metamorphic slab.

Examples from the Kumaon Himalaya.

#TectonicTuesday
View of regional northerly dips of Greater Himalaya Sequence from Khati village, entrance to Sunderdunga and Pindari valley, Kumaon. View of regional northerly dips of Greater Himalaya Sequence from Baaling village, Darma Valley, Kumaon. View of regional northerly dips of Greater Himalaya Sequence, from near Bawaldhar, entrance to Johar valley and Milam Glacier. Kumaon. A close up of thinly bedded northerly dipping high grade metamorphic rocks of the Greater Himalaya Sequence in Sunderdunga valley, Kumaon.
December 17, 2024 at 11:19 AM
lapworthmuseum.bsky.social
Rhyolite is an extrusive #igneous rock formed when a silica-rich #magma is pushed out of a #volcanic vent and quickly cools on the planet's surface!

Explore this model at https://skfb.ly/ov7UF

#TectonicTuesday #LapworthRocks #geologyrocks #geology #metamorphic #volcano #tectonic #museum
Banded Rhyolite - Teaching Collection - Download Free 3D model by Lapworth Museum of Geology (@LapworthMuseum)
Banded Rhyolite (Igneous Extrusive): This rock is from a silica-rich lava flow. The banding in the rock shows the movement of the lava. Rhyolite lava is very viscous (sticky) and flows slowly. - Banded Rhyolite - Teaching Collection - Download Free 3D model by Lapworth Museum of Geology (@LapworthMuseum)
skfb.ly
April 15, 2025 at 9:00 AM