How to measure strike & dip in the field ? 🪨🧭
Strike is the direction of the horizontal line on a rock surface, while dip is the angle at which the layer slopes downward from horizontal.
👉 Measuring strike:
Place your compass flat against the rock surface and rotate it until the bubble level is centered. The direction indicated by the needle gives you the strike.
👉 Measuring dip:
Turn the compass perpendicular to the strike, then use the clinometer to measure the steepest angle downward. That angle is your dip.
💡 Remember: dip is always perpendicular to strike, and together they define the orientation of any geological plane.
🔗 Source: geolstuffmnl.com
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STOP IGNORING GEOLOGY
CULOI l = 16 MARKS
Earth Layers in 5 Minutes
📝 Description
Most students ignore Geology thinking it's just a theory subject. But in reality, this subject can help you score 8–16 marks easily every year.
The real problem is not studying — it's forgetting during exams.
. In this video, you will learn:
. What Geology actually means
. Why it is important for Civil Engineers
. Interior Layers of Earth in the simplest way
. A powerful memory trick (CULOI) to remember all
layers
We will break down each layer — Crust, Mantle, and Core — in a very simple and exam-oriented way so that you can write answers confidently without confusion.
If you want to score better with less stress, this topic is a must.
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An angular unconformity is a contact between two sequences of rock layers where the lower layers were tilted or folded before the upper layers were deposited.
It represents a gap in the geological record (called a hiatus), that includes a period of tectonic deformation, uplift, and erosion before renewed sedimentation.
The angle between the two sequences is what makes it "angular."
One of the most famous examples is Siccar Point in Scotland, where James Hutton first grasped the concept of deep time in 1788 upon seeing Silurian greywackes truncated by Devonian red sandstones.
Video credits: modified from Geology in a Jiffy
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PGC-I : Interesting facts.
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Geological maps provide key information: the types of rocks, their ages, how they are layered, and structural features like faults and folds.
A cross section is a vertical “slice” along a chosen line on the map that shows how these layers extend underground. To create one, you pick a line of section, project the layers and structures from the map onto it, and visualize the 3D arrangement.
Mastering this helps geologists understand subsurface geology for research, exploration, or teaching.
#Geology #GeologicalMap #CrossSection #EarthScience #Fieldwork
Rock vs Minerals | What’s the Real Difference? | Geology Explained | Duelify TV
Witness the ultimate comparison between rocks and minerals — two fundamental concepts in geology and earth science. Many people use these terms interchangeably, but they are not the same!
In this Reels video, you’ll discover:
Definition of rocks and minerals
Natural formation processes
Chemical composition differences
Examples like granite, quartz, and basalt
Role in earth’s crust and geology
Why every rock contains minerals
Whether you’re a geology student, civil engineering learner, or simply curious about earth science, this comparison will help you understand the real difference instantly!
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Scientists have discovered a massive reservoir of water hidden deep inside Earth’s mantle, hundreds of kilometers beneath the surface. This water is not flowing like oceans or rivers. Instead, it is locked within a rare mineral called ringwoodite, which forms under extreme pressure far below Earth’s crust. Researchers believe the amount of water stored in this deep layer could equal or even exceed three times the volume of all oceans on the surface.
This finding has significantly changed how scientists think about Earth’s water cycle. Rather than existing only on the surface in seas, rivers, and ice, water may also circulate slowly through deep geological layers over millions of years. Such hidden reservoirs could influence volcanic activity, plate tectonics, and the long-term behavior of Earth’s interior.
The discovery also highlights how much of our planet remains unexplored beneath our feet. By studying minerals like ringwoodite carried upward through volcanic rocks, researchers are uncovering new clues about Earth’s deep structure and the complex systems that shape the surface environment where life exists.
Sources: Northwestern University Earth Sciences Research; Nature Geoscience; U.S. Geological Survey (USGS).
A stable craton is the ancient, strong core of a continent, a part of Earth’s crust that has stayed mostly unchanged for billions of years while surrounding areas experienced earthquakes, folding, and mountain building.
It is so stable because its lithosphere is thick, rigid, and cold, making it resistant to the tectonic forces that deform younger crust.
The map in the reel shows the global distribution of cratons.
Source: all‑geo.org/metageologist/2012/12/cratons‑old‑and‑strong/
#stablecraton #geology #earthscience #tectonics #ancientcrust
The Geologic Time Scale (GTS) is the international "calendar" used to divide Earth’s 4.6-billion-year history into hierarchical units based on significant rock layers and fossil evidence.
These subdivisions, from largest to smallest, are:
1- Eons: The largest spans (e.g., the current Phanerozoic).
2- Eras: Major stages of life (e.g., Mesozoic, the age of reptiles).
3- Periods: Systems of rock and life (e.g., Jurassic).
4- Epochs: Finer divisions of periods (e.g., Pleistocene, the ice ages).
5- Ages: The shortest, most specific snapshots of time.
Changes between these units are typically marked by mass extinctions or significant geological shifts.
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Full Video available on Youtube. Link to all my socials is in my bio!
Video Title- Rock ID With Willsey, Ep 3: Basalt And Its Many Appearances
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