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What is the Bouma sequence?

The Bouma sequence is used to identify turbidite (underwater debris flows) deposits within the rock record. It has five subclassifications:T e - massive mudstoneT d - planar laminated siltsT c - rippled or c...
JW
Answered by Josh W. • Geology tutor
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Describe how you can distinguish between intrusive and extrusive igneous rocks?

Crystal size is used to distinguish between intrusive and extrusive igneous rocks. Intrusive rocks such as granite will have coarse crystals whereas extrusive rocks such as basalt will have fine glassy cryst...
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Answered by Sian S. • Geology tutor
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What is the difference between Oceanic and Continental Crust? What happens to the Oceanic crust when they collide?

Both oceanic and continental crust are less dense than the underlying mantle rocks which are ~3.3g/m 3 and therefore they 'float' on top of the mantle. Oceanic crust is formed primarily of dense basaltic roc...
JM
Answered by Jacob M. • Geology tutor
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What is the theory of Continental Drift and what evidence is there to support it?

Continental Drift is a theory credited to Alfred Wegner in the early 1900s. This theory implies that the continents were once joined in one supercontinent called Pangaea and have since drifted apart. The mov...
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Answered by Jacob M. • Geology tutor
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How do anticline and syncline folds differ?

An anticline is an arch-like fold which has the oldest beds at its core and the layers become younger towards the edges of the fold. A typical anticline is convex up in which the hinge or crest is where the ...
JM
Answered by Jos M. • Geology tutor
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