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1answer
210 views

What is an isolated land area of one type of rock surrounded by land of a differing rock type called?

For example, if there were a large land area with exposed basalt, in the middle of which is a smaller isolated patch of Granite, what is that isolated patch called? I came across the single-word ...
4
votes
2answers
61 views

Subrelluric forces in a volcanic eruption

I am listening to a song about volcanoes. It is called "Pyroclastic Annihilation" performed by a brutal deth/thrash metal band called "Demolition Hammer". It is from their album "Epidemic of Violence" ...
5
votes
1answer
250 views

How does palingenetic fusion occur in rock?

As far as charnockites are concerned, granitic charnockites are formed due to palingenetic fusion and metasomatism, while granulitic charnockites are formed due to high grade metamorphism. When I ...
1
vote
1answer
1k views

What are the differences between alluvial, eluvial and colluvial deposits? [duplicate]

There's always confusion and disagreement when these terms are mentioned. Need to be sure of their exact meanings.
6
votes
1answer
2k views

What separates the Karakoram Range, the Hindu Kush, and the Himalayan Range?

In Google Maps, I don't see any boundary between the Karakoram (a.k.a. Karakorum) Range, the Hindu Kush, and the Himalayan Range. What separates these ranges?
6
votes
1answer
1k views

How did the terms “acidic” and “basic” come to be associated with $SiO_2$ in igneous rocks?

Students of geology are introduced to in their petrology course, (or used to be), to the terms "acidic", "basic", and the associated term "intermediate" in relation to %$SiО­­­_{2}$ in igneous rocks, ...
4
votes
2answers
187 views

“Impression and pseudomorphism” in fossils

In a book on invertebrate paleontology I have (Treatise on Invertebrate Palaeontology, A) there is a diagram showing possible fates of a shell after the death of the organism. One of the possible ...
3
votes
1answer
29 views

MS in Geosciences With Concentration in Environmental Geosciences Degree Outlook

I am considering a MS in Geoscience but am curious with the naming conventions associated within the fields of geology. Is Geoscience similar, or interchangeable with geology? Yes, I would be new to ...
0
votes
3answers
859 views

If rocks are stones, what type of rock are gallstones? [closed]

From Wikipedia: Rock or stone is a natural substance, a solid aggregate of one or more minerals or mineraloids. For example, granite, a common rock, is a combination of the minerals quartz, ...
5
votes
2answers
2k views

What is the difference between nappe and thrust sheet?

The titles of many geology articles contain words like "nappes and thrust sheets". Basically these are rather similar and in certain languages can be denoted with one term. The dictionaries tend to ...
5
votes
1answer
154 views

What is a “show” in petroleum geology?

Is a show when naturally ocurring oil seeps out of a fracture on the surface? Or is it when engineers fracture rocks in order to extract oil?
5
votes
3answers
4k views

Difference between “Geology” and “Physical(Natural) Geography”?

I know "Geology" is a branch of "Natural sciences" and is for studying natural and physical phenomena related to earth. But "Physical Geography/Natural Geography" seems to study exactly the same thing....
-3
votes
3answers
508 views

Why are geologists and geographers not specialists in one of the branches of Earth science?

I though that geologists and geographers are specialists in one of the branches of Earth science, but they aren't. Geology is a branch of Earth science, but geologists and geographers are in this ...
2
votes
1answer
192 views

If lava flows back into the ground, would it be called magma?

If lava flows back into the ground, would it be called magma again? Is there a difference if it flowed into a new hole vs the flow it came from?
9
votes
3answers
620 views

What do you call boulders of non sedimentary rock that were lithified into sandstone?

I'm convinced there is a word for this. I was in the Hoodoos at Writing on Stone this weekend and kept noticing what looked like reddish quartzite boulders laying around in the sand, or sometimes ...
18
votes
3answers
12k views

What is the difference between eluvium and alluvium?

I was reading about kimberlite on Wikipedia and it mentioned eluvium. I've heard of alluvium, alluvial fans, alluvial deposits, etc. However, when I looked up eluvium, it sounded exactly like alluvium....
21
votes
6answers
93k views

Is there a difference between rock and stone?

I couldn't find the definitions from either source: Geology Dictionary Glossary of Geologic Terms