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Questions tagged [geology]

The science comprising the study of the rocks Earth is composed of, and the processes by which they change. Some subfields of geology are petrology, mineralogy, and geophysics.

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Asking about type Fossil [closed]

Can any one help me to identify this type of fossil ? Its dolomite limestone
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68 views

Please help identify

I have had this rock in my yard for close to 10 years. It was left behind by the previous tenant. Can you help identify it? It has layers, a mixture of soft and hard, and is tan to white in color. ...
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157 views

Is astrochronology a proper method?

Wikipedia's definition of astrochronology is: "Astrochronology is the dating of sedimentary units by calibration with astronomically tuned timescales, such as Milankovic cycles,1[2] or even ...
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If the earth were completely smooth and covered in water, what would occur with ocean waves?

Related to this post: If the Earth were a smooth spheroid, how deep would the ocean be?
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159 views

Help me figure out what this purple rock is

I found this in the ground at a job site in blue springs mo . Its purple with darker purple lines through it like growth marks on a tree. It is about the size of a large loaf of bread 7 inches across ...
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I found this huge rock crystal by the river have no idea what it is?

![crystal rock yelowish to red yellow to orange has 3 layers of crystal )
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What on Earth in can repel a magnet? [closed]

The iron in blood is naturally repelled by a solid magnet the opposite of iron outside of blood by a magnetic field and I wander... Are there any elements that are repelled by a solid magnet? https://...
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52 views

I need help to identify this Stone [closed]

I would like help to identify this Stone. I have found a large amount of these stones in my yard. I would just like to know if they are worth anything or if I'm just going to have a pretty driveway ...
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109 views

What is the parent rock in this photo?

Please help find out what this rock formation is and where it is found in the world?
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66 views

What type of minerals exist in this rock?

![enter image description here]Arizona desert wash A very heavy rocking have a few and when busted open beautiful veins of dark silver sometimes yellow gold.light pink and teal looking(https://i.stack....
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Rock ID: round, black, heavy, non-magnetic rock from UK

What is this rock? UK origin, non metallic, heavy
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1answer
348 views

A layered smooth rock that sparkles under a flashlight, with transparent plastic-like parts

I have this rock that has really weird designs, different colors, really heavy, seems to have a shell with layers, and a part a layer of the rock is dark gray and sparkles under a flashlight? It is ...
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Time of concentration - Difference between large and small basins

I am looking for any academic reference (i.e. articles) regarding the time of concentration for large and small basins. E.g. I would expect that a large basin (area > 1,500 km^2) will flood (or reach ...
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Rock ID: Bone and potato-shaped, copper-colored

I found these two intriguing rocks on the UK's seaside. They have an unusual potato shape and copper/green color. Whrn knocked against each other, the sound is clear, metallic and the vibrations keep ...
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Can anyone help me identify this type of translucent green mineral? [closed]

This is the photo of the rock. I found it in the mountains in yemen, near rocks where a well was dug out. Its translucent green and It doesn't feel that heavy. I think it's some type of quartz.
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Is this Dragon Jasper?

Bought these rocks at a shop they were selling as Dragon Jasper,but when I density tested them they were 3.09 which I thought was a bit high for Jasper, and generally Dragon Jasper has Deep red veins, ...
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1answer
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Is this an agate? [closed]

So I have found these in a creek there are some that look like this and I have broke them open and they were full of crystals these seem to small and I have tried cracking then and they wont budge I ...
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I found this rock on my property years ago and was curious what it was [closed]

What kind of rock is this? I found it on my property a long time ago and I can pinpoint exactly what. I was thinking red jasper maybe?
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153 views

What is this green yellow heavy stone?

no known origin,its opaque its 2 1/4" leaves no streak, has a hardness of 6-6 1/2 I drilled it with a diamond plated bit,it is a very tough stone.It weighs 2ozs 56.6 grams.When I drilled it the powder ...
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155 views

Is this a gold ore? I found it in a California creek next to a mountainside

I found this rock while hiking in a creek. It has some bits of white quartz, sheen and some brownish coloring. Does anyone know what it could be? Is there any possibility that it might be gold ore? ...
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66 views

I need help to identify this rock

I would like help to identify this Stone. I found this stone in my back yard. I would just like to know if it is worth anything or if I'm just going to add it to the driveway.
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1answer
147 views

What is this heavy rock having gold-olive colour and tiny gold coloured crystals?

The rock is very heavy, about 1.2 kg and 5 inches (~ 13 cm) long, gold–olive colour. The back has tiny gold coloured crystals and the front has bigger ones as seen in the picture. I don't really know ...
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1answer
62 views

What kind of stone is this?

Years ago, I bought from a flea market two strange looking stones, that the owner said he had found under the sand of a dune in the desert (I don’t remember which). Maybe it’s true, maybe not, but I ...
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73 views
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131 views

Mineral Identification

I have a green, moderately magnetic, rock with yellow inclusions. The rock is very heavy for its size. What is the most likely minerals in such a rock? Update: Found on the Maine coast. Rock has been ...
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90 views

Hhhm.. wonder what it is

I found it in a vein, heavy, not magnetic, slippery pin sticks in it and I can scratch it with a fingernail.
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Flooding lakes in geography

Came across the following problem on a question sheet. At its maximum level following deglaciation, approx 11,000 years ago, Lake Melville flooded the Sebaskachu River valley to an elevation of 135m ...
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How would the climate and human life be if there were no variance except temporal due to the solar angle and spatial due to the latitude? [closed]

I would like to describe a very specific scenario much clearer than simply no Milankovitch Cycles but my question would be closed as too broad due to the apparent verbosity. Or at least I presume so ...
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1answer
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Is this olivine?

Could this small rock be olivine? It has got a rough feeling surface, and 'it's heavy. I found this in Wales 12 years ago.
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Can you please help me to identify this thing I found inside a rock in the Almanzora riverbed Spain

Can someone please help me identify this thing I found inside a rock in the Almanzora riverbed Spain
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Assessing graded bedding in metamorphosed pelitic sediments

I have the following image of metasedimentary outcrop from a Proterozoic continental rift-fill sequence: The middle layer has a pelitic composition and contains abundant cordierite porphyroblasts (...
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What leads to formation of a nonassociative gas reservoir?

Why in some cases natural gas occurs in association with oil (associated gas) and in others there is no oil (nonassociated gas)? Is it because of the type of the rock? Or is it the pressure/...
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1answer
63 views

Help identify my redbrown rock with crystal like formation on the inside

This rock is red/orange/brown in color. It is slightly clear/translucent when held up to light. Will not scratch with a knife. Has a crystal like structure on the inside.
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321 views

What type of rock is this black and brown rock found in Virginia caverns?

Found this rock deep in the Luray Cavern System, what is it?
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293 views

what is this white rock, Saudi Arabia mountains

Hello, my friend has this solid white rock, can you tell me about it, thanks all.
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73 views

What are some regions where land-living island animals have left fossil records within the sea, of the coast of the island?

What are some examples of fossil sites where land-living fossils end up in the sea, off the coast-line of an island?
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How much coal does it take to generate oil?

I'm going to be doing a presentation for grade school children, and I'd like them to get a feel for how much source rock it takes to make oil. It takes about a 10 foot layer of swamp debris to make ...
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2answers
93 views

What are the farthest Time Zone locations? [closed]

What place in the world has the farthest time zone? I heard it was Kiribati but then I found that Apia (Samoa) is further. So, is there anyplace that is the farthest in time than these two? What about ...
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1answer
85 views

At what rate does Earth's atmosphere shed heat into space? [closed]

If we had a heat bank account (the atmosphere) + heat cash supply (ice) + heat debt (the oceans) could governments find a way to balance our heat economy that doesn't kill ...
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3answers
454 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 ...
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133 views

To find hardness in Mohrs scale [closed]

Except diamondת which mineral is having high hardness in Mohr scale. A Oxide B silicate C carbonate D phosphate
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3answers
210 views

Is this a meteor? It's very heavy for its size [closed]

Here it is. Hope this helps you best image I could take.
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1answer
270 views

Can a shock wave travel around the Earth's curvature?

Can an explosion be felt in the ground on the opposite side of the Earth like from an asteroid? Would planes in the air on that side of the Earth be able to survive? Does the shock waive follow the ...
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Is angular momentum preserved in a gastropod fossil?

In the Northern hemisphere the rotation of the Earth determines a counter-clockwise spin on matter. Weather, ocean currents all are related in that spin. I wonder if my snail fossils preserve the ...