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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Can someone help ID this rock [closed]

Found today in a creek in Indiana, has a geode look and the broken edge shows red opaque facades.
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Can anyone help me identify this rock? [closed]

This is probably just something really common and boring to most people, but I was intrigued so I thought I might as well ask now I can. When I was in Portugal (I don’t know specifically where we were)...
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What kind of rock is this? It was inside a bigger rock [closed]

I found this when I was really little, and I'm 18 now. It was inside a bigger rock; the three pieces fit together to make one piece. The biggest piece seems to have some kind of fossil on it. I've ...
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How can I distinguish real from fake? (Jade Stone) [closed]

How can I be certain this is jade. I bought this rock from a thrift store for 40 bucks. I thought it was a bit pricey for what it is..does anybody have any solid tips on how to clean up the ...
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What stone is this?

I don’t know much about gems so I tried to upload pictures in different lighting. The corundum pic Pictured with it was scratched by this stone. I can’t tell if the corundum scratches this stone. ...
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Found this stone and would love to know what it is :) [closed]

Found this smooth & polished stone years ago while digging about 3-5 feet down in the backyard in the lower portion of NY. The light area is semi-translucent and can appear white to a very light ...
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Rock ID: silver crystalline rock found in Nevada? [closed]

Found this in a vacant lot...the silver clusters attracted me...then I think there are crystals also...found in Nevada.[
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How long will it take for the ocean to erode Rockall?

Loosely related to the question Will the ocean eventually erode all land?: How long will it take for the ocean to erode Rockall (an uninhabited granite islet within the exclusive economic zone of the ...
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There is soil in Archean? [closed]

Following a mobilista approach over geological time, and considering the Earth's internal heat as responsible for tectonic regime, which was involved in the "Permobile type" during the early times of ...
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Could someone tell me what this stone might be [closed]

It is 9 1/2 inches by 3 1/2 inches and weighs about 5 lbs. it was at this house in Florida when we bought it. It has a white 1/4 inch crust and the interior color looks somewhat topaz.
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Found a light brown rock with concentric circles on it. Is it a fossil? [closed]

I found the rock in the picture while visiting Pawnee National Grassland (Colorado, USA). The rock shows concentric circles on both sides. On one side these circles are very clear, on the other side ...
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Please Help Identify My Rock [closed]

This rock is smooth, heavy and dark grey/black in color with white blotches which are different in shape and size and are also porous. It scratches by a knife and I found it in with many pails of ...
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Rock type identification [closed]

Found this rock in western Ireland among many other like this one, its scratch resistant to a stainless steel blade, its blackish with light green spots and some tiny Pyrite crystal inclusions, it ...
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would someone be so kind as to identify this rock i found? [closed]

What is this rock I found, it's got little glittering things on it. I found this in Sussex county New Jersey, it was used to line my driveway with a bunch of other rocks, other than that I don't know ...
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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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Please help identify [closed]

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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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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Help me figure out what this purple rock is [closed]

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? [closed]

![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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1answer
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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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What is the parent rock in this photo? [closed]

Please help find out what this rock formation is and where it is found in the world?
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What type of minerals exist in this rock? [closed]

![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 [closed]

What is this rock? UK origin, non metallic, heavy
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A layered smooth rock that sparkles under a flashlight, with transparent plastic-like parts [closed]

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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1answer
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Rock ID: Bone and potato-shaped, copper-colored [closed]

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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Information on this rock, and identity? [closed]

My aunt gave me this rock. She has had for years. She was given it by a relative who passed many years ago. She said it was called a Tuffy (not sure which way it should be spelled) and that it came ...
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Can living where magnets are abundant provide a mini-magnetoshere?

Are there a mini-magnetosphere within the magnetosphere similar to mini-magnetosphere found on the Moon? Is there a map of these areas that would resemble the white swirls in the picture below? The ...
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Identification required, rock formation found whilst on holiday in Cephalonia, Greece white object embedded inside? [closed]

This rock was found in kephalonia Greece, on a beach in lassi. The rock is black in colour, smooth with thumb like prints, very metallic smell and very slightly magnetic. We took this rock to oxford ...
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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 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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1answer
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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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What is this green yellow heavy stone? [closed]

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

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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Need help identifying rock formation

so this is my first time here because I need help in identifying the features on this rock formation. https://www.flickr.com/gp/158064920@N05/6USrY9 Thank you in advance.
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1answer
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I need help to identify this rock [closed]

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
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Can anyone identify this stone? It was a gift and I can't remember what it is! [closed]

Brown tri color stone Smooth, oblong Please help identify it if if you can!
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1answer
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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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What type of rocks are in these pics? [on hold]

I am new to collecting rocks. A neighbor moved out of town and left these tossed in the yard. Unfortunately, I have no information on where they were originally collected
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How is the difference in crust and mantle composition explained?

We know that the composition of the crust is SiAl and SiMa and the one of mantle is mostly ophiolites, but why? Which are the geological processes that make this difference exist?
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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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what is this white rock, Saudi Arabia mountains [closed]

Hello, my friend has this solid white rock, can you tell me about it, thanks all.
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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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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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Height of Everest from base to top

It's relatively well known that Everest is the highest mountain above sea level, and that Mauna Kea in Hawaii is the tallest mountain from base to top. But how tall is Everest from base to top? Or to ...
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Are sand deserts the greatest natural convection heaters on Earth?

Ask any climate scientist the question: "Why are deserts so hot in the day time and so cold at night" and generally you will get the same answer, it’s all about the lack of moisture and latent heat ...
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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 ...