Questions tagged [limestone]

Naturally forming sedimentary calcium carbonate. Often contains fossils, indicative of a past marine environment.

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What is this stone? [closed]

I was walking on the beach and I found a pink stone that can transmit light. Does anyone know what it is?
Doğukan Karakaya's user avatar
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How old is Niue?

I've found it surprisingly hard to find an answer to this question. Niue is an uplifted coral reef jutting above the ocean. The rock is all limestone, and there is evidence for it being around for ...
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Could travertine buildup seal up cracks in limestone?

So after a recent freeze in Texas the following overhang collapsed. Presumably water in existent cracks froze and made the cracks even bigger as the water expanded. Combined that with an increase in ...
neubert's user avatar
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What are these features on Eldon Hill?

Eldon Hill is a limestone hill in Derbyshire, England. It has a large quarry on it's NW side and a natural pothole just to the south of it's peak. It also has the remains of lead mines scattered ...
DrMcCleod's user avatar
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"Bohnerze" pisolitic ore in Switzerland

I am going hunting for iron ore in Switzerland and the plan is to visit some old abandoned mines in the Jura mountains. I am not quite sure exactly what I am looking for though, in the past I have ...
a20's user avatar
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Are we observing sedimentary rock formation today?

For instance, are we able to see the microscopic accumulation of shale or limestone? Can anyone reference me to sandstone formation observation, that would have to occur more rapidly. I’ve heard it ...
Colin Skinner's user avatar
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What is the time period of these chalk/clay layers?

These limestone-clay rocks are very common in the Alps, they come from weather changes. How many years does it take to make one of the rock bands? 7 years, equivalent to an el-nino type event? 1000 ...
bandybabboon's user avatar
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How long ago was the first limestone formed?

It is readily apparent from the fossil record that the first limestone was laid down hundreds of millions of years ago, but how long ago was the very first limestone formed? It could be approximately ...
Michael Walsby's user avatar
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Limestone formation

I live in Kingston, Ontario (The Limestone City). I have always been fascinated by the different thicknesses of strata in the exposed formations. I am wondering if there is any quick and fast rule of ...
Trevor's user avatar
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Is there limestone under the Oregon Coast Range?

I've found some diagrams of the Oregon Coast Range, but they are very basic. An friend said he thinks there is limestone deep underground, but my understanding of the formation of these mountains is ...
Tad Jones's user avatar
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How acidic waters make rocks disappear?

I was working on this science project. I was on step 11, day. 4. Since day 2, I found out that my pH and the mass of the rock (limestone) stopped changing. This project should proves acidic water ...
Dylan's user avatar
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Identification of limestone type

These are images of a stone found and used extensively in the Jammu & Kashmir region between India and Pakistan. These are called devir or devri in the local parlance. Following is the ...
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Which wavelengths is limestone most transparent to?

I think of the non-ionizing range, e.g. Terahertz or Radio. Limestone clearly is transparent to x-ray or gamma but thats not what i am asking for. Natural to low ranges of porosity/water content ...
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For how long have the great karst springs of the Aachtal been active?

Aachtal, along with Lonetal, is a valley in the Swabian Jura, Germany, and the site of many famous archaeological sites of the upper Pleistocene. It also hosts a series of very large karst springs (...
HannesH's user avatar
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Will photosynthesis based carbon sequestration always be more efficient than other chemical means - in terms of rate?

There seem to be many ideas for carbon sequestration. The problem with anything electrochemical, is that unless it is solar-based, you're putting carbon into the atmosphere at probably a great rate ...
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Why do we see the limestone on top of Cambrian layer?

The official story says like Cambrian Ordovician transition was caused/accompanied by animals learned how to build the Ca-based skeletons. These skeletons and shells started to fall upon the sea bed ...
Little Alien's user avatar
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Why limestone formation was not a concern in atmosphere oxidation event? [closed]

I have just got to know why Fe was a problem. After clay (alumnum) and Silicon got oxidized, there has left a lot of unoxidized Fe in the crust, whose oxidization has finished during GOE. But, ferrum ...
Little Alien's user avatar
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Specific Chemical Composition of Nero Marquina Marble

I'm looking to understand the chemical composition of the Spanish Nero Marquina Stone. Specifically, are the white veins of different composition than the black? We are design studio pursuing work in ...
lawrence's user avatar
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Why do ooids not grow larger than 0.5 mm?

I know ooids form in high energy water, by rolling and building layers around a nucleation site, but I don't understand what limits their size. What keeps these such a regular, small size?
Tim's user avatar
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where are the thickest limestone layers on earth ? (CaCO3)

What is the maximum thickness of limestone layers on earth? (Limestone or any other biochemical sedimentary rocks, for example chalk or coral reefs.)
reuns's user avatar
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Are there sufficient quantities of limestone to dump in the ocean to reverse acidification?

This question asked: What is the evidence it is feasible to reverse ocean acidification by adding large quantities of a base (bicarb soda)? The result was: Danny Harvey of the University of ...
hawkeye's user avatar
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What is limestone made of?

I know that it is calcium carbonate (CaCO3). I also know that these are the dead bodies of microorganisms. My question is, where do they procure the building material? The limestone seems to cover ...
Recognize Evil as Waste's user avatar
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Why are alpine river water green - blue?

I recently visited Slovenia where I saw several rivers with a strong blue-green color. Here is an example from one of the tributaries of the Soča river near Kobarid. The locals refer to it as an "...
Gimelist's user avatar
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Formation of limestone without living organisms?

Limestones are formed mostly from skeletal fragments of marine organisms. However, calcium carbonate dissolves naturally in water, so the living organisms are not the only source of it in water. Is ...
Danubian Sailor's user avatar