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obvious ..... because it is at the base, therefore it is the oldest ...... it was the first one to form as the other layers piled up on it, just like in the Maltese island ...

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Q: Why is the lower coraline limestone the eldest?
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Is ground limestone poisonous to a dog?

Well, limestone is basic, meaning the opposite of acidic. Materials similar to limestone can actually be found in antacids like Tums. So in small amounts limestone is not poisonous to a dog or anyone for that matter, it will just temporarily lower the acid content of the stomach. However, limestone should not be fed to a dog or encouraged because it still is not good for a dog to be eating or digesting straight limestone in any quantity.


Why is limestone considered a base?

If you mean base as in the opposite of acid, limestone is calcium carbonate. The pH of it is 9- any number higher than 7 is considered a base. Number lower than 7 are acid.


How does marble differ from limestone there than color?

Hardness, Elasticity, Porosity, Permeability, Density, resistance to diagenesis, conditions of formation. Generalities (this means that in general the following are true and rules don't follow the exception if any exist) Hardness: marble is harder than limestone. It has a higher compressive strength and cohesion. This can get much more technical so let's leave it at that. Elasticity: Young's Modulus, shear modulus of marble is higher. Bulk modulus and poisson's ratio of marble is lower. Porosity of marble is lower. Permeability of marble is lower. Density of marble is higher. Limestone is often altered via fluids and chemical underground and marble isn't. Marble is metamorphic rock and limestone in sedimentary. Marble and Limestone are spelled different.


What is sedimentary rock formed by shells?

Limestone can be formed partly or mostly by visible shell fragments. .


What would happen if you didn't have limestone?

we wouldn't have these- -Limestone is used in buildings and roads. - Limestone can be used in glass making. - Limestone is used in toothpaste. - Limestone is used in cement and mortar. - Limestone is used in bread and cereals as a source of calcium. - Limestone is used to make paper white. -Limestone is used to purify sugar. -Pulverized limestone is used to neutralize acidic soils. -Limestone can be used to make brake pads. -Limestone is used in the preparation of wools and dyes. -Limestone is used to make antacids. -Limestone is used in climbing walls. -Limestone is used a suppression of methane explosions in underground coalmines. -Limestone is added to plastics, paint, tiles and other materials as both white pigment and cheap filler. -Limestone is used in the manufacture of quicklime (calcium oxide) and slaked lime (calcium hydroxide). -Limestone can be used to create steel by using it in a blast furnace.