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Igneous rocks form directly from a melt, hence there are no fossils contained within them.
Metamorphic rocks are pre-existing rocks (sedimentary, igneous, or even metamorphic rocks themselves) which have undergone significantly increased pressures and/or temperatures. Any structure(s) or fossils which may have been present tend to be destroyed, reworked, or have their character diminished. Additionally, the presence or absence of water can often cause a wide variation in the mineral assemblages.
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∙ 11y ago
Habiba Saeed
Habiba Saeed
because igneous rocks form from molten rock which can be extremely hot .
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What are the types of rock that contain fossils?
sedimentary rocks
Which type of rock is where fossils are found?
They are mostly found in Sedimentary Rocks
Geological time is divided into units based upon types of what?
it's based on the types of fossils and rocks
How do you classify igneous rocks from other types of rock?
Igneous rocks are identified by first looking at the color index. Felsic igneous rocks contain mostly potassium feldspar. Intermediate igneous rocks contain mostly plagioclase feldspar. Mafic igneous rocks contain pyroxene, olivine, and plagioclase feldspar. Ultra mafic igneous rocks contain mostly olivine. Then igneous rocks are identified based on texture. For example, the texture of igneous rocks can be aphanitic, pegmatitic, phaneritic, glassy, vesicular, etc.
Is a sedimentary rock made of crystals?
Sedimentary rock is composed of minerals. The minerals may be in the form of particles of other rocks that are made of minerals themselves, as well as the minerals of the cementing material that holds those particles together. In certain cases, the minerals have formed as a result of the evaporation of or precipitation from saturated solutions containing the components of minerals. Sedimentary rocks can contain visible crystals as well as crystals that are not visible without the aid of magnification.
What types of rocks contain fossils?
Igneous rocks and most metamorphic rocks, of an igneous origin.
What are the types of rock that contain fossils?
sedimentary rocks
What types of stones are most likely to contain fossils?
There are three basic types of rock; sedimentary, igneous and metamorphic. Igneous rocks are formed by volcanic action and don't contain fossils. Sedimentary rocks are formed, usually under water, by eroded material accumulating. Metamorphic rocks are formed when sedimentary rocks are changed by heating and/or pressure. From this, you can see that sedimentary rocks are the most likely to contain fossils, although metamorphic rocks also can contain fossils. Any sedimentary rock can contain fossils, but some make fossil hunting easier. Shales and mudstones are particularly good; chalk is pretty much entirely made of fossils - it's formed of skeletons of small organisms, but its difficult to see the individual fossils.
Are fossils abundant in all types of rocks?
no they are not. If you go outside and look around and look at all types of rocks you will probably not find a fossil. Fossils are rarely found.
What types of rocks are fossils most likely to be found?
fish fossils and little animal fossils and also shells
What is the difference between the two types of igneous rocks?
Extrusive igneous rocks form from magma that erupted onto the surface as lava, where it cooled quickly. On the other hand, intrusive igneous rocks form from magma that cooled slowly, deep underground.Obsidian has tiny crystalsGranite has large crystalsIgneous rocks do not contain any fossils. This is because any fossils in the original rock will have melted when the rock melted to form magma.
Which type of rock is where fossils are found?
They are mostly found in Sedimentary Rocks
What fossils are most useful for correlation tend to be?
Fossils that are the most useful for correlation tend to be found in various types of rocks, are widespread, and easy to recognize. One rock type where fossils are found is sedimentary rocks.
What rock types would most likely contain fossil?
Sedimentary rock is the only type of rock that will contain fossils, but there are several types of sedimentary rock.Examples:Clastic Sedimentary Rocks (particles of silt and/or sand that cement together): Conglomerate, Breccia, Sandstone, Siltstone, Shale.Examples:Chemical Sedimentary Rocks (forms when mineral constituents become supersaturated and inorganically precipitate):Evaporates:Halite, GypsumCarbonates:Limestone, Fossiliferous LimestoneSiliceous Rocks: ChertOrganic Sedimentary Rocks: Coal.The rocks listed in BOLD will likely be found with fossils.
If you were looking for fossils in what types of rocks would you expect to find them?
Sedimentary rock layers.
Why are fossils found in only sedimentary rocks?
Sedimentary rocks can contain fossils because, unlike most igneous and metamorphic rocks, they form at temperatures and pressures that do not destroy fossil remains. Dead organisms can become sediments which may, under the right conditions, become sedimentary rock. Igneous rock forms from magma; no chance for fossils to form there. Metamorphic rocks are other rock types that are changed by heat and pressure; their transformation and mineral reorganization causes very few fossils to be found there. Sedimentary rock can be formed from the accumulation of sediments and are often formed near ancient shores, basins, and lake beds. If an organism dies and is covered by sediments before being rotted or eaten by predatory organisms, it could eventually become part of the sedimentary layer that becomes rock
Which type of rock records the history of life on earth?
There are two types of rocks that record the history of life on Earth. These rocks include fossils and geodes.
