A fossil ';mold'; is a rock like model of the organisms. True or False?

False. It is the imprint of the organism. The model of the organism is called a cast:


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Fossils are preserved in a variety of ways. The hard parts of some organisms are permeated by minerals in a process called permineralization. Petrified wood is an example of permineralization. Many plants are preserved as compressions. In this process, the remains of the organism are squeezed by the rocks that surround it until all of its liquids and gases are removed, leaving only a thin film on the surface of the rock. The hard parts of many Ohio fossils were dissolved by ground water moving through the sediment or rock and replaced with minerals in the water. This process is called replacement. In Ohio, common replacement minerals are pyrite and silica. Ground water also may dissolve the original material without replacing it with other minerals. If the sediment hardened into rock before the fossil was dissolved, the rock retains the imprint of the fossil, which is called a mold. A mold may later be filled with other sediment or minerals precipitated from ground water, making a cast of the fossil. A cast is a replica of the original fossil in a different material.A fossil ';mold'; is a rock like model of the organisms. True or False?
Ah, I thought you were talking about fossilised fungi for a while there.





Yes, although it depends on what kind of fossil you are talking about. If you mean like bones and ammonites then yes, it is a mold. Sometimes it hasn't been filled with anything and is just an impressing, but we can create models with plaster of Paris. The skeletons you see in museums are made of replica fossils, the real ones are kept locked safely away.





When the remains of a dead animal lucky enough to be fossilised are buried, usually only the hard parts are preserved. The mud it is buried in is eventually compressed into sedimentary rock, and various geological processes will dissolve much of the actual remains. The space left may eventually be filled with new minerals, dissolved in groundwater. This is permineralization. This may happen so gradually that even the tiniest details, such as the spaces for blood vessels, or the spongy marrow bone, is preserved as rock too. Fossils, while some may look like bones, are all rock.A fossil ';mold'; is a rock like model of the organisms. True or False?
True
Too true.