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When the original parts of an organism in a sedimentary rock are weathered and eroded what hollowed-out impression forms?
Wiki User
∙ 11y ago
a mold is formed
Wiki User
∙ 11y ago
Nate Criswell
Mold
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What are two kinds of rocks that are easily weathered by carbonic acid?
Limestone and marble.
Why does sedimentary rocks form?
Fossils are not formed from sedimentary rock, but within it. An organism that is deposited in sediments after death is covered by additional sediments that protect it from predation and decay. Over time, mineral rich water percolating through hard organic tissue (particularly bone) gradually replaces bone, resulting in lithification (sedimentary rock formation). A record of the organism is thus recorded in the rock--a fossil. A second type of fossil is permineralization, or the infilling of cavities within the dead organism with other material. A third type of fossil is the impression left in soft sedimentary layers (particularly mud) of a track (foot step) or body--such as a leaf, shell, fish or bird. 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 rotting or being eaten by scavengers, it could eventually become part of the sedimentary layer that lithifies (becomes rock).
Are Sedimentary rocks formed from broken fragments called organic?
They would only be organic if the particles or fragments are from a once living organism - sea shells, coral, etc.
What are mold and cast fossils?
A fossil mold is formed by the impression left in rock by the remains of an organism. A cast fossil occurs when the mold is filled in by precipitating minerals.
What is the difference between trace fossil and index fossil?
A trace fossil is one that merely indicates that an organism left evidence of its existence. Some examples would be burrows or footprints that appear in sedimentary rock. An index fossil is of an organism that dates to a particular time in the geologic record, the organism only appearing in a certain segment of that record. Index fossils are indicators of the age of the rock in which they are found.
What is the impression of an organism called?
Pedo
Can igneous and sedimentary both form fossils?
In certain cases some igneous rocks can show the impression of a living organism, as in the case of trees being encased in lava flows or pyroclastic flows preserving the shape of a human as in Pompeii. Normally however, fossils are found in sedimentary rocks.
Can a fossil be an impression of the original organism?
Yes.
Can limestone be considered as living organism or has life?
No, limestone is a sedimentary rock, not a living organism.
What is called when organisms are trapped in sedimentary rock?
when an organism is trapped in sedimentary rock, it will die and the organism will slowly decay, but it won't decay altogether and you get a fossil. the older the fossil is the lower down it will be in a sedimentary layer. that's called superposition...
Two kinds of rock that are easily weathered by carbonic acid?
living organism and acid rain?
Is a sedimentary rock a fossil?
A fossil is any record of an organism preserved in rock, whether it be igneous, sedimentary, or metamorphic. Nearly all fossils are discovered in sedimentary rock.
What are remains of once living organism found in sedimentary rocks?
Fossils.
What are 2 sedimentary rocks that contain dead organism?
Limestone and shale
What is sedimentary rock formed from pieces of once living organism?
organic
What are two kinds of rocks that are easily weathered by carbonic acid?
Limestone and marble.
What are casts and mold?
a mold is an impression of an organism. a cast is a mold filled with sediment
