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If the same index fossils are found in different rock strata miles apart what is probably true about the rock layers?
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Why is it necessary to observe the rock layers of several different localities?
Due to missing layers in the rock strata caused by erosion.
What are the layers of sedimentary rocks called?
Strata (singular: stratum)
Sedimentary deposits built into relatively regular layers are known as?
Strata.
Where are the earliest fossils found?
In undisturbed strata, the oldest fossils will be the deepest from the surface.
What is the position in which fossils and rocks are placed in strata?
sideways
What are strata and stratification?
Strata are layers. Stratification is the separation of different items into layers or tiers.
How scientists determine the age of a fossil?
The dating of fossils was originally done by their placement in a geologic column of rock strata. Because of the Law of Superposition, the deeper the stratum, the older it is (in an undisturbed body of rock or sediment). Fossils which were evident in a particular stratum, but missing from other strata were noted as "index" fossils. The presence of these fossils indicated the age of the stratum relative to other layers. The layers of stratum were placed in a geologic column, subdivided, and assigned names based on the presence of different types of fossil organisms.This is the basis of "relative dating" of rock layers and fossils, a dating technique that was in effect until the advent of radiometric techniques in the twentieth century.
Why is it necessary to observe the rock layers of several different localities?
Due to missing layers in the rock strata caused by erosion.
What is true about fossils in the same rock layer or strata?
Based on the Law of Superposition, the most recent fossils would be in the top strata, the oldest in the bottom.
What are the layers of sedimentary rocks called?
Strata (singular: stratum)
What does relative dating tell us about rock layers and the fossils they contain?
Relative dating tells us the age of the strata in relation to each other. Older strata are invariably further down, except on the rare occasions of overthrusts. When an overthrust occurs there is typically a discontinuity--clear evidence this has occurred. More recent layers will be deposited above the older layers.
What is the difference between strata and stratification?
Strata refers to distinct layers or divisions within a rock formation or other material. Stratification refers to the process of arranging or forming these layers. In essence, strata are the actual layers, while stratification is the process of layering.
How do you determine the order of rock layers?
The chronological order of rock layers is usually determined by their order in an undisturbed sequence of strata. According to the principle of superposition, the oldest layers would be found at the bottom and the youngest layers at the top. In disturbed rock layers (those that have been folded, uplifted, or generally disrupted by tectonic forces), the determination must be made based on the presence of index fossils, comparison to undisturbed strata or radiometric dating.
Sedimentary deposits built into relatively regular layers are known as?
Strata.
Where are the earliest fossils found?
In undisturbed strata, the oldest fossils will be the deepest from the surface.
What are synonyms of strata?
layers, levels
What are layers of rock called?
Strata
