because they are sedimentary rock
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true A+
Tertiary fossils are usually found in sedimentary rock layers. Sedimentary rocks are formed by the accumulation and compression of sediments over time, making them a common host for preserving fossils from the Tertiary period.
Fossils found in the upper layers of sedimentary rocks are generally younger than those found in lower layers, due to the principle of superposition, which states that in undisturbed layers, older sediments are deposited first and are buried by younger sediments. If there are no sedimentary rocks present, it is impossible to compare their ages directly. Thus, the age of the fossils can vary significantly depending on their specific geological context.
In an anticline, the age of the rock layers varies, with the oldest layers located at the core or center of the fold and progressively younger layers found on the flanks. This structure results from tectonic processes that push older sediments upwards while younger sediments accumulate around them. Therefore, when examining an anticline, the sequence of layers reflects a chronological arrangement from oldest at the center to youngest at the outer edges.
In disturbed sediments without layers, the relative age of the sediments would be unknown.
The oldest layers of sediments are typically found at the bottom of a sedimentary rock sequence, with the youngest layers at the top. Over time, new layers of sediments accumulate on top of older layers, creating a chronological sequence with the oldest layers at the bottom.
In rock layers, the oldest rocks are typically found at the bottom. This is due to the principle of superposition, which states that in an undisturbed sequence of sedimentary rocks, the oldest rocks are deposited first and are at the bottom, while the youngest rocks are at the top.
Sedimentation of transported weathered and eroded material is continuous, cyclical, or event based. New sediments are deposited on top of existing sediments, forming layers that may be visible in a sedimentary rock body.
true A+
true A+
Tertiary fossils are usually found in sedimentary rock layers. Sedimentary rocks are formed by the accumulation and compression of sediments over time, making them a common host for preserving fossils from the Tertiary period.
Fossils found in the upper layers of sedimentary rocks are generally younger than those found in lower layers, due to the principle of superposition, which states that in undisturbed layers, older sediments are deposited first and are buried by younger sediments. If there are no sedimentary rocks present, it is impossible to compare their ages directly. Thus, the age of the fossils can vary significantly depending on their specific geological context.
Fossils are found in sedimentary rock because it is layers of sand, rock, and sediments, and the bones fall between the layers where the form into fossil's.
In an anticline, the age of the rock layers varies, with the oldest layers located at the core or center of the fold and progressively younger layers found on the flanks. This structure results from tectonic processes that push older sediments upwards while younger sediments accumulate around them. Therefore, when examining an anticline, the sequence of layers reflects a chronological arrangement from oldest at the center to youngest at the outer edges.
The action of water and gravity cause them to form in layers.
When sediments are deposited by water, the particles are sorted by size due to the energy of the flowing water. Larger, heavier particles settle first and are typically found at the bottom layers, while smaller, lighter particles are carried further and settle on top. This results in a graded layering effect, with coarser sediments at the base and finer sediments toward the top. Over time, this stratification can reveal information about the conditions of deposition.