Matching

1. When sedimentary layers are first formed, the sediments f in horizontal layers

A. Uniformitarianism
B. Principle of faunal succession

C. Principle of superposition
D. Principle of original horizontality

2. Scientist today belive that as the earth formed different types of life came into being at different times so geographically when fossils found in rock layer are consider it is believed that identification of the fossils can help determine the age of the sedimentary rock layer the fossil is found in

A. Uniformitarianism
B. Principle of faunal succession

C. Principle of superposition
D. Principle of Original horizontality

3. The belief that the process at work today that shape the face of the earth that were at work in the past it is important to understand that not only did the process occur in the past but they that they occur at the same rate and in the same way

A. Uniformitarianism
B. Principle of faunal succession

C. Principle of superposition
D. Principle of original horizontality

4. The principle states that in layers of rock that have been undisturbed geologist say under formed the lowest layers formed first then the next and the next and so on to the top layer that puts the oldest layer on the bottom and the layers get younger as you go up

A. Uniformitarianism
B. Principle of faunal succession

C. Principle of superposition
D. Principle of original horizontality

D. Principle of original horizontality

B. Principle of faunal succession

A. Uniformitarianism

C. Principle of superposition

Explanation:

Question 1

The principle of original horizontality is one of the foremost relative dating principle that is wide used in stratigraphy.

It states that "sedimentary rocks are laid down flatly on top one another in a sedimentary basin".

Sedimentary rocks will only vary vertically, but laterally, they are uniform and internally homogeneous in space. This is why most sedimentary rocks are stratified and laid layers upon layers just like the pages of a book.

Each layer is called a bed and often times are laterally continuous in space within the same basin.

Whenever we see beds not horizontally continuous, we can conclude that a tectonic event must have disrupted the sequence and it came after the it was formed.

Question 2

Principle of faunal succession succession was proposed by Williams Smith, an English Geologist and a canal worker in the 19th century.

Based on this principle, sedimentary rocks can placed in their proper chronostratigrahic framework based on the fossils they contain in them.

Question 3

The principle of uniformitarianism was one of the disruptive proposition in earth science.

A Scottish name James Hutton while in the country side made this proposition as he observed how landform in his native changed with each episode of season.

The principle proposes that "the processes occurring today have occurred in the time past at the same rate".

This way, it was much more easier to understand how land changes in pre-historic times have occurred.

Before his theory, the principle of catastrophism was the widely accepted one. This theory suggested that events occurred rapidly and changes to the surface are much more faster.

Question 4

The principle of superposition is one of the relative dating principles. It proposes that "in an undeformed land sequence, the oldest rock is at the bottom and the youngest on top".

The first sediment to get deposited fills the bottom as it aggregates upward. This leaves the youngest lithology to the top of strata.

The principle is correct for undeformed or undisturbed rock strata.

Where the sediments are disturbed, the formation might be overturned and this principle might be difficult to apply.

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