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The principle of intrusion states that if a body of rock contains intrusions of another type of rock, it must be younger than the source rock Principle of Biostratic Fossil Correlation states that if an index fossil of a known age is found in a rock formation, that formation is of the same approximate age as the index fossil.

This principle represents a modern extrapolation of the older principle of floral and faunal succession, which noted increasing complexity of creatures in successively younger rock strata.

Stratigraphy is a branch of geology that studies rock strata with an emphasis on distribution, deposition, age and evidence of past life.

Once Steno recognized that the fossils he was contemplating (sharks teeth and sea shells) were formed in the sediments of oceans he was able to work out the basic rules of stratigraphy.

(light brown) Next, fossil-rich sedimentary rocks were precipitated.

These rocks are tilted due to deposition on the non-horizontal surfaces of primitive rocks.

Long before geologists tried to quantify the age of the Earth they developed techniques to determine which geologic events preceded another, what are termed "relative age” relationships.

These techniques were first articulated by Nicolas Steno, a Dane living in the Medici court of Italy in the 17th C.

Relative dating uses the principles or laws of stratigraphy to order sequences of rock strata.

Relative dating not only determines which layers are older or younger, but also gives insight into the paleoenvironments that formed the particular sequence of rock.

This idea is known as Plutonism, in reference to the God of the deep underworld.

Hutton viewed tilted strata as having been initially deposited horizontally, and then were subsequently deformed (tilted and folded) by the forces of Earth's internal heat engine.

is a way to use geometric relationships between rock bodies to determine the sequence of geologic events in an area.

Relative dating is different from absolute dating in which specific dates are assigned to geologic events (we will discuss absolute dating techniques later).

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