Rules of relative dating

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The Grand Duke, known for sponsoring the sciences, took Steno in as his official physician and supported his research into anatomy and geology.

Nicolas Steno (probably painted by Justus Sustermans between 1) Interesting, later in his life Steno’s interests changed from natural science to theology.

Rock layers represent "historical events," so a rock layer is like a page in the book of Earth's geologic history. There are five different pictures of one rock sequence throughout time.

Number the pictures from one to five with one being the oldest and five being the youngest.

(In the interests of credit, Baron Georges Cuvier was also documenting this principle at the same time in France.) Smith, a canal engineer, noticed that there was a regular progression in the order of fossils in the strata.

He already knew Steno’s Principle of Superposition, so his suggestion was that fossils changed through time in a predictable order.Where are the oldest pictures, by year, going to be in your stack? Often igneous intrusions will cut across layers of rock.The principle of cross-cutting relationships states that the intrusions are younger than the rock they cut.They include: Steno’s third principle, which does not really apply directly to relative dating is the Principle of Lateral Continuity.This one states that rock layers are horizontally continuous.It doesn’t give an exact age but a relative (or comparison) age. Each layer will be successively younger or more recent. Superposition is the principle that says younger rocks lie above older rocks in an undisturbed sequence.This means that you know which events came first, but not the exact time when they happened. Scientists use the fossils of animals to help determine relative age.He joined the Catholic Church and eventually became a bishop.In 1938 he was canonized as a saint, and in 1988 he was beatified.Below each picture choose the process that is taking place in the box above.(Hint for help numbering the boxes refer back to the last three paragraphs.) Write the term that describes the event that happened in the space below the drawing.


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