21.3 absolute age dating of rocks

Share buttons are a little bit lower. Published by Bernadette York Modified about 1 year ago. Describe the geologic time scale 2.


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Distinguish among the following geologic time scale divisions: Master the geologic principles of original horizontality, superposition, cross-cutting relationships, inclusions, and methods for determining relative age. The oldest part of the scale is on the bottom. The same as the rock layers oldest on the bottom.

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Longest time unit and is measured in billions of years. Archean Stromatolites created free oxygen and began to change the composition of our atmosphere. Each Era is divided into Periods.

Absolute age dating of rocks

The first 2 Eons Archean and Proterozoic , represent this Precambrian time period. All organisms of this time had soft bodies with no shells or skeletons. Ex Worms and sponges. Oceans fill with diversity of life Cambrian period: Amphibians left water for land -large water reptiles emerge -Dinosaurs emerge.

Dinosaur pop goes down Mammal pop goes up Flowering plants and trees emerge. This sharp division in time is the K T boundary -Dinosaurs and many other groups go extinct here million years ago.

Many periods named after geographic locations. Are time divisions of a period. The processes concerning mountain building, erosion, and sea level changes that are occurring today have been occurring since Earth formed. Places rocks and events that formed them in order, but without exact dates. A There are four basic concepts for relative age dating. Principle of original horizontality 2. Principle of superposition 3. Principle of cross-cutting relationships 4. Principle of original horizontality a Sedimentary rocks are deposited in horizontal or nearly horizontal layers.

Principle of original Superposition a The oldest rocks are on the bottom and the youngest rocks are on top. Principle of cross-cutting relationships a An intrusion or a fault is younger than the rock it cuts across.


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Inclusions a Rock fragments found in sedimentary rocks are older than the rock itself. A gap in the geologic rock record. When sedimentary rocks overlie at an angle to horizontal sedimentary rocks. Sedimentary rocks overlie non-sedimentary rocks suggesting uplift of the non-sedimentary rocks. The actual age of the rock or fossil is determined. The emission of radioactive particles and the resulting change into other elements over time. Once the emission begins the rate of decay is a constant regardless of the environment, pressure, temperature, or other physical changes.

Process of calculating the ratio of parent nuclei to daughter nuclei within a given sample of a rock or a fossil. Atoms of the same element that have different mass numbers and the same chemical properties.

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Absolute dating of sedimentary rocks

Relative age — stratigraphic relationships, fossils. History of geologic dating — Age of the Earth. Catastrophism —- Young Earth. Relative ages are not numbers.

They are descriptions of how one rock or event is older or younger than another. Relative age dating has given. Scientist use the ratio to determine the absolute age of the rock or organic. Relative Dating — Observe rocks in the field and determine the order of events. Absolute ages are numerical, quantitative, ages of geologic events, and have. The principles that allow us to determine relative age the principles of stratigraphy.

Presentation on theme: "Ch 21 Fossils and the Rock Record"— Presentation transcript:

How we can use fossils and rocks to understand Earth History. This plate shows a date of , thus the Tin Cans layer is about 61 years old. Absolute Dating and the Geologic Column.