Chapter 9 Geologic Time
Geological Dating - ProProfs Quiz
- Distinguish different types of unconformities in the stratigraphy of the Grand Canyon.
- The only materials that start out with usable amounts of carbon in them are carbon-bearing materials which derived their carbon immediately from the atmosphere or from shallow water.
- Inclusions are sites within a rock of missing time and were originally horizontal and cross-cutting.
- Inclusions are older than the rock in which they are found because the inclusion must have been part of some pre-existing rock, now somehow contained within a relatively new rock.
- Remember to put your name on your exercise pages, not just the outside of the envelope.
Four major unconformities are evident in the Grand Canyon cross-section. Strata are layers of rock. Between which two rock layers use the names of the rock layers shown on the diagram does the unconformity occur? Note that the first four answers are already given to you.
Multiple Choice Quiz
In the sequence of geological eons, eras, or periods, where is the unconformity located? The three different types of unconformities are shown in the textbook refer to the index of the book to find where. There are two parts to this lab exercise A. Using the pulldown boxes, blind dating français match each item on the left to the corresponding item at right. Why is an angular unconformity the easiest type of unconformity to recognize and understand?
This means that the remains of living things are useful for carbon dating. Match the law or principle of relative dating with the appropriate description. Some questions in this exercise may have more than one correct answer. In order to answer the following questions, you will need additional geologic information about the Grand Canyon. Inclusions are usually the same age as the rock in which they are found because the inclusion and the rock that contains it must have formed at the same time.
The strata exhibit parallel bedding or stratification, making the unconformity difficult to recognize. Thus, carbon is of no use in determining the absolute ages of, for example, dinosaur fossils. Which of the following laws or principles do we credit to Nicolaus Steno in the late s? What evidence do you specifically see that allowed you to identify an unconformity at this location?
Use the theory of radioactive isotope decay to calculate parent and daughter isotope abundances and determine the absolute age of geological materials. Which of the three types of unconformities is this?
Schist forms deep in the crust and must be uplifted and eroded to have the sediments that form limestone deposited on top. And answer choices in this exercise are randomized and will appear in a different order each time the page is loaded. Match the type of unconformity with the appropriate description. You can either print out and mail a copy of your marked-up exercise Part A from Dr. View the above image, hookup water a cross-section side-view of a cut-out through the crust of the Grand Canyon.
- It consists of horizontal stratified sedimentary rocks both beneath it and above it, creating no angle across the unconformity.
- Unconformities represent periods of faster or increased deposition of marine sediment.
- Study this diagram carefully, noting the orientation of individual rock layers, as well as the type of rock in each layer, and the age of the rock in each layer.
- It consists of sedimentary rocks that are in contact with parallel-layered metamorphic rocks, like gneiss.
- Each of the four major unconformities in the Grand Canyon can be identified as one of the three specific types of unconformities.
Determine relative geologic age sequences using the basic principles of relative age determination. You are now absolutely and relatively up to date! Why are inclusions in rocks excellent indicators of relative age? Most rocks, however, are not useful for carbon dating either not enough carbon, or didn't derive its carbon from the atmosphere-shallow water reservoir.
Multiple Choice Quiz
Which of the following is true about a disconformity? It consists of metamorphic rocks above a set of sedimentary rocks in fault contact, creating no angle across the unconformity coupled with fault breccia at the surface. Which principle or law is employed in understanding the history displayed by the rocks in the photograph? Refer to the geologic time scale on page for the names of each of the geologic time periods, as well as the absolute dates attached to each Period. Unconformities represent uninterrupted, what to write in online consistent deposition of sediment.