Exercise 1.1. Describing Clastic Sedimentary Rocks

What To Do

Download the printer-friendly worksheets in the format of your choice (available at the beginning of Lab 1).

Describe the clastic rock specimens in the Samples section below, and record your answers in Table 1.4. A version of Table 1.4 is provided in the worksheets.

For ease of reference, Table 1.3 is reproduced after Table 1.4 in the Reference Tools section.


Note: You should attempt to put something into each space on the table. In rare cases where there is nothing to note (for example, not all rocks will have “Other Features”), write “None.” Do not leave any blank spaces.


Click here to view this table as a PDF file.

Reference Tools

Click here to view this table as a PDF file.
When working with physical samples, use a magnifying lens and a grain card to help you identify the average grain size, sorting, roundedness and sphericity.


Advance through each of the following slide decks to see one or more photographs of each sample, and a short video of the sample being rotated. You can expand the slide decks to full-screen mode to see larger images. If you are unable to see the slide decks, click the sample title to open each deck in a new window.

Slide decks in this lab manual include high resolution images. These are necessary so you can see essential features, but it means images and videos might take a few seconds to load. Once they do, however, you will be able to switch rapidly back and forth between slides and videos in that deck.






The slides below show three examples of the same general rock type. Describe the example indicated by your TA, however you may find it useful to look at all three examples to get a better idea of the general characteristics of the rock type.

Example A
Example B
Example C


Laboratory Manual for Earth History Copyright © by kpanchuk. All Rights Reserved.

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