With a Geological Twist

The San Francisco Peaks

In northern Arizona, outside the city of Flagstaff, the San Francisco Peaks lie near the centre of a large volcanic field with more than 600 vents. The tallest point in Arizona, Humphreys Peak (3851 m) is part of an eroded stratovolcano. Volcanic activity began approximately 6 million years ago, near the town of Williams. The latest eruption occurred about 100 years ago at Sunset Crater, which is located a few kilometres east of the San Francisco Peaks. Rock types range from rhyolite obsidians to basalts. The obsidians form lava domes and the basalts, cinder cones and lava flows.
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Volcanic Petrology
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San Francisco Peaks, Arizona

Magmatic Histories

This web page provides access to e-manuscripts describing inferred magmatic histories that culminated in volcanic eruptions.

Clicking a button on the left takes you to a page where you can download three Portable Document Format files (*.pdf). There *.pdf files can be read on the screen or printed. Press the Navigation Button in the top panel to learn how to arrange the files to efficiently read them on the screen. To read and print the documents, your computer will have to have Adobe's Acrobat Reader. Adobe Acrobat Reader is furnished free of charge and you can obtain it by clicking on the following button:

Adobe Reader

The electronic documents can be downloaded to your computer by clicking the right mouse button when the cursor is over the underlined text fragments that link to the files. Clicking the left button on the links opens the files in Adobe Acrobat Reader.