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1
Petrified Forest NP
GLY 3164,
Spring 2006
2
Park Map
• Park is basically two units
• Painted Desert is to the North
• Petrified Forest is in the south
3
Multi-Colored Ash Layers
• In the Painted Desert Region
4
Petrified Logs
• Volcanic ash is visible in background• Along Straight Logs Trail
5
Painted Desert Overlook
• Spectacular view of the extremely colorful Chinle formation, exposed in the Painted Desert
6
Painted Desert
• Note spacing of vegetation, indicating very arid conditions
7
Painted Desert View
8
Colorful Logs
• Small amounts of impurities in silica create very colorful displays
9
Petrified Log Video
• Close-up of the log, showing excellent preservation of the log structure
• Double-click to play video
10
Log in the Blue Mesa Region
• Blue Mesa is composed of bentonite clay, a weathering product of volcanic ash
• Clay is very easily eroded
11
Blue Mesa Overview
• Differential Erosion
12
Log on Pedestal
• In the Blue Mesa Region
13
Lithodendron Wash
• Small objects in the basin are petrified logs
14
Petrified Logs
• Differential erosion uncovers the locks, because they are much more resistant to weathering than the soft Chinle formation in which they are found
15
Petrified Log in Painted Desert
• Log has helped to preserve the easily eroded ash underneath it
16
Agate Bridge
• Agate bridge has now been supported by the NPS to protect it, but originally spanned a small dry wash
17
Giant Logs
• Along the Giant Logs trail
18
Broken Log
• Many large logs break at regular intervals
19
Petrified Forest Logs
• Montage of video clips
20
Newspaper Rock
• In the Painted Desert section
• Rock writing was sometimes used to leave messages
21
Pictoglyphs
• Rock is dark colored because of desert varnish• Scraping rock reveals the true rock color, and makes writing or
drawing possible • Many such writings were left by prehistoric Native Americans