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“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Holbrook in Navajo County, Arizona — The American Mountains (Southwest)
 

From Wood to Stone

 
 
From Wood to Stone Marker image. Click for full size.
By Denise Boose, September 2, 2013
1. From Wood to Stone Marker
Photo Caption:
Forest devastation after the 1980 eruption of Mount Saint Helens in the state of Washington provided at least two requirements for the petrification process – wood and silica – producing sediment (in this case volcanic ash).
Inscription. Approximately 225 million years ago, during the Triassic Period, a floodplain existed here – littered with fallen trees. Periodic flooding buried the logs beneath layers of silt. Over time, silica-laden waters filtered through these deposits and petrified the wood by encasing the trees’ organic material with minerals.

Iron oxides give petrified wood its distinctive red, yellow, and orange hues; manganese oxides produce blues, purples and deep blacks, while the original carbon produces the shades of gray. Centuries of erosion washed away concealing sediment deposits to expose these remnants of Triassic woodlands.

Could today’s woodlands become petrified forest of tomorrow? Geologic forces similar to those of the Triassic period still shape the Earth’s surface, and may create the preliminary conditions for future petrification.

Side Bar:
The processes that created petrified wood here ceased millions of years ago. Petrified wood and other fossils are irreplaceable resources to be cherished undisturbed.
 
Erected by Petrified National Forest Services.
 
Location. 34° 51.869′ N, 109° 47.46′ W. Marker is in Holbrook, Arizona, in Navajo County. Marker is on Petrified
From Wood to Stone Marker image. Click for full size.
By Denise Boose, September 2, 2013
2. From Wood to Stone Marker
Forest Road, on the right when traveling north. Click for map. Marker is in this post office area: Holbrook AZ 86025, United States of America.
 
Other nearby markers. At least 8 other markers are within 7 miles of this marker, measured as the crow flies. Triassic Landscape (within shouting distance of this marker); Jasper Forest (approx. 1.9 miles away); Agate Bridge (approx. 2 miles away); Stephen Tyng Mather (approx. 5.4 miles away); Pioneers of Paleontology (approx. 5.6 miles away); Agate House (approx. 5.7 miles away); Newspaper Rock Petroglyphs Archeological District (approx. 6.7 miles away); Newspaper Rock (approx. 6.8 miles away). Click for a list of all markers in Holbrook.
 
Categories. Natural FeaturesNatural ResourcesNotable Places
 
From Wood to Stone Marker image. Click for full size.
By Denise Boose, September 2, 2013
3. From Wood to Stone Marker
Petrified Wood image. Click for full size.
By Denise Boose, September 2, 2013
4. Petrified Wood
Petrified Wood image. Click for full size.
By Denise Boose, September 2, 2013
5. Petrified Wood
Petrified Wood image. Click for full size.
By Denise Boose, September 2, 2013
6. Petrified Wood
 
 
Credits. This page originally submitted on , by Denise Boose of Tehachapi, California. This page has been viewed 366 times since then and 9 times this year. Photos:   1, 2, 3, 4, 5, 6. submitted on , by Denise Boose of Tehachapi, California. • Syd Whittle was the editor who published this page. This page was last revised on June 16, 2016.
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