Petrified Redwood

Object/Artifact

-

Crater Rock Museum

Name/Title

Petrified Redwood

Entry/Object ID

07.58.67

Description

Assemblage Zone: nonmarine volcanic sedime Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Cupressaceae Genus: Sequoia Common Name: Redwood Age: Oligocene to early Miocene Location data: John Day Formation, Alex McDonald Ranch near Ashwood, Oregon USA Description: The polished face shows tans, browns and black with gray -blue agate, some grains can be seen, and the outer is a beige chalky white. Size: 15.250"x 10.00"x 6.00" Type of Fossils Present: Plants Fracture: conchoidal Grain Size: Fine Hardness: 7 Quartz Lithofacies: Volcaniclastic Luster: Glassy Occurrence: Like petrified wood, limb cast are created in much the same manner. Volcanic ash or silica-rich sediment buries a tree limb, the limb decays, leaving behind an open void. This void works as a mold that fills with amorphous silica that has percolated through the surrounding rock. Once microamorphous silica has filled the mold and the crystallization process to a (quartz)chalcedony or opal is complete, the result is a siliceous rock with the same exterior markings as the original limb. Pressure: Low-Moderate Rock Color: Dark Rock Origin: Post-depositional Rock Type: Sedimentary Specific Gravity: 2.6 Surface Process: Not apparent Temperature: Low Texture: Microcrystalline Variety: Petrified woods ar hydrous microcrystalline varieties of quartz that can be generally termed as chalcedony or opalized .

Collection

Petrified Wood Collection

Acquisition

Accession

07.58

Source or Donor

Petrified Wood Collection

Acquisition Method

Donation

Other Names and Numbers

Other Number

Other Number: 2007.58.67

Dimensions

Width

10 in

Depth

6 in

Length

15-1/4 in

Dimension Notes

Dimension taken at widest points

Location

Location

Shelf

bottom right, bottom right

Wall

right - south

Room

Wood room

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent

Moved By

Catherine Boyd

Date

March 6, 2008

Location

Shelf

bottom right, bottom right

Wall

right - south

Room

Wood room

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent

Moved By

Catherine Boyd

Date

March 6, 2008

Location

Shelf

Bottom

Cabinet

Case #105(c)

Wall

North

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent