Petrified Wood

Object/Artifact

-

Crater Rock Museum

Name/Title

Petrified Wood

Entry/Object ID

2008.1.13

Description

Assemblage Zone: sedimentary Chemical Composition: Si O2 Crystal System: Hexagonal Description: Petrified wood slab Genus: Pinus Common Name: Pine Age: Oligocene about 25 to 35 million years ago Location data: John Day Formation, Post, Crook County, Oregon, USA Description: Large polished slab of a complete round colors mostly browns with tan, white and red. Growth ring can be clearly seen. Size: Left 9.5 x 7.25 x 3.5 right 10 x 8 x 3.5 Type of Fossils Present: Plants Grain Size: Fine Hardness: 7 Quartz Lithofacies: ash-flow tuffs Luster: Glassy Occurrence: Silicified wood, which is the fossilization and opalization of organic woody matter by the deposation of SiO2 in a anaerobic environment to prevent decay. This means that the wood must somehow be buried in an oxygen free enviroment, possibly in the silt-laden river or the bottom of a lake or buried by volcanic ash. Pressure: Low-Moderate Rock Color: Medium Rock Origin: Terrestrial Rock Type: Sedimentary Specific Gravity: 2.6 Surface Process: Not apparent Temperature: Low Texture: microcrystaline Variety: Petrified woods here are hydrous microcrystalline variety of quartz that can be generally termed as chalcedony or opal.

Collection

Oren Kellenbeck Collection

Acquisition

Accession

2008.1

Source or Donor

Oren Kellenbeck Collection

Acquisition Method

Gift

Other Names and Numbers

Other Number

Other Number: 2008.1.13

Dimensions

Dimension Notes

Dimension taken at widest points

Location

Location

Shelf

CS-F-5

Room

Curation Storage

Building

Crater Rock Museum

Category

Storage

Moved By

Curator

Date

February 16, 2024