Name/Title
Douglas FirEntry/Object ID
05.58.142Description
Assemblage Zone: sedimentary
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Pinaceae
Genus: Pseudotsunga
Common Name:Douglas Fir
Age: Mid Miocene
Location data: Zimmerman Ranch, McDermitt, Oregon
Description: Small, short branch, reddish-orange on the outside with tan, beige and black outer band with a dark spot in the center. Growth rings are visible on outer band.
Type of Fossils Present: Plants
Fracture: conchoidal
Grain Size: Fine
Hardness: 7 Quartz
Luster: Glassy
Occurrence: Silicified wood, which is the fossilization and/or opalization of organic woody matter by the deposition 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 or volcanic related mudflow. The organic material in the wood is then replaced by silica, other minerals determined the colors of the petrified wood.
Pressure: Moderate
Rock Color: Medium
Rock Origin: Post-depositional
Rock Type: Sedimentary
Specific Gravity: 2.6
Surface Process: Not apparent
Streak: white
Temperature: Low
Texture: microcrystalline
Variety: Petrified wood is hydrous microcrystalline variety of quartz that can be defined in general term of chalcedony or opalizationCollection
Petrified Wood CollectionOther Names and Numbers
Other Number
Other Number: 05.58.142Dimensions
Width
1-1/2 inDepth
2-1/2 inLength
2 inDimension Notes
Dimension taken at widest pointsLocation
Location
Display Case
PW-2Room
Petrified Wood RoomBuilding
Crater Rock MuseumCategory
ExhibitMoved By
Jillian Mather KettleyDate
January 16, 2025Notes
Inventory/Locating
