Name/Title
Petrified WoodEntry/Object ID
78.58.465Description
Assemblage Zone: Sedimentary
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Fagaceae
Genus: Quercus
Common Name: Oak
Age: Pliocene
Location data: Deschutes Canyon, Oregon
Description: Thick slice of petrifed wood from along the Deschutes River. Polished side shows wood in beige, gold greys and browns with rays and a wood pattern that resembles growth rings. Two centers present. Some open holes seen. Unpolished side shows some laquered areas.
Size: 9.750"x 14.750" .500"
Type of Fossils Present: Plants
Fracture: conchoidal
Grain Size: Fine
Hardness: 7 Quartz
Luster: Glassy
Occurrence: Silicified wood, which is the fossilization and 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 related volcanic mudflow. The organic material in the wood is then replaced by silica (SiO2), other minerals determined its colors.
Pressure: Low-Moderate
Rock Color: Medium
Rock Origin: Post-depositional
Rock Type: Sedimentary
Specific Gravity: 2.6
Surface Process: Not apparent
Streak: white
Temperature: Low
Texture: Mircrocrystalline
Variety: Petrified woods here are hydrous microcrystalline variety of quartz that can be generally termed as chalcedony.Collection
Petrified Wood CollectionAcquisition
Accession
78.58Source or Donor
Delmar Smith Petrified Wood CollectionAcquisition Method
DonationOther Names and Numbers
Other Number
Other Number: 78.58.465Dimensions
Width
14-3/4 inDepth
1/2 inLength
9-3/4 inDimension Notes
Dimension taken at widest pointsLocation
Location
Display Case
PW-2Room
Petrified Wood RoomBuilding
Crater Rock MuseumCategory
ExhibitMoved By
Jillian Mather KettleyDate
January 29, 2025Notes
Added current location
