Name/Title
OakEntry/Object ID
78.58.83Description
Assemblage Zone: Sedimentary
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Fagaceae
Genus: Quercus
Common name: Oak
Age: Miocene
Location data: Deschutes Canyon, Oregon
Formation: Wanapum Basalt
Description: A piece of oak wood varying in thickness from eastern Oregon. Colors: Beige center containing several dark colored cracks, graduating to areas of greys, brown, tans, blacks. Growth lines very apparent. Growth rings less obvious.
Size: 6.00"x 6.00"x .250"
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 environment, 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
DonationDimensions
Width
6 inDepth
1/4 inLength
6 inDimension Notes
Dimension taken at widest pointsLocation
Location
Display Case
PW-1Room
Petrified Wood RoomBuilding
Crater Rock MuseumCategory
ExhibitMoved By
Jillian Mather KettleyDate
January 14, 2025Notes
Inventory/Locating
