Name/Title
SequoiaEntry/Object ID
78.58.132Description
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Taxodium
Genus: Sequoia
Common Name: Metasequoia
Age: Oligocene
Location data: John Day Formation, Ochoco Dam, Prineville, Oregon USA
Description: Rectangular slice of pertified wood from Ochoco Dam, Prineville, Oregon (Central Oregon): varriety is possibly a juniper. Polished side shows wood in beiges yellows and tans. Cinnabar red has set in throughtout the piece. Some cracks are crystalline filled. The piece is cut with the grain. Probably from Oligecene epoch.
Walt Wright later identified this piece as Metasequoia from the Oligocene
Size: 2.375"x 8.750"x .125"
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 CollectionAcquisition
Accession
78.58Source or Donor
Delmar Smith Petrified Wood CollectionAcquisition Method
DonationOther Names and Numbers
Other Number
Other Number: 1978.58.132Dimensions
Width
8-3/4 inDepth
1/8 inLength
2-3/8 inDimension Notes
Dimension taken at widest pointsLocation
Location
Display Case
PW-8Room
Petrified Wood RoomBuilding
Crater Rock MuseumCategory
ExhibitMoved By
Jillian Mather KettleyDate
May 28, 2025Notes
Location update
