Name/Title
Petrified WoodEntry/Object ID
78.58.214Description
Assemblage Zone: sedimentary
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family:
Genus:
Common Name:
Age: Oligocene Epoch (Tertiary Period, Cenozoic Era)
Location data: Sweethome, OR
Description: (Delmar) Petrified wood. Shape resembles a horse's head. Polished side shows dark brown and black wood (unusual for Sweethome wood), with cream-colored wood at edge. Several surface cracks seen. Piece is cut with the grain.
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
DonationDimensions
Height
8-3/16 inWidth
1-3/16 inLength
7-3/16 inDimension Notes
Dimension taken at widest pointsLocation
Location
Shelf
CS-G-4Room
Curation StorageBuilding
Crater Rock MuseumCategory
StorageMoved By
Jillian Mather KettleyDate
February 8, 2024
