Name/Title
Sequoia "Tangent Cut"Entry/Object ID
78.58.160Description
Assemblage Zone: sedimentary
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Cupressaceae
Genus: Sequoia
Common name: Redwood
Age: Eocene / Oligocene
Location data: Columbia River Basalt Group, Clarno Formation, Teeter Ranch in Post (just east Prineville), Oregon, USA
Description: Delmar describes this specimen as a thick slice of petrified wood (redwood) from Cal Valley, Oregon (central oregon) a variety of "sycamore". Polished side shows that the piece has beeen cut with the grain with a beautiful design to the grain in tans, beiges, and browns. Green felt has been glued on the back. Probably from oligocene epoch, (tertiary period, cenozoic era).
Size:7.750"x 4.125"x .375"
Type of Fossils Present: Plants
Grain Size: Fine
Hardness: 7 Quartz
Luster: Glassy
Occurrence: Silicified wood, which is the fossilization and opalization of organic woody matter by the deposation 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.
Pressure: Low-Moderate
Rock Color: Medium
Rock Origin: Terrestrial
Rock Type: Sedimentary
Specific Gravity: 2.6
Surface Process: Not apparent
Temperature: Low
Texture: microcrystalline
Variety: Petrified woods here are hydrous microcrystalline variety of quartz that can be generally termed as chalcedony or opal.Collection
Petrified Wood CollectionAcquisition
Accession
78.58Source or Donor
Delmar Smith Petrified Wood CollectionAcquisition Method
DonationOther Names and Numbers
Other Number
Other Number: 1978.58.160Dimensions
Width
4-1/8 inDepth
3/8 inLength
7-3/4 inDimension Notes
Dimensions taken at widest pointsLocation
Location
Display Case
PW-12Room
Petrified Wood RoomBuilding
Crater Rock MuseumCategory
ExhibitMoved By
Jillian Mather KettleyDate
September 19, 2025Notes
Location added when performing inventory
