Name/Title
Tan OakEntry/Object ID
78.58.451Description
Assemblage Zone: sedimentary
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Fagaceae
Genus: Lithocarpus
Species: Densiflorus
Common Name: Tan Oak
Age: Oligocene
Location data: Long Mountain, Eagle Point, Oregon, USA
Roxy Ann Formation,
Description: Delmar 's Description: A 3/4" thick slice of a petrified wood from Long Mountain in Eagle Point, Jackson County Oregon. Polished side shows wood in dark browns, black and beiges with some orange staining. Numerous Grey and white silicate (agate) cracks. Piece has been broken and glued back together.
Size: 8.250"x 7.500"x .500"
Type of Fossils Present: Plants
Fracture: conchoidal
Grain Size: Fine
Hardness: 7 Quartz
Lithofacies: Tropical to subtropical
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 volcanic related mudflow. The organic material is then replaced by (SiO2) silica, 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
Temperature: Low
Texture: microcrtystalline
Variety: Petrified woods ar hydrous microcrystalline varieties 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: 1978.58.451Dimensions
Width
7-1/2 inDepth
1/2 inLength
8-1/4 inDimension Notes
Dimensions taken at widest pointsLocation
Location
Container
RightDrawer
2nd ShelfShelf
RightCabinet
Case#107Wall
North WallBuilding
Mentzer Hall - Petrified Wood RoomCategory
Permanent
