Name/Title
Petrified WoodEntry/Object ID
78.58.457Description
Assemblage Zone: sedimentary
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Petrified Wood slab
Museum location: Case #105 bottom shelf in the center shelf
Family: Proteacea
Genus: Platanus
Species; Platanaceae
Common name: Sycamore
Age: LateTriassic
Location data: Clarno Formation, Post, Oregon
Description: Complete round slab black with white agate
Size: diameter: 19" x 14.5 thickness: 1"
Type of Fossils Present: Plants
Grain Size: Fine
Hardness: 7 Quartz
Lithofacies: subtropical forest
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: 78.58.457Dimensions
Width
1/2 inLength
15 inDiameter
11-1/4 inDimension Notes
Dimensions taken at widest pointsLocation
Location
Shelf
bottom centerCabinet
case #105Wall
northRoom
Wood Room, Mentzer HallBuilding
Crater Rock MuseumCategory
Permanent