Name/Title
SycamoreEntry/Object ID
78.58.199Description
Assemblage Zone: sedimentary
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Platanaceae
Genus: Platanus
Common name: Sycamore
Age: Eocene
Location data: Columbia River Basalt Group, Teeter Ranch in Post (just east Prineville), Oregon, USA
Clarno Formation,
Description: Delmar describes this specimen as a limb of petrified wood from Sweethome, Oregon (west central oregon) a variety of "sycamore". Polished end shows greys, black, some brown and beige. Delmar believed the specimen is of the tropical variety and was probably from the Jurassic period, mesozoic era.
Walt Wright or Doug Foster later identifies this specimen as being from the Teeter Ranch in Post Oregon which is just east of Prineville in central oregon, the piece has also correctly been identified as 'sycamore" from the miocene epoch.
Size: 6.250"x 3.125"x 1.750"
Type of Fossils Present: Plants
Grain Size: Fine
Hardness: 7 Quartz
Lithofacies: flood basalts
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: 1978.58.199Dimensions
Width
3-1/8 inDepth
1-3/4 inLength
6-1/4 inDimension Notes
Dimensions 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
