Name/Title
SycamoreEntry/Object ID
78.58.130Description
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, Clarno Formation, Teeter Ranch in Post (just east Prineville), Oregon, USA
Description: Delmar describes this specimen as a piece of petrified wood from Prineville, Oregon (central oregon) a variety of "sycamore". Polished side shows grey-brown wood with black blotches. Probably from oligocene epoch, (tertiary period, cenozoic era)
Walt Wright 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 which Delmar was fairly close.
Size: 3.500"x3.500"x.675"
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: 1978.58.130Dimensions
Width
3-1/2 inDepth
11/16 inLength
3-1/2 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 