Name/Title
SycamoreEntry/Object ID
05.58.07Description
Assemblage Zone: sediments
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Platanaceae
Genus: Platanus
Common Name: Sycamore
Age: Eocene
Location data: Payne Cliff Formation, Sams Valley, Jackson County, Oregon, USA
Description: Polished face shows pink, tan and beige tones with some clear agate spots, center of a round rays and grain are apparent.
Type of Fossils Present: Plants
Fracture: conchoidal
Grain Size: Fine
Hardness: 7 Quartz
Lithofacies: nearshore environments
Luster: Glassy
Occurrence: Late Eocene nearshore environments are represented by conglomerates and sand of the Payne Cliffs formation exposed in a northwest trending belt along the Bear Creek Valley near Ashland. Grading upward into ash, tuffs and lava flows, the Payne also record the earliest volcanic activity of the Western Cascades and the deposition was primarilyby a extensive braided river which flowed to the north.
Pressure: Moderate
Rock Color: Medium
Rock Origin: Post-depositional
Rock Type: Sedimentary
Specific Gravity: 2.6
Surface Process: Not apparent
Streak: white
Temperature: Low to moderate
Texture: Mircrocrystalline
Variety: Petrified woods here are hydrous microcrystalline variety of quartz that can be generally termed as chalcedony.
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 related volcanic mudflow. The organic material in the wood is then replaced by silica (SiO2), other minerals determined its colors.Collection
Petrified Wood CollectionAcquisition
Accession
05.58Source or Donor
Petrified Wood CollectionAcquisition Method
DonationOther Names and Numbers
Other Number
Other Number: 2005.58.07Dimensions
Width
2-1/4 inDepth
1-1/2 inLength
3-1/2 inDimension Notes
Dimension taken at widest pointsLocation
Location
Display Case
PW-7Room
Petrified Wood RoomBuilding
Crater Rock MuseumCategory
ExhibitMoved By
Jillian Mather KettleyDate
January 22, 2025Notes
Inventory/ location
