Name/Title
LaurelEntry/Object ID
07.58.107Description
Assemblage Zone: Lake sediments
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Lauraceae
Genus:
Common name: Laurel
Age: Oligocane
Location data: Eagle Point, Oregon
Description: Limb cut with a polished end. Beige and tan outer areas gradually turning black towards the center. Growth rings are visible with agatized spotting throughout the specimen.
Laurel. Genus: Umbellularia "(The white dots on the cut face and the white "rods" on the sides show where vessels rotted out and the resulting voids were later filled in with chalcedony.)"
Size: 4.250"x 3.250"x 2.00"
Type of Fossils Present: Plants
Fracture: conchoidal
Grain Size: Fine
Hardness: 7 Quartz
Lithofacies: Volcanic ash
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: microcrystalline
Variety: Petrified woods ar hydrous microcrystalline varieties of quartz that can be generally termed as chalcedony .Collection
Petrified Wood CollectionAcquisition
Accession
07.58Source or Donor
Petrified Wood CollectionAcquisition Method
DonationOther Names and Numbers
Other Number
Other Number: 07.58.107Dimensions
Width
3-1/4 inDepth
2 inLength
4-1/4 inDimension Notes
Dimension taken at widest pointsLocation
Location
Container
CenterDrawer
Bottom / Front RowShelf
LeftCabinet
Case #107Wall
North WallBuilding
Mentzer Hall - Petrified Wood RoomCategory
Permanent
