Bay Laurel

Object/Artifact

-

Crater Rock Museum

Name/Title

Bay Laurel

Entry/Object ID

78.58.125

Description

Assemblage Zone: Sedimentary Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Lauraceae Genus: Umbellularia Common Name: Bay Laurel Age: Eocene Location data: Jackson County, Oregon Roxy fm. Description: Thick slice of petrified wood from Eagle Point, Oregon. Polished side shows brown and beige wood, with some blue and white silicate filled cracks running through the center. Several cracks (some surface) are present. Growth rings are present. Size: 4.500"x 4.500"x 1.125" Type of Fossils Present: Plants Fracture: conchoidal Grain Size: Fine Hardness: 7 Quartz 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 Collection

Acquisition

Accession

78.58

Source or Donor

Delmar Smith Petrified Wood Collection

Acquisition Method

Donation

Other Names and Numbers

Other Number

Other Number: 78.58.125

Dimensions

Width

4-1/2 in

Depth

1-1/8 in

Length

4-1/2 in

Dimension Notes

Dimensions taken at widest points

Location

Location

Container

Left

Drawer

Top Shelf

Shelf

Center

Cabinet

Case #107

Wall

North Wall

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent