Bay Laurel

Object/Artifact

-

Crater Rock Museum

Name/Title

Bay Laurel

Entry/Object ID

78.58.306

Description

Assemblage Zone: sedimentary Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Laureaceae Genus: Umbellulia Common name: Bay Laurel Age: Eocene to Miocene Location data: Long Butte, Eagle Point, Jackson County, Oregon Fm.: Roxy Description: Delmar describes this piece as a thick slice of petrified wood in which the polished side shows wood in beiges, golds, browns and some black with grey , white and crystalline silicate fillers. There are two large silicate cracks seen. Growth rings are visible. Possibly a non-tropical tree. Doug Foster describes this specimen as Laurel-like. Size: Diameter: 5" Thickness: 1/2" Type of Fossils Present: Plants Grain Size: Fine Hardness: 7 Quartz 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 Collection

Acquisition

Accession

78.58

Source or Donor

Delmar Smith Petrified Wood Collection

Acquisition Method

Donation

Other Names and Numbers

Other Number

Other Number: 1978.58.306

Dimensions

Width

1/2 in

Length

15 in

Diameter

11-1/4 in

Dimension Notes

Dimensions taken at widest points

Location

Location

Container

Left

Drawer

Top Shelf

Shelf

Right

Cabinet

Case #103

Wall

East Wall

Building

Mentzer Hall- Petrified Wood Room

Category

Permanent