Palm

Object/Artifact

-

Crater Rock Museum

Name/Title

Palm

Entry/Object ID

05.58.236

Description

Assemblage Zone: river sediments Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Palmae Genus: Palmoxylon Common name: Palm Age: Eocene Location data: Payne Cliff formation, Sams Valley, Jackson County, Oregon. Description: Polished slab face is in colors of browns and tans with a black center. Type of Fossils Present: Plants Fracture: conchoidal Grain Size: Fine Hardness: 7 Quartz Lithofacies: Subtropical 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 related volcanic mudflow. The organic material in the wood is then replaced by silica (SiO2), 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 Streak: white Temperature: Low Texture: Mircrocrystalline Variety: Petrified woods here are hydrous microcrystalline variety of quartz that can be generally termed as chalcedony.

Collection

Petrified Wood Collection

Acquisition

Accession

05.58.

Other Names and Numbers

Other Number

Other Number: 2005.58.236

Dimensions

Width

5-3/4 in

Depth

1/2 in

Length

4-7/8 in

Dimension Notes

Dimension taken at widest points

Location

Location

Container

Center

Drawer

3rd Shelf

Shelf

Right

Cabinet

Case #107

Wall

North Wall

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent