Ash

Object/Artifact

-

Crater Rock Museum

Name/Title

Ash

Entry/Object ID

05.58.213

Description

Assemblage Zone: sedimentary Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Oleaceae Genus: Fraxinus Common name: Ash Age: Lower Oligocene Location data: Scio, Oregon Mehama fm. Description: Doug Foster describes this specimen as being a butt cut slab from a round trunk. Tan and brown-reddish tan on the outside and on the bark side. Black, tan, cream and reddish-tan on the inside. Type of Fossils Present: Plants Grain Size: Fine Hardness: 7 Quartz Lithofacies: flood basalts 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

05.58.

Other Names and Numbers

Other Number

Other Number: 05.58.213

Dimensions

Width

11 in

Depth

1-1/2 in

Length

10 in

Dimension Notes

Dimensions taken at widest points

Location

Location

Container

Left

Drawer

Bottom

Shelf

Left

Cabinet

Case #108

Wall

North Wall

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent