Sycamore

Object/Artifact

-

Crater Rock Museum

Name/Title

Sycamore

Entry/Object ID

78.58.295

Description

Assemblage Zone: sedimentary Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Platanaceae Genus: Platanus Common name: Sycamore Age: Oligocene in Tertiary Location data: Post, Oregon Mehama fm. Description: Delmar describes this specimen as a petrified limb from Prineville, Oregon. The polished end shows black wood with some grey agate. A beige spot is to one side. Growth rings are visible. Walt Wright claims this specimen is from the Tecter Ranch in Post, Oregon. Size: 10.500"x 10.500"x .675" 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

78.58

Source or Donor

Delmar Smith Petrified Wood Collection

Acquisition Method

Donation

Other Names and Numbers

Other Number

Other Number: 78.58.295

Dimensions

Width

10-1/2 in

Depth

11/16 in

Length

10-1/2 in

Dimension Notes

Dimensions taken at widest points

Location

Location

Drawer

Top Shelf

Shelf

Center

Cabinet

Case #108

Wall

North Wall

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent