Sequoia Tangent Cut

Object/Artifact

-

Crater Rock Museum

Name/Title

Sequoia "Tangent Cut"

Entry/Object ID

78.58.160

Description

Assemblage Zone: sedimentary Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Cupressaceae Genus: Sequoia Common name: Redwood Age: Eocene / Oligocene Location data: Columbia River Basalt Group, Clarno Formation, Teeter Ranch in Post (just east Prineville), Oregon, USA Description: Delmar describes this specimen as a thick slice of petrified wood (redwood) from Cal Valley, Oregon (central oregon) a variety of "sycamore". Polished side shows that the piece has beeen cut with the grain with a beautiful design to the grain in tans, beiges, and browns. Green felt has been glued on the back. Probably from oligocene epoch, (tertiary period, cenozoic era). Size:7.750"x 4.125"x .375" 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: 1978.58.160

Dimensions

Width

4-1/8 in

Depth

3/8 in

Length

7-3/4 in

Dimension Notes

Dimensions taken at widest points

Location

Location

Container

Left

Drawer

Top Shelf

Shelf

Left

Cabinet

Case #101

Wall

South wall

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent