Petrified Wood

Object/Artifact

-

Crater Rock Museum

Name/Title

Petrified Wood

Entry/Object ID

07.58.76 (B)

Description

Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Araucariaceae Genus: Aravacariotylon Common Name: Arcacaria Age: Late Triassic (about 215 million years old) Location data: Dobell-Patton dig site in Arizona USA Description: 2 large polished slabs with the face colors ranging from brown, tan, beige, rust and red, outer side is mostly a tanish - beige color. No growth rings are apparent and the outer part of the face appears to be like a medium grain sandstone, while the inner part has the color and the wood appearance Size: 16.00"x 12.750"x 1.750" Type of Fossils Present: Plants Fracture: conchoidal Grain Size: Fine Hardness: 7 Quartz 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: Light Rock Origin: Post-depositional Rock Type: Sedimentary Specific Gravity: 2.6 Surface Process: Not apparent Temperature: Low Texture: medium grain to a Microcrystalline texture Variety: Petrified woods ar hydrous microcrystalline varieties of quartz that can be generally termed as chalcedony or opalized .

Collection

Petrified Wood Collection

Acquisition

Accession

07.58

Source or Donor

Petrified Wood Collection

Acquisition Method

Donation

Other Names and Numbers

Other Number

Other Number: 2007.58.76 (B)

Dimensions

Width

12-3/4 in

Depth

1-3/4 in

Length

16 in

Dimension Notes

Dimension taken at widest points

Location

Location

Shelf

bottom right, bottom right

Wall

right - south

Room

Wood room

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent

Moved By

Catherine Boyd

Date

March 6, 2008

Location

Drawer

Left

Shelf

Bottom

Cabinet

Case #104(a)

Wall

East

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent