Araucaria

Object/Artifact

-

Crater Rock Museum

Name/Title

Araucaria

Entry/Object ID

78.58.27

Description

Assemblage Zone: sedimentary Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Araucaiaceae Genus: Araucarioxylon Species; Arizonicum Common name: Araucaria or Monkey Puzzle Age: LateTriassic Location data: Chinle Formation, Spurlock Ranch, Arizona USA Description: Delmar describes this pieces as one slice of petrified wood cut and polished from Arizona. Probably of the Chinle Formation dating to the Trassic period. The iron minerals give this piece it's reddish-pink color. Also beige, browns and purple colors. Size: 10.500"x 6.00"x .750" Type of Fossils Present: Plants Grain Size: Fine Hardness: 7 Quartz Lithofacies: Fluvial System 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

Acquisition

Accession

78.58

Source or Donor

Delmar Smith Petrified Wood Collection

Acquisition Method

Donation

Other Names and Numbers

Other Number

Other Number: 1978.58.27

Dimensions

Width

6 in

Depth

3/4 in

Length

10-1/2 in

Dimension Notes

Dimensions taken at widest points

Location

Location

Container

Left

Drawer

2nd Shelf

Shelf

Center

Cabinet

Case #103

Wall

East Wall

Building

Mentzer Hall- Petrified Wood Room

Category

Permanent

Location

Room

Petrified Wood Room

Building

Crater Rock Museum

Category

Permanent