Name/Title
Petrified WoodEntry/Object ID
07.58.72Description
Assemblage Zone: sedimentary
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Common Name: Petrified Wood
Family: Araucariaceae
Genus: Araucarioxylon
Species: Arizonicum
Common name: Araucaria or Monkey Puzzle
Age: Late Triassic about 215 million years old
Location data: Chinle Formation, Arizona, USA
Description: Medium size stump, unfinished, cut but not ground flat so you can still see the saw marks, colors are typical red, black, and some brown tones, growth rings are apparent but it is not a complete round
Size: 9.750"x 7.50"x 5.750"
Type of Fossils Present: Plants
Fracture: conchoidal
Grain Size: Fine
Hardness: 7 Quartz
Lithofacies: Fluvial System
Luster: Glassy
Occurrence: Silicified wood, which is the fossilization and/or 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 volcanic related mudflow. The organic material in the wood is then replaced by silica, other minerals determined the colors of the petrified wood.
Pressure: Low-Moderate
Rock Color: Medium
Rock Origin: Post-depositional
Rock Type: Sedimentary
Specific Gravity: 2.6
Surface Process: Not apparent
Streak: white
Temperature: Low
Texture: microcrystaline
Variety: Petrified wood is hydrous microcrystalline variety of quartz that can be defined in general term of chalcedonyCollection
Petrified Wood CollectionAcquisition
Accession
07.58Source or Donor
Petrified Wood CollectionAcquisition Method
DonationOther Names and Numbers
Other Number
Other Number: 2007.58.72Dimensions
Width
7-1/2 inDepth
5-3/4 inLength
9-3/4 inDimension Notes
Dimension taken at widest pointsLocation
Location
Drawer
RightShelf
BottomCabinet
Case#103(a)Wall
EastBuilding
Mentzer Hall - Petrified Wood RoomCategory
Permanent
