Name/Title
AraucariaEntry/Object ID
05.58.197Description
Assemblage Zone: sedimentary
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Araucariaceae
Genus: Araucarioxylon
Species: Arizonicum
Common Name: Araucaria or Monkey Puzzle
Age: Late Triassic
Location data: Chinle Formation, Arizona
Description: Polished face shows colors of white, orange, yellow, black, brown, grey, purple and pinkish tones, growth rings are apparent. The slab is a complete round
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 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: Medium
Rock Origin: Post-depositional
Rock Type: Sedimentary
Specific Gravity: 2.6
Surface Process: Not apparent
Streak: white
Temperature: Low
Texture: Microcrystalline
Variety: Petrified woods here are hydrous microcrystalline variety of quartz that can be generally termed as chalcedony.Collection
Petrified Wood CollectionAcquisition
Accession
05.58Source or Donor
Petrified Wood CollectionAcquisition Method
DonationOther Names and Numbers
Other Number
Other Number: 2005.58.197Dimensions
Width
10-1/2 inDepth
3/4 inLength
12 inDimension Notes
Dimension taken at widest pointsLocation
Location
Shelf
3rd right center, 3rd right centerWall
right - southRoom
Wood roomBuilding
Mentzer Hall - Petrified Wood RoomCategory
PermanentMoved By
Catherine BoydDate
March 6, 2008Location
Container
RightDrawer
2nd ShelfShelf
RightCabinet
Case #103Wall
East WallBuilding
Mentzer Hall - Petrified Wood RoomCategory
Permanent
