Name/Title
AraucariaEntry/Object ID
78.58.448Description
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, Utah USA
Delmar description: A 7/8" (2.2 cm.) thick slice of petrified wood from Utah. Polished side shows black wood with red stain and some grey silicate, some grey wood seen. Delmar believe this piece was from Jurassic but it is actually from the late triassic (Mesozoic era)
Size: 4.125"x 4.500"x .875"
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 CollectionAcquisition
Accession
78.58Source or Donor
Delmar Smith Petrified Wood CollectionAcquisition Method
DonationOther Names and Numbers
Other Number
Other Number: 1978.58.448Dimensions
Width
4-1/2 inDepth
7/8 inLength
4-1/8 inDimension Notes
Dimensions taken at widest pointsLocation
Location
Container
LeftDrawer
Top ShelfShelf
CenterCabinet
Case #103Wall
East WallBuilding
Mentzer Hall- Petrified Wood RoomCategory
PermanentLocation
Shelf
Top center on the ri, Top center on the riWall
EasternRoom
Wood Room, Mentzer HallBuilding
Crater Rock MuseumCategory
Permanent
