Name/Title
ElmEntry/Object ID
07.58.85Description
Assemblage Zone: lake sediments & debris
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Ulmaceae
Genus: Ulmus
Common name: Elm
Age: Miocene
Location data: Black Rock Desert, Humbolt County Nevada, USA
Description: Slab is an incomplete round, shows growth rings Colors: Black, beige, tan to yellowish tones
Size: diameter 4" x 2 1/2"
Type of Fossils Present: Plants
Fracture: conchoidal
Grain Size: Fine
Hardness: 7 Quartz
Lithofacies: rhyolite volcanic flows
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 volcanic related mudflow. The organic material is then replaced by (SiO2) silica, 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
Temperature: Low
Texture: microcrystalline
Variety: Petrified woods ar hydrous microcrystalline varieties of quartz that can be generally termed as chalcedony .Collection
Petrified Wood CollectionAcquisition
Accession
07.58Source or Donor
Petrified Wood CollectionAcquisition Method
DonationOther Names and Numbers
Other Number
Other Number: 2007.58.85Dimensions
Width
3 inDepth
2-1/2 inLength
4 inDimension Notes
Dimension taken at widest pointsLocation
Location
Shelf
top shelf on right, top shelf on rightWall
right - southRoom
Wood roomBuilding
Mentzer Hall - Petrified Wood RoomCategory
PermanentMoved By
Catherine BoydDate
March 6, 2008Location
Container
RightDrawer
Top ShelfShelf
RightCabinet
Case #101Wall
South wallBuilding
Mentzer Hall - Petrified Wood RoomCategory
Permanent
