Name/Title
Limb CastEntry/Object ID
78.61.11Description
Assemblage Zone: calcareous sediments
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Family: Unknown
Genus:
Common Name: Limbcast
Age:
Location data: 'Green Limbcast Beds', Central OR
Description: (Delmar) Limbcast. The agate while in liquid form filled in area where lava had burned the wood out. Piece resembles Hampton Butte limbcast, and is in various shades of blue-green resembling moss, in a white filler with several crystallized holes.
Type of Fossils Present: Plants
Fracture: conchoidal
Grain Size: Fine
Hardness: 7 Quartz
Lithofacies: Volcanic Ash / lake sedim
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: microcrtystalline
Variety: Petrified woods ar hydrous microcrystalline varieties of quartz that can be generally termed as chalcedony .Collection
Petrified Wood CollectionAcquisition
Accession
78.61Source or Donor
Delmar Smith Limb Cast CollectionAcquisition Method
DonationDimensions
Height
6-13/16 inWidth
3/16 inLength
5-5/16 inDimension Notes
Dimensions taken at widest pointsLocation
Location
Shelf
CS-I-3Room
Curation StorageBuilding
Crater Rock MuseumDate
January 31, 2024
