Name/Title
SchilderiaEntry/Object ID
78.58.446Description
Assemblage Zone: sedimentary
Chemical Composition: Si O2
Crystal System: Hexagonal
Description: Genus: Schidera
Species: Adamanica
Common name: Schilderia
Age: Late Triassic
Location data: Chinle Formation, Arizona, USA
Delmar describes this pieces as a slice of petrified wood , "Adamanaca Schilderia Pine" from Holbrook, Arizona. Varies in thickness. Piece is polished on one side and appears to be lacquered on the other. Colors: wood in dark brown, greys, black, tan and oranges. Rays seen. Several crystalline cracks seen, one opening visible. Probably from Jurassic period (Mesozoic era)
Size: 6.250"x 9.500"x .675"
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: 1978.58.446Dimensions
Width
9-1/2 inDepth
11/16 inLength
6-1/4 inDimension Notes
Dimensions taken at widest pointsLocation
Location
Display Case
PW-10Room
Petrified Wood RoomBuilding
Crater Rock MuseumCategory
ExhibitMoved By
Jillian Mather KettleyDate
September 19, 2025Notes
Location added when performing inventory 
