Petrified Wood

Object/Artifact

-

Crater Rock Museum

Name/Title

Petrified Wood

Entry/Object ID

78.58.386

Description

Assemblage Zone: Sedimentary Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Protopinaceae Genus: Woodworthia Species: Arizonica Common name: Woodworthia Age: Jurassic Period, Mesozoic Era Location data: Eastern Central Arizona, USA Description: Delmar describes this piece of petrified wood as a variety 'Woodworthia'. The polished side shows wood in brown, beige, pink, purple, black, and gray, some pale yellow with green cracks (copper) and crystal cracks. Size: 8.8"x 7.3"x 0.8" Type of Fossils Present: Plants Fracture: conchoidal Grain Size: Fine Hardness: 7 Quartz 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: Mircrocrystalline Variety: Petrified woods here are hydrous microcrystalline variety of quartz that can be generally termed as chalcedony.

Collection

Petrified Wood Collection

Acquisition

Accession

78.58

Source or Donor

Delmar Smith Petrified Wood Collection

Acquisition Method

Donation

Dimensions

Height

8-13/16 in

Width

13/16 in

Length

7-5/16 in

Dimension Notes

Dimension taken at widest points

Location

Location

Shelf

CS-F-1

Room

Curation Storage

Building

Crater Rock Museum

Category

Storage

Moved By

Curator

Date

February 21, 2024