Sycamore

Object/Artifact

-

Crater Rock Museum

Name/Title

Sycamore

Entry/Object ID

78.58.56

Description

Assemblage Zone: Sedimentary Chemical Composition: Si O2 Crystal System: Hexagonal Description: Family: Platanaceae Genus: Planaus Common Name: Sycamore Age: Lower Oligocene Location: Roxy Ann Mountain, Jackson County, Oregon Roxy fm. Description: Large thick slab with polished face. The wood is mostly black and dark grey in color with the exception of a large orange band in the center showing an iron deposit. Various cracks from the center outward are filled with silicate material. Cracks indicate earthquakes and faulting. Size: 19.00"x 10.00"x 1.00" 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 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 Collection

Acquisition

Accession

78.58

Source or Donor

Delmar Smith Petrified Wood Collection

Acquisition Method

Donation

Other Names and Numbers

Other Number

Other Number: 78.58.56

Dimensions

Width

1 in

Depth

1 in

Length

19 in

Dimension Notes

Dimensions taken at widest points

Location

Location

Container

Right

Drawer

Bottom / Back Row

Shelf

Right

Cabinet

Case #107

Wall

North Wall

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent