Alnus hollandiana (Toothed Alder Leaf)

Object/Artifact

-

Crater Rock Museum

Name/Title

Alnus hollandiana (Toothed Alder Leaf)

Entry/Object ID

07.57.09

Description

Toothed Alder leaf imprint on a beige sandstone. Leaf fossils in this case are carbon films that remain on the bedding surfaces of fine-grained sediments. Fossilization happened after the leaves sank to the bottom of a pond or lake and were later buried by additional fine-grained sediments. With burial, the leaves were compressed and the sediment surrounding them solidified. Eventually these fine-grained sediments became sandstone, shale or mudstone. When all the volatile organic material in the living leaf was pressed out, only a thin carbon residue was left in the sediment, marking the outline and veins of the leaf. Clade: Tracheophytes Clade: Angiosperms Clade: Eudicots Clade: Rosids Order: Fagales Family: Betulaceae Subfamily: Betuloideae Genus: Alnus Species: †A. hollandiana Common name: Toothed Alder Rock and Mineral Data (Silica): Assemblage Zone: sandstone Chemical Composition: Si O2 Crystal System: Subhedral Type of Fossils Present: Plants Fracture: conchoidal Grain Size: Fine Hardness: 7 Quartz Lithofacies: sedimentary Luster: Silky Occurrence: Pressure: Moderate Rock Color: Dark Rock Origin: Marine/Freshwater Rock Type: Sedimentary Specific Gravity: 2.6 Surface Process: Not apparent Temperature: Low Texture: fine grain

Collection

Fossil Collection

Acquisition

Accession

07.57

Source or Donor

Fossil Collection

Acquisition Method

Donation

Other Names and Numbers

Other Number

Other Number: 2007.57.09

Dimensions

Width

3 in

Depth

3/8 in

Length

2 in

Dimension Notes

Dimensions taken at widest points

Location

Location

Container

Right

Drawer

2nd Shelf

Shelf

Left

Cabinet

Case #105

Wall

North Wall

Building

Mentzer Hall - Petrified Wood Room

Category

Permanent