Name/Title
Seed LeafEntry/Object ID
07.57.16Description
1.5" long, basswood-like, leaf seed imprint on a beige sandstone.
This imprint was left when a leaf pressed into soft sediment, and with the sediment surface deforming into the shape of the leaf. Fossilization happened after the leaves sank to the bottom of a pond or lake and were later buried by additional fine-grained sediments. Though the leaf completely rotted away, additional sediments and mineral filled the gap left behind, preserving the imprint. Eventually these fine-grained sediments became sandstone, shale or mudstone.
Imprints often include some level of carbonization as well, where the carbon-content of the original leaf is preserved along with the imprint, once other organic materials are removed via decay or pressure.
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malvales
Family: Malvaceae
Subfamily: Tilioideae
Genus: Craigia
Species: †C. oregonensis
Common name: Craigia (winged fruit)
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 grainCollection
Fossil CollectionAcquisition
Accession
07.57Source or Donor
Fossil CollectionAcquisition Method
DonationOther Names and Numbers
Other Number
Other Number: 2007.57.16Dimensions
Width
1-1/2 inDepth
1/2 inLength
1-1/2 inDimension Notes
Dimensions taken at widest pointsLocation
Location
Display Case
PW-8Room
Petrified Wood RoomBuilding
Crater Rock MuseumCategory
ExhibitMoved By
Jillian Mather KettleyDate
May 28, 2025Notes
Location update
