Name/Title
Trigonia (Bivalve)Entry/Object ID
78.57.101Description
One concretion mass showing both internal shell impressions and external shells.
Phylum: Mollusca
Class: Bivalvia
Order: Trigoniida
Family: Trigoniidae
Subfamily: Trigoniinae
Genus: †Trigonia
Age: Late Cretaceous
Location: Hornbrook Formation, Siskiyou Mountains
Mineral Data (Calcite?)
Fracture: Conchoidal
Crystal System: Hexagonal System
Grain Size: Fine
Hardness: 3 Calcite
Kingdom: Animalia (Animals)
Luster: Vitreous
Class: Bivalvia
Phylum: Mollusca
Rock Origin: Terrestrial
Rock Type: Sedimentary
Streak: whiteCollection
Fossil CollectionAcquisition
Accession
78.57Source or Donor
Delmar Smith Fossil CollectionAcquisition Method
DonationDimensions
Width
11-3/4 inLength
8 inDimension Notes
11.75" (30 cm) x 8" (20 cm)Location
Location
Shelf
CS-H-6Room
Curation StorageBuilding
Crater Rock MuseumDate
February 3, 2024Location
Container
LeftDrawer
Bottom ShelfShelf
LeftCabinet
Case # 2Wall
WestRoom
Fossil RoomBuilding
Crater Rock MuseumCategory
PermanentDate
April 22, 2021Notes
Currently in the first room of the Fossil Hall, in a low display on the wall across from the entry from Freida Hall.
