Name/Title
TrigoniaEntry/Object ID
2011.57.133Description
Crystal System: Hexagonal System
Description: Phylum: Mollusca
Family: Trigoniidae
Class: Bivallvia
Order: Trigonida
Common Name: Trigonia
Age: Eocene
Location: Hornbrook Formation, Siskiyou Mountains, Oregon / California border
Description: Very large salb with multiple fossils in very good detail, in one area. (cluster). Color is dark gray to brown sandstone.
Physical Characteristics:
Bivalvia (common name bivalves) is a taxonomic class of marine and freshwater molluscs. This class includes clams, oysters, mussels, scallops, and many other families of molluscs that have two hinged shells. The class was known for some time as Pelecypoda, which is a reference to the soft parts of the animal, whereas the name Bivalvia simply describes the shell, which has two valves. Other names which have been used for this class include Lamellibranchia (referring to the plate-like gill elements, see ctenidium), Acephala (they have no head), and Bivalva (two valves).
Family: Trigoniidae
Fracture: Conchoidal
Grain Size: Fine
Hardness: 3 Calcite
Kingdom: Animalia (Animals)
Luster: Vitreous
Class: Bivalvia
Order: Trigonida
Phylum: Mollusca
Rock Origin: Terrestrial
Rock Type: Sedimentary
Streak: whiteCollection
Museum Collection of FossilsAcquisition
Accession
2011.57Source or Donor
Museum Collection of FossilsAcquisition Method
Long-term LoanDimensions
Width
16-1/4 inDepth
2 inLength
22-3/4 inLocation
Location
Drawer
LeftShelf
Front, FrontWall
NorthRoom
Delmar Smith HallBuilding
Crater Rock MuseumCategory
PermanentMoved By
Steve MillerDate
August 9, 2011Location
Room
Fossil RoomBuilding
Crater Rock MuseumCategory
Permanent
