- Home
- Rocks
- Type fossils
- Fossil Specimens
- Minerals
- Glossary
- Stratigraphic Chart
- Michel-Levy Chart
- Classification of igneous rocks
- University of Cambridge
- Department of Earth Sciences
- ESC Library
- Moodle
- Sedgwick Museum
- DoITPoMS
- Mindat.org
- Microfossils
- Bryozoans
- Webmineral
- Tree of Life
- CrystalMaker
- Virtual Microscope
TF0103 Trigonia
Title
TF0103
Trigonia
Subject
Age
Jurassic
Description
Stratigraphic Range
Jurassic to recent
Taxonomy
Phylum: Mollusca
Class: Bivalvia
Order: Trigoniida
Family: Trigoniidae
Class: Bivalvia
Order: Trigoniida
Family: Trigoniidae
Distinctive Features
Ribs
Dentition, hinge
Growth lines
Dentition, hinge
Growth lines
Preservation
Set 1:
Mineral replacement of shell (aragonite to calcite)
Set 2:
Disarticulation of valves
Sediment infil (oolitic ironstone, which gives the reddy colour to the specimen)
Mineral replacement of shell (aragonite to calcite)
Mineral replacement of shell (aragonite to calcite)
Set 2:
Disarticulation of valves
Sediment infil (oolitic ironstone, which gives the reddy colour to the specimen)
Mineral replacement of shell (aragonite to calcite)
Advanced notes
Strong ribs are present on the anterior part of the shell - perhaps to discourage predators or as a response to a high energy environment?
Citation
“TF0103
Trigonia,” 1A Collections, accessed April 9, 2024, https://wserv3.esc.cam.ac.uk/p1acollections/items/show/88.
Trigonia,” 1A Collections, accessed April 9, 2024, https://wserv3.esc.cam.ac.uk/p1acollections/items/show/88.