Atrypa
Fossil
Also called Atrypa reticularis
About it
Rounded brachiopod with fine radiating ribs crossed by growth lines, one valve nearly flat and the other swollen. Very common in Silurian and Devonian rocks of North America and Europe, including the Great Lakes region.
- Type
- Fossil (brachiopod)
- Group
- Brachiopod
- Colours
- grey, brown, tan, cream
- Transparency
- opaque
- Periods
- Silurian, Devonian
Typical values: real specimens vary. For more, see mindat.org.