Baculites
Fossil
About it
Straight Late Cretaceous ammonite, oval in section, whose frilly sutures prove it isn't a nautiloid. Abundant in the Pierre Shale of South Dakota, Montana, and Wyoming; pieces with pearly shell are prized.
- Type
- Fossil (mollusc)
- Group
- Cephalopod (mollusc)
- Colours
- brown, grey, tan, iridescent
- Transparency
- opaque
- Periods
- Cretaceous
Typical values: real specimens vary. For more, see mindat.org.