Where in NZ In fine grained marine rocks all over New Zealand.
When Late Cambrian (500 million years ago) to present
Scale 20-200 μm (0.02 to 0.2 mm)

Fossil radiolarian, 60 million years old.

What are they?

  • Single-celled planktonic marine organisms that construct skeletons of opaline silica
  • Are at the base of the marine food chain

Used for:

  • Investigating changes in the ocean environment

See some examples in our image gallery.