Pinnixa galliheri crabs

A few fragmented pieces of Pinnixa galliheri crab fossils, which are found in the Monterey formation of California, USA.


Pinnixa galliheri fossil crabs

These are Pinnixa galliheri fossil crab fragments from the Monterey formation of San Luis Obispo County, California, USA. They are also known as the 'pea crab'. The Monterey shale preserves them in excellent detail, where they are found in amongst the remains of fish, pine cones, and other crabs - a shallow coastal environment with a deciduous forest either by the shore or partially in the sea.

These crabs are approximately 8 million years old (Miocene), but the genus survives today. Please note, these pieces are extremely fragile and are preserved in a very lightweight shale. Due to their fragility, these pieces will be dispatched with extra padding and will only fit in a small parcel box, not a large letter box.

The specimens we currently have in stock are extremely fragmentary and typically consist of only a few legs, and perhaps a partial body. There may be evidence of further fossils in the blocks but there's nothing that especially stands out to my eyes. It's a real shame they are so fragmented, but, well - where else can you get a crab fossil for under £3?


Our current stock includes:

  • #1 - 57.5x33.4x9MM - very fragmentary, several legs on the side of a shale chunk.
  • #2 - 31.6x31.4x9.8MM - very fragmentary, several legs on the side of a shale chunk.
  • #3 - 41x21.3x6.9MM - very fragmentary, several legs on the side of a shale chunk.
  • #4 - 40x13.4x11.5MM - several legs and a partial body.
  • #5 - 34x13.8x11.4MM - the most complete specimen I have; roughly one half of the full fossil, perhaps a little more.

Frequently asked questions and delivery information

How do we grade stones?

There is no overall universal grading system for the majority of our products. As such, the grades we use are internal only. They simply refer to higher and lower qualities, but they may be entirely different grades to other websites. C grade pieces are of lower quality than B grade, which is lower than A grade.


How does our ordering and delivery process work?

You place an order via the website. When it’s been picked and packed, your order will be marked as completed and dropped off at our local post office. We have an account with the post office called a “Drop and Go” account, which allows the post office staff to process our parcels when they have free time, rather than me queuing up and delaying everyone else.

I get tracking information etc online when this has been completed. I typically do not send tracking information to customers unless they request it – but if you’ve requested tracked postage, it has been sent tracked! If you have any worries or concerns about your parcel being delayed please feel free to get in touch and I’ll send the tracking info over! We also get delivery confirmations for parcels over 25MM thick by default.


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