sgwarnog's picture


Observed: 5th April 2011 By: sgwarnogsgwarnog’s reputation in Plantssgwarnog’s reputation in Plantssgwarnog’s reputation in Plants

Not sure if iSpot does fossils, but here goes. It's been suggested that this might fossil club moss, Sigillaria perhaps. The stone is probably Ganister, which was mined in the locality. Stone now being used as a coping stone on a dry wall.

    Likely ID
    Clubmoss (Sigillaria)
    Confidence: It might be this.
  • clubmoss root (stigmaria)
    Confidence: I'm as sure as I can be.
Species interactions

No interactions present.


Fenwickfield's picture

More like

I would say it is neolithic cup and ring markings (man made) as they are to regular,I have found stones which will have cup shapes carved out plus spiral shapes,or some one may have done it more recently,any more pics close up


sgwarnog's picture

There are many cup-marked

There are many cup-marked rocks on the moor, but this is unlike any of them, although I have already sent the image to our local rock art expert for an opinion. The evenly spaced holes are what characterise clubmoss fossils.

Peter H

anonymous spotter's picture

I can't add -

to the serious debate, but doesn't it look like a pair of amphibians petrified in mid-amplexus?

Peter Skelton's picture


'Stigmaria' is the old name given to these fossil roots (and is still used as a field term for them), before it was realised that they belonged to the clubmoss (lycophyte)tree, Lepidodendron. Different bits of fossil plants were often assigned different names in this way. The regular pits seen here represent the bases of projecting rootlets, which were probably analogous to the aerial pneumatophores of living mangroves, adapting the plants to living in stagnant swampy environments. They are quite common, preserved in situ, in Carboniferous ganisters (as shown here), which are fossil seat-earths - usually overlain in turn by coal (fossil compressed peat). At that time, England was in the tropics, with extensive coal-swamps forming on the tops of vast deltas that were then spreading southwards from the Caledonian mountains.

Nice example!