I'm taking a slightly different slant on the Thursday Challenge today; this is a bit of natural science here - a somewhat old ammonite found some years ago high up in the Cotswolds. The hills here are quite famous for the fossils they hold (not as famous as Dorset's Jurassic Coast, though!) and it is possible (as evidenced above) to grab a good example. I was lucky on this occasion as the farmer had just tilled his field and had dislodged this chap; I was able to pilfer him as the tractor chugged off into the distance.

Size? Well, this is a macro shot, so the size is a tad distorted (if that makes sense?)...approx one and a half inches across the bows.

11th June's Thursday Challenge entry; for other Pbasers being scientific or medicinal today click here

As always (sigh...) I can't decide between this shot or the one below: