So I found this rock in the Thames in like 2001/2002. Any idea what it is? It looks like flint on the inside but with something else on the outside?
Must be camouflage on the outside. I can't see it.
I kept getting a fail message when uploading.
https://imgur.com/a/ta8TX5A
@mespilus started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
So I found this rock in the Thames in like 2001/2002. Any idea what it is? It looks like flint on the inside but with something else on the outside?