this post was submitted on 04 Feb 2025
72 points (93.9% liked)
What is this thing?
6130 readers
52 users here now
Let us help you identify that mysterious object you’ve found.
Currently in CHALLENGE mode: If you've got something obscure knocking about, post a picture, and let's see how we do. Please prefix such posts with "CHALLENGE:" so we know we've got a fighting chance.
founded 2 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Not glass, but hardened resin. Used to track littoral currents and drift. Has metal so it can be found later with a metal detector.
A tracer pebble, interesting. But they seem to be rather made of the same pebble they are supposed to trace. https://southerncoastalgroup-scopac.org.uk/tracer-pebble-studies/
Fascinating!