After leaving the Bark in the Park area, I walked across the parklands and through the olive grove towards home.
On a bare patch of ground I saw something that surprised me.
In one of them eroded earth was exposing shells usually found on a beach.
Here's a closer look->
Perhaps left behind by long ago picnickers?
Scooped up with earth and used as landfill for the area?
It's right on the southern edge of the olive groves.
33 minutes ago