It's a Mystery to Me

I walked down to the Farmer's Market this morning, and as I walked by the park entrance I spotted these markers.

I must have walked past them most days for the last 30 years and never noticed them!

They are just before the bridge, so I guess they mark, telephone cables, water, gas, etc.

Bought some garlic to plant and, for a treat, some Chocolate Brownies from The Yummy Yank stall. They'll disappear this afternoon, methinks.