Limestone Rocks!

Spotted this bumper sticker while I was stuck in traffic, and it got a genuine LOL out of me.
At first, I thought this was just someone who was a geologist. But after a bit of digging around (see what I did there), I’m now wondering if it was part of some effort to preserve the limestone revetments at Promontory Point.
Perhaps this bumper sticker was part of the protests that emerged, circa 2001, when there were plans to replace the limestone revetments. I’ve seen many older “Save the Point” references and stickers, but wonder if the “Limestone Rocks!” was part of that era.
Either way I guess – Limestone Rocks! rocks.
Related:
Found Rocks
Starved Rock
I Got a Rock
Starting Off a Lazy Sunday with a Trek to Promontory Point
Jung Family Vacation in Arizona, Day 1: Arrival and the Shadow of Castle Rock
Early Morning Adventure: Watching the Big Waves at Lake Michigan
Exploring Half Moon Bay and the Fitzgerald Marine Reserve

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