Searching for treasure and coming up nettle

In Chisago and Washington Counties, 100% of the water we drink comes from groundwater. Though few people think about it when they turn on the sink, the origins of this water are intricately woven into the history of the rocks and the land. Sand from ancient seas that covered Minnesota 500 million years ago eventually compressed into layers of sandstone that are buried beneath our feet. When it rains, the water soaks into the ground, filling pore space between the grains of sand to create formations known as aquifers. There are also layers of limestone that formed when plant and animal remains were buried and compressed over time. The limestone creates confining layers that separate shallow sandstone aquifers from ones that are deeper down.

https://eastmetrowater.org/2023/09/05/searching-for-treasure-and-coming-up-nettle/