My Mom And Dad Were Doing Some Landscaping In The Backyard And Found This Weird Slate With Writing Etched Into It. The Months Are Spelled Out And The Year States 1827 But That’s All The Information Here. I Can Send More Pics In Pm. Also, This Was Located In Southern Missouri
Answer: a practice gravestone scrap. Someone who carved gravestones would practice engraving lettering and drawings on this broken piece of stone.
that's just CUM ! 
and to think all sorts of things such as this in our "drinking water"