That is definantely mud from peoples shoes. Cool story though. Good job playing your first night game in history in 2017 even though lights bulbs were invented in 1878
You’re right it’s not goose poop lol.
https://saturdaytradition.com/india...n-the-bleachers-at-indianas-memorial-stadium/
Just own it that geese crapped all over your stadium that day.