Brown dig patches?

"DizzyDi34;d-931471" wrote:
It seems all the mineral and frog spawners have been replaced in foundry cove with brown dig patches,when and why did this happen?

I noticed this weekend (I played sooooo many hours) that more often than not brown dig spots would generate. They also don't go away when I dig them up, which is weird because they would prior. Then next day they would spawn again, or it would alternate b/t rocks and logs.