I came home today to find a small rectangular area of soil (about 14" x 6") covered in something yellow. It's in the landscaping in front of our front porch and next to the driveway. I scooped it up the best I could and ran some errands this evening. When I came home there was a small section of yellow that reappeared. I did plant a new shrub to the left of it about 2 weeks ago. There's probably a foot between the shrub and the yellow seciton.
Any ideas what it could be?