Odd evidence of bugs?

Emmy

Hi,
I'm new to these boards, so thanks in advance for any guidance you can give me. I just bought a plum bonsai (not sure if it's natal plum or chinese plum).

The plant is healthy looking, and the soil is covered by soil and gravel/rocks. However, when I came home from work today, I noticed that somehow, there was a small pile of soil was on top of the gravel, and looked as if it were finely ground - almost like coffee grounds.

There's a pretty good layer of gravel before you hit the soil, and because of the texture of the pile of soil, I feel like some kind of bug must have caused it while burrowing up from the soil or something. I wish I had taken a picture.

Any advice you can offer me is greatly appreciated! I love my little tree and don't want anything bad to happen to it!

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