I believe its a box turtle. It comes in many different shapes and sizes, from your description it should be some kind of box turtle. It also depends on where you live.
It's more than likely some sort of box turtle. It all depends on where your geographic location is. Google your state followed by box turtle to investigate further.
This could be a leopard tortoise or possibly a box turtle. If you found it next to a tree it's probably a box turtle and if you found is in a meadow it's a Leopard tortoise.
