Looks like I have a rock ledge 16 to 36 incheds down what is the procedure here for piers?
You could just go with standard design footings or engineered footings, or if you want to make use of the bedrock, you could drill it with a rotohammer and epoxie rebar into it then pour your concrete piers. I don't really think the latter is necessary in the case of a small cabin but it is possible if that is your desire.
At any rate it looks like you have a stable foundation. Are you in a seismic zone?