Up at Swatara State Park, near the eastern end, is the remnants of an old culm dump. One day, I stopped at the one clearing while on a motorcycle ride for a quick break. I just about set my kickstand on a piece of culm, when I noticed there were the imprints of plants on the surface. I took a few handfuls of these home, and picked them apart, finding a number of very well preserved fossilized plant leaves and flowers.
I was back up there recently, to grab a few more pieces to pick through for fossils. Once I picked through the culm, I threw all the remnants without fossils into the 'ole DS machine. It was probably about enough coal/culm to fill a large coffee can.
I was suprised to see this stuff does indeed burn, it appears to burn down to almost an orange-ish color ash, with sections of white mixed in.
Has anyone ever tried burning a stove full of culm? I was thinking of getting a couple 5 gallon buckets of culm to pick through for fossils, then burning all of the non-fossil containing pieces in the stove, but I didn't know if culm would have enough BTU's to sustain a fire in a hand-fired, natural draft stove.