That looks like my truck. Only I recently sold my truck because I couldn't use it. Too difficult for the wife and I to climb into. So now I use my van, or get my son to use his truck to get something I need.
Seemed too heavy to be aspen, and the few cuts I made were a lot tougher than I remember aspen being. Doesn't really matter which it is, I have mostly ash in the stacks and could use a lighter btu wood anyway.
I don't know birch that well, but I am thinking that is not Aspen. I am burning Aspen as I type this, um wait a minute ... ... bad photo, but it does burn fine. Great action from the secondaries. So, you win either way!
What kinda science experiment is that? Looks like a jellyfish fell in a blender.... Actually, that's a GREAT pic bushpilot Stayin warm= gooder
Well, that merits another, about 35 minutes later. Reminds me of a song, kind of a theme song for (ahem) "hoarders" in the day.