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Hey everyone! Haven't posted here in a while, and thought I would come back with a trip report. Recently I became interested in Mazon Creek fossils - something unusual for me as a vertebrate person. I finally managed to get out in the field this spring and visit the Mazonia-Braidwood State Park and the Braceville spoil pile through an ESCONI trip. I have collected at quite a few Paleozoic sites before, but this was my first time hunting in the Carboniferous! I went to Mazonia with a friend on a weekend in early April, when there was no foliage and it was sunny outside. I read a lot of threads about Mazon Creek on this forum and we decided to go straight through the bushes to search for the most inaccessible areas we could find. Here are a few concretions. Sadly, both of these turned out to be empty Also found a first Pennsylvanian garter snake Here is our total haul for ~4 hours. The only non-Essexella thing we found already open was this coprolite (?). By the way - if you see any errors with identification in this thread please correct me, I'm still learning a lot about this awesome deposit. Then came the freeze-thaw. I decided to cheat a little and use the -80C freezer in the lab I work in, which shortens the freezing part of the cycle to a few hours. At this point, most of the concretions from this trip have already opened: My nicest and largest Essexella ascherae. Another Essexella (after vinegar). When it opened, I first thought it was some arthropod segment, but I like it anyways. This one is weird. Coprolite? Probably nothing (?), but the pyrite is pretty. A plant of some kind, probably not identifiable. And my favorite find: I believe this is the apex of a Calamites sp. - segments are clearly visible. This concretion didn't want to open for over a month, so I got frustrated and dropped it from the 4th floor of my building as I didn't have a hammer with me... Don't do that.
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