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I posted this find in my trip report thread http://www.thefossilforum.com/index.php?/topic/95184-51319-oglesby-il-roadcut-pennsylvanian-shark-bits-brachiopods-and-more/ but I thought I would put it here too to get some more eyes on it. This piece is from the Pennsylvanian LaSalle Limestone member of the Bond Formation, collected on 5/13 and prepped some over the weekend. At first I thought it was the root of a shark tooth, but as I prepped and revealed the multiple "teeth" on top and the ratio of root to teeth it did not match up. That makes me think it is possibly a part of a jaw with teeth in it, but I have never found anything like that at this site before, nor have I seen any reported from this formation. Any ideas? The scale below is in CM.
deutscheben posted a topic in Fossil Hunting TripsA week ago today, I took the day off work to hit one of my favorite sites, a roadcut above the Illinois River in Oglesby, Illinois. This cut exposes the Pennsylvanian LaSalle Limestone member of the Bond Formation and produces abundant brachiopods as well as occasional other fauna including gastropods, cephalopods, coral, trilobites, and shark teeth. The weather was perfect, sunny but not too warm, when I pulled up. The cut is a somewhat unstable slope of cobbles and boulders of varying size, almost all with at least some fossils in them. To get up to the slope, you have to hop across a small ditch with running water. I have a good sampling of the common brachiopods from here, so I am looking for unusual fossils when I go now. I was very happy to quickly find a piece of trilobite as I started to search the rocks at the base of the hill. (I will put pics of everything I brought home in a response post) One interesting find that I was not able to bring home was this Linoproductus brachiopod with some shell preserved and a really pretty dendritic pattern on it- it was very delicate and firmly embedded in the middle of an ~80 lb boulder. I was able to stay for 4 hours, and I felt like I gave most of the site at least a quick look. I am very happy with what I found- I was able to check off many of the rarer things I was looking for, including shark teeth, a trilobite, cephalopod material, and a brachiopod with spines attached, as well as some nice crystallized brachiopods. I will post all of my finds below.