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Showing results for tags 'phyllite'.
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Longtime lurker here. As my first post, this will be a trip report about mine and @UtahFossilHunter 's attempt to find the rumored fossils on Stansbury Island in the middle of the Great Salt Lake. The island isn't quite known for having fossils but the rocks are the right ages for this area. First, we consulted a geologic map of the area we wanted to look through. We used this map from a dissertation of a student at the University of Utah. We decided to go to the undifferentiated Mississippian this time. We had gone out to the area a few times. We had gotten skunked on the Ordovician Garden City Formation and undifferentiated Cambrian in early February. Although, it had a nice view so the hike wasn't for nothing. Both of those formations were empty of macrofossils. (Microfossil analysis coming soon!) So we went to an adjacent valley where a grassy hill sat where the undifferentiated Mississippian would outcrop. We saw a outcrop of phyllite but staying hopeful, we hiked to it looking for any fossils. At the outcrop, I flipped over a rock from one of the beds. Lo and behold, at last, some fossils, albeit slightly metamorphosed. This layer and only this layer is filled with bivalves and brachiopods. We grabbed some sizeable chunks and made are way out. Stay tuned for more progress on research here.
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- bivalves
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