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Showing results for tags 'utah trilobite'.
I find myself unable to attach a species/genus name to the pair of trilobite pygidia I found in the Ibex area of Utah. The closest I can get is Ectenaspis judging from the form. The plate of two pygidia were found in the float of the Wah-Wah and Fillmore formations. They are weathered with some shell material, but not enough to see terracing or effacement. Found near the top of the ridge, they have to be Ordovican, but I can't be positive which formation it was situated. This genus is well know from the Maquoketa of Iowa and Decorah of Wisconsin, but I find no examples from elsewhere. A littl
I'm going through a bunch of trilobite fossils I collected at U-Dig Fossils in Utah about 10 years ago to get practice removing matrix. I started with this one because it's only a partial and would be no great loss if I messed up. I'm pretty sure it's an Elrathia kingii but what I don't understand is the protrusion that runs almost the full length of the axial lobe on the left side. It looks like it may have penetrated the animal in life. But it could have been part of the axial lobe that was displaced after death? There also looks to be a similar fragment along the right side of the axia