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This trilobite pygidium was found in a talus slope at base of Fossil Mountain in Western Utah. As you can see it is quite weathered. I found it about 25 years ago when my mom and I went back country driving in my Ford Tempo lol. That car went into a number of not car friendly areas haha. From what I know of area geology I believe it would be Ordovician in age

Hi Everyone I found this Trilo in the scree on the shoulders of Fossil Mountain in Utah about 7 years ago. I have looked for its source higher up on the mountain the last few times I went there and could never find another. Can anyone ID it? It is the biggest and most intact specimen I have ever found at that site and would be curious to know what it is. Thanks for your help.

Well I finally had the opportunity to head out to Millard Co. with my Geology professor, the esteemed Forest Gahn. He is one of the worlds leading experts in Echinoderms and he specializes in Crinoids. The guy goes diving a lot to study Echinoderms in their natural habitat and he's managed to keep some Crinoids thriving in a tank at BYU in Rexburg, Idaho. Here's some pictures of the trip to some special Geology and Paleontology sights in south western Utah. I had a blast. Students sitting on the edge of Fossil Mountain, one of the richest Ordovician deposits in the world learning about it's geology from Forest Gahn. The major fossiliferous formations are the Juab and Kanosh Shale formations. In a remnant of the last ice age lake, Lake Bonneville forest scopes up a handful of algae and cyanobacteria rich mud along with Playa (dried up lake). This is an extinct marine animal known as a Graptolite discovered at a nearby Ordovician road cut in Millard Co. UT. No trip is complete without trilobites. Here's a large Asaphiscus wheeleri molt from U-Dig near Delta, UT. This Native American arrowhead was recovered in Millard CO Utah during one of our hikes. My professor claims its origins may be from the Shoshone Tribe. Forest teaches students about the Cambrian marine fauna at U-Dig near Delta, UT. Forest shows students the fossilized remains of a Stromatolite (just above his knee) colony alongside the Lake Bonneville Playa (dried lake) near Notch Peak UT. Here is the view of Fossil Mountain in Millard CO, UT at sunrise. At dusk on the first night we camped at the dunes of Little Sahara which are composed of ancient sand deposits from the Sevier River dumping into Lake Bonneville. Perhaps one of my favorite parts of the trip was being let into the collections archive room at the BYU museum of paleontology in Provo, UT. A lot of the dinosaurs in the collections here are from the Saints and Sinners Quarry in Colorado. Lots of neat therapods including a near complete Allosaurus.

As I announced a while back I am planning a trip out to Utah for late August/ early September. I plan on spending two days in the Delta area prospecting for trilobites and other fossils in the paleozoic rocks of the region. I keep seeing references to Fossil Mountain and that it has Ordovician fossils but is it worth the trip? Will I be finding slabs with fossils or loose fossils or a combination of the two? Considering that I have to mail all my finds back home to Philadelphia I don't want to ship large quantities of fossil hash that will just wind up in my garden. Anyone have some material they have collected that they can post a picture of? Thank you in advance. -Dave