Check the listing for details. Cut and Polished Coprolite • Henry Mountains •. Condition: New, Made in United States. Listed at 25.00 USD. Location: Found in the Morrison Formation near the Henry Mountains in Wayne County, Utah. Age: These specimens date back to the Jurassic Period, approximately 146 to 156 million years ago. Composition: Frequently agatized, meaning they have replaced with silica, allowing for excellent preservation and polishing potential. Origin: Often attributed to Sauropods and other dinosaurs that roamed the area. Appearance: These fossils are found in various shapes, with some, like a 1.92 kg specimen, holding records for being "true-to-form". They are often polished to reveal intricate internal structures, which are valuable to researchers and collectors alike. Scientific Value: They offer a glimpse into the diet of prehistoric animals.