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| Keywords: fossils yellowstone national park yellowstonenationalpark trilobites YELL-165706 and YELL-165715 (pictured here): Many times when fossils are collected they are only casts of the specimen, such as the pictures above of a few nearly complete Ptychopariid trilobite (YELL-165706 and YELL-165715) casts. As an organism becomes buried in sediment, its body decays, leaves an open space in the shape of the animal and then gets filled in with sediment creating an external cast of the organism. If an open space or cavity remains after the animal is buried and become fossilized then it is referred to as a mold. Collecting any natural resources, including rocks and fossils, is illegal in Yellowstone. Megan Norr; March 2016; Catalog #20800d; Original #USNM_165715 YELL-165706 and YELL-165715 (pictured here): Many times when fossils are collected they are only casts of the specimen, such as the pictures above of a few nearly complete Ptychopariid trilobite (YELL-165706 and YELL-165715) casts. As an organism becomes buried in sediment, its body decays, leaves an open space in the shape of the animal and then gets filled in with sediment creating an external cast of the organism. If an open space or cavity remains after the animal is buried and become fossilized then it is referred to as a mold. Collecting any natural resources, including rocks and fossils, is illegal in Yellowstone. Megan Norr; March 2016; Catalog #20800d; Original #USNM_165715 | ||||
