| Ammonite (Meekoceras gracilitatus) | |
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This ceratid ammonite is one of the fossils whose lowest appearance in the stratigraphic record is used to define Olenekian stage of the lower Triassic (250 ma). Polygon counts: Original 241,899; 30,000 before compression Time: Lower Triassic Locality: Elko County, Nevada; Thaynes Limestone Formation Specimen: UCD Geology Teaching Collection P-3052 |
Last Updated: 05/24/2006 3:45 PM