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Fossil Hill Member
The Fossil Hill Member is a Middle Triassic-aged rock unit. The Fossil Hill unit occurs as a member of both the Prida Formation, Prida and Favret Formation, Favret formations. It outcrops in multiple locations across Northwestern Nevada including the western Humboldt Range, Tobin Range, Augusta Mountains, and China Mountain. Calcareous shale, mudstone, and black limestones are the most common Lithology, lithologies present within the unit. The member was named for Fossil Hill, Nevada, a locality within the Humboldt Range, Humboldt Mountains where large quantities of Anisian-aged marine Fossil, fossils were discovered in the early 20th century. Fossils are common throughout the Fossil Hill, and the unit is well known for preserving the remains of some of the earliest marine reptiles, including several genus, genera of ichthyosaurs and a Pistosauroidea, pistosaur. Other fossils include bony fish, Hybodontiformes, hybodont sharks, and Invertebrate, invertebrates with Ceratitida, cera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geological Member
A stratigraphic unit is a volume of Rock (geology), rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrology, petrographic, lithology, lithologic or paleontology, paleontologic features (facies) that characterize it. Units must be ''mappable'' and ''distinct'' from one another, but the contact need not be particularly distinct. For instance, a unit may be defined by terms such as "when the sandstone component exceeds 75%". Lithostratigraphic units Sequences of sedimentary rock, sedimentary and volcanic rocks are subdivided the basis of their shared or associated lithology. Formally identified lithostratigraphic units are structured in a hierarchy of lithostratigraphic rank, higher rank units generally comprising two or more units of lower rank. Going from smaller to larger in rank, the main lithostratigraphic ranks are Bed, Member, Formation, Group and Supergroup. Formal names of lithostratigraph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
