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List Of Fossiliferous Stratigraphic Units In Alaska
This article contains a list of fossil-bearing stratigraphic units in the state of Alaska, U.S. Sites See also * Paleontology in Alaska References * {{DEFAULTSORT:Fossiliferous stratigraphic units in Alaska Stratigraphic Units Alaska Stratigraphic Units 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 petrography, petrographic, lithology, lithologic or paleontology, ... Stratigraphy of Alaska United States geology-related lists ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratigraphic Units
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 petrography, 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 on 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 lithostrati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buchia Ridge Formation
The Buchia Ridge Formation is a geologic formation in Alaska. It preserves fossils dating back to the Cretaceous period. See also * List of fossiliferous stratigraphic units in Alaska * Paleontology in Alaska Paleontology in Alaska refers to paleontological research occurring within or conducted by people from the U.S. state of Alaska. During the Late Precambrian, Alaska was covered by a shallow sea that was home to stromatolite-forming bacteria. Alask ... References * Cretaceous Alaska {{Cretaceous-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colville Group
The Colville Group is a geologic group in Alaska. It preserves fossils dating back to the Paleogene period. See also * List of fossiliferous stratigraphic units in Alaska * Paleontology in Alaska Paleontology in Alaska refers to paleontological research occurring within or conducted by people from the U.S. state of Alaska. During the Late Precambrian, Alaska was covered by a shallow sea that was home to stromatolite-forming bacteria. Alask ... References * Geologic groups of Alaska Paleogene stratigraphic units of North America Paleogene Alaska {{Paleogene-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chitistone Formation
The Chitistone Formation is a geologic formation in Alaska. It preserves fossils dating back to the Triassic period. See also * List of fossiliferous stratigraphic units in Alaska * Paleontology in Alaska Paleontology in Alaska refers to paleontological research occurring within or conducted by people from the U.S. state of Alaska. During the Late Precambrian, Alaska was covered by a shallow sea that was home to stromatolite-forming bacteria. Alask ... References * Triassic Alaska {{Triassic-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chisana Formation
The Chisana Formation is a geologic formation in Alaska. It preserves fossils dating back to the Cretaceous period. See also * List of fossiliferous stratigraphic units in Alaska * Paleontology in Alaska Paleontology in Alaska refers to paleontological research occurring within or conducted by people from the U.S. state of Alaska. During the Late Precambrian, Alaska was covered by a shallow sea that was home to stromatolite-forming bacteria. Alask ... References * Cretaceous Alaska {{Cretaceous-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chinitna Formation
The Chinitna Formation is a geologic formation in Alaska. It preserves fossils dating back to the Jurassic period. See also * List of fossiliferous stratigraphic units in Alaska * Paleontology in Alaska Paleontology in Alaska refers to paleontological research occurring within or conducted by people from the U.S. state of Alaska. During the Late Precambrian, Alaska was covered by a shallow sea that was home to stromatolite-forming bacteria. Alask ... References * Jurassic Alaska Jurassic System of North America Bathonian Stage {{Jurassic-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chignik Formation
The Chignik Formation is a geologic formation in Alaska. It preserves fossils dating back to the late Cretaceous period. It unconformably overlies the Aptian-aged Pedmar Formation and is overlain unconformably by the late Paleocene-aged Tolstoi Formation. The Chignik formation contains large amounts of coal, which was noted by Wallace Atwood when he formally described the formation in 1911. The depositional environment of the Chignik appears to have been a cyclical sequence of terrestrial tidal flats and offshore marine deposits, with alternating beds of shale and sandstone, with coarse conglomerates present as well. Some of the sandstone layers are oil-stained. Fossil Content The fossil and rock records of the Chignik preserve both marine and terrestrial environments. The mollusk fossil record of the Chignik Formation indicates its age as a late Campanian to early Maastrichtian deposit. At least two bivalve species of the genus ''Inoceramus'' (''I. schmidti'' and ''I. baltic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chickaloon Formation
The Chickaloon Formation is a Formation (geology), geologic formation in Alaska. It preserves fossils dating back to the Paleogene Period (geology), period. See also * List of fossiliferous stratigraphic units in Alaska * Paleontology in Alaska Paleogene Alaska Thanetian Stage {{Paleogene-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cheeneetnuk Formation
The Cheeneetnuk Formation is a geologic formation in Alaska. It preserves fossils dating back to the Devonian period. See also * List of fossiliferous stratigraphic units in Alaska * Paleontology in Alaska Paleontology in Alaska refers to paleontological research occurring within or conducted by people from the U.S. state of Alaska. During the Late Precambrian, Alaska was covered by a shallow sea that was home to stromatolite-forming bacteria. Alask ... References * Devonian Alaska Devonian northern paleotropical deposits {{Devonian-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triassic
The Triassic ( ; sometimes symbolized š) is a geologic period and system which spans 50.5 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.4 Mya. The Triassic is the first and shortest period of the Mesozoic Era and the seventh period of the Phanerozoic Eon. Both the start and end of the period are marked by major extinction events. The Triassic Period is subdivided into three epochs: Early Triassic, Middle Triassic and Late Triassic. The Triassic began in the wake of the PermianāTriassic extinction event, which left the Earth's biosphere impoverished; it was well into the middle of the Triassic before life recovered its former diversity. Three categories of organisms can be distinguished in the Triassic record: survivors from the extinction event, new groups that flourished briefly, and other new groups that went on to dominate the Mesozoic Era. Reptiles, especially archosaurs, were the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chapin Peak Formation
The Chapin Peak Formation is a geologic formation in Alaska. It preserves fossils dating back to the Triassic period. See also * List of fossiliferous stratigraphic units in Alaska * Paleontology in Alaska Paleontology in Alaska refers to paleontological research occurring within or conducted by people from the U.S. state of Alaska. During the Late Precambrian, Alaska was covered by a shallow sea that was home to stromatolite-forming bacteria. Alask ... References * Triassic Alaska {{Triassic-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cascaden Ridge Formation
The Cascaden Ridge Formation is a geologic formation in Alaska. It preserves fossils dating back to the Devonian period. See also * List of fossiliferous stratigraphic units in Alaska * Paleontology in Alaska Paleontology in Alaska refers to paleontological research occurring within or conducted by people from the U.S. state of Alaska. During the Late Precambrian, Alaska was covered by a shallow sea that was home to stromatolite-forming bacteria. Alask ... References * Devonian Alaska Devonian southern paleotropical deposits {{Devonian-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
