|
List Of Fossiliferous Stratigraphic Units In Minnesota
This article contains a list of fossil-bearing stratigraphic units in the state of Minnesota, Minnesota, U.S. Sites See also * Paleontology in Minnesota References * {{DEFAULTSORT:Fossiliferous stratigraphic units in Minnesota Fossiliferous stratigraphic units of the United States, Minnesota Paleontology in Minnesota, Stratigraphic units Stratigraphy of Minnesota Minnesota geography-related lists 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 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] |
Ion Formation
The Ion Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period. See also * List of fossiliferous stratigraphic units in Illinois This article contains a list of fossil-bearing stratigraphic units in the state of Illinois, U.S. Sites See also * Paleontology in Illinois References * {{DEFAULTSORT:Fossiliferous stratigraphic units in Illinois Illinois Stratigraphi ... References * Ordovician Iowa Ordovician Illinois Ordovician Minnesota Ordovician geology of Wisconsin Ordovician southern paleotropical deposits {{Illinois-geologic-formation-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossiliferous Stratigraphic Units Of The United States
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Paleontology is the study of fossils: their age, method of formation, and evolutionary significance. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years old to 4.1 billion years old. Early edition, published online before print. The observation in the 19th century that certain fossils were associated with certain rock strata led to the recognition of a geological timescale and the relative ages of different fossils. The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the absolute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleontology In Minnesota
Paleontology in Minnesota refers to paleontological research occurring within or conducted by people from the U.S. state of Minnesota. The geologic record of Minnesota spans from Precambrian to recent with the exceptions of major gaps including the Silurian period, the interval from the Middle to Upper Devonian to the Cretaceous, and the Cenozoic. During the Precambrian, Minnesota was covered by an ocean where local bacteria ended up forming banded iron formations and stromatolites. During the early part of the Paleozoic era southern Minnesota was covered by a shallow tropical sea that would come to be home to creatures like brachiopods, bryozoans, massive cephalopods, corals, crinoids, graptolites, and trilobites. The sea withdrew from the state during the Silurian, but returned during the Devonian. However, the rest of the Paleozoic is missing from the local rock record. The Triassic is also missing from the local rock record and Jurassic deposits, while present, lack fossils. Ano ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Windrow Formation
The Windrow Formation is a geologic formation in Minnesota named after Windrow Bluff on Fort McCoy, Monroe County, Wisconsin. It preserves fossils dating back to the Cretaceous period Period may refer to: Common uses * Era, a length or span of time * Full stop (or period), a punctuation mark Arts, entertainment, and media * Period (music), a concept in musical composition * Periodic sentence (or rhetorical period), a concept .... See also * List of fossiliferous stratigraphic units in Minnesota * Paleontology in Minnesota References * Cretaceous Minnesota {{Cretaceous-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stewartville Formation
The Stewartville Formation is a geologic formation in Iowa. It preserves fossils dating back to the Ordovician period. See also * List of fossiliferous stratigraphic units in Iowa This article contains a list of fossil-bearing stratigraphic units in the state of Iowa, U.S. Sites See also * Paleontology in Iowa References * {{DEFAULTSORT:Fossiliferous stratigraphic units in Iowa Iowa Stratigraphic units A stra ... * Paleontology in Iowa References * Ordovician Minnesota Ordovician Iowa Ordovician southern paleotropical deposits {{Ordovician-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devonian
The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, where rocks from this period were first studied. The first significant adaptive radiation of life on dry land occurred during the Devonian. Free-sporing vascular plants began to spread across dry land, forming extensive forests which covered the continents. By the middle of the Devonian, several groups of plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants appeared. The arthropod groups of myriapods, arachnids and hexapods also became well-established early in this period, after starting their expansion to land at least from the Ordovician period. Fish reached substantial diversity during this time, leading the Devonian to often be dubbed the Age of Fishes. The placoderms began dominating ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spillville Formation
The Spillville Formation is a geologic formation in Iowa. It preserves fossils dating back to the Devonian period. See also * List of fossiliferous stratigraphic units in Iowa This article contains a list of fossil-bearing stratigraphic units in the state of Iowa, U.S. Sites See also * Paleontology in Iowa References * {{DEFAULTSORT:Fossiliferous stratigraphic units in Iowa Iowa Stratigraphic units A stra ... * Paleontology in Iowa References * Devonian Minnesota Devonian Iowa Devonian southern paleotemperate deposits {{Devonian-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spechts Ferry Formation
The Spechts Ferry Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period. See also * List of fossiliferous stratigraphic units in Illinois This article contains a list of fossil-bearing stratigraphic units in the state of Illinois, U.S. Sites See also * Paleontology in Illinois References * {{DEFAULTSORT:Fossiliferous stratigraphic units in Illinois Illinois Stratigraphi ... References * Ordovician Minnesota Ordovician Iowa Ordovician Illinois Ordovician geology of Wisconsin Ordovician southern paleotropical deposits {{Illinois-geologic-formation-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shakopee Formation
The Knox Supergroup, also known as the Knox Group and the Knox Formation, is a widespread Group (geology), geologic group in the Southeastern United States. The age is from the Cambrian, Late Cambrian to the Ordovician, Early Ordovician. Predominantly, it is composed of Carbonate rock, carbonates, chiefly Dolomite (rock), dolomite, with some limestone. There are also cherty inclusions as well as thin beds of sandstone. Stratigraphy The Knox lies beneath a unconformity known as the Knox Unconformity. There is well-developed Karst, karst topography at the top of the Knox Supergroup. This demonstrates a prolonged period of erosion. This has modern economic impact because of forming reservoirs for hydrocarbons as well as some mineral deposits. Everton Formation The Everton Formation is a Formation (geology), geologic formation in northern Arkansas through Missouri, Illinois and Indiana that dates to the middle Ordovician Geological period, Period. It was named by Ulrich (1907) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prosser Limestone
The Prosser Limestone is a geologic formation in Illinois, USA. It preserves fossils dating back to the Ordovician period. See also * List of fossiliferous stratigraphic units in Illinois This article contains a list of fossil-bearing stratigraphic units in the state of Illinois, U.S. Sites See also * Paleontology in Illinois References * {{DEFAULTSORT:Fossiliferous stratigraphic units in Illinois Illinois Stratigraphi ... References * Ordovician Minnesota Ordovician Iowa Ordovician Illinois Ordovician southern paleotropical deposits {{Illinois-geologic-formation-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Platteville Formation
The Platteville Limestone is the Ordovician limestone formation in the sedimentary sequence characteristic of the upper Midwestern United States. It is characterized by its gray color, rough texture, and numerous fossils. Its type locality is Platteville, Wisconsin. It was heavily used in the early decades of the building of Minneapolis–Saint Paul and Faribault, Minnesota. In Illinois, the formation is elevated to group status and referred to as the Platteville Group. Formation Like almost all limestones, the Platteville variety is a marine creation. Platteville Limestone formed between 488 and 436 million years ago, when what became southeastern Minnesota and southwestern Wisconsin lay beneath an ancient sea. This sea was heavily populated by shellfish and other invertebrates. As they died, their shells and other hard parts, made of calcium carbonate, fell to the ocean floor. Over the centuries, the weight of these deposits crushed the shell fragments and compressed them ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
