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Platteville Limestone
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 the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formation (stratigraphy)
A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics (lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exposed in a geographical region (the stratigraphic column). It is the fundamental unit of lithostratigraphy, the study of strata or rock layers. A formation must be large enough that it can be mapped at the surface or traced in the subsurface. Formations are otherwise not defined by the thickness of their rock strata, which can vary widely. They are usually, but not universally, tabular in form. They may consist of a single lithology (rock type), or of alternating beds of two or more lithologies, or even a heterogeneous mixture of lithologies, so long as this distinguishes them from adjacent bodies of rock. The concept of a geologic formation goes back to the beginnings of modern scientific geology. The term was used by Abraham Gottlob We ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mississippi River
The Mississippi River is the List of longest rivers of the United States (by main stem), second-longest river and chief river of the second-largest Drainage system (geomorphology), drainage system in North America, second only to the Hudson Bay drainage system. From its traditional source of Lake Itasca in northern Minnesota, it flows generally south for to the Mississippi River Delta in the Gulf of Mexico. With its many Tributary, tributaries, the Mississippi's Drainage basin, watershed drains all or parts of 32 U.S. states and two Provinces and territories of Canada, Canadian provinces between the Rocky Mountains, Rocky and Appalachian Mountains, Appalachian mountains. The Mainstem (hydrology), main stem is entirely within the United States; the total drainage basin is , of which only about one percent is in Canada. The Mississippi ranks as the List of rivers by discharge, thirteenth-largest river by discharge in the world. The river either borders or passes through the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Minneapolis
Minneapolis () is the largest city in Minnesota, United States, and the county seat of Hennepin County. The city is abundant in water, with thirteen lakes, wetlands, the Mississippi River, creeks and waterfalls. Minneapolis has its origins in timber and as the flour milling capital of the world. It occupies both banks of the Mississippi River and adjoins Saint Paul, the state capital of Minnesota. Prior to European settlement, the site of Minneapolis was inhabited by Dakota people. The settlement was founded along Saint Anthony Falls on a section of land north of Fort Snelling; its growth is attributed to its proximity to the fort and the falls providing power for industrial activity. , the city has an estimated 425,336 inhabitants. It is the most populous city in the state and the 46th-most-populous city in the United States. Minneapolis, Saint Paul and the surrounding area are collectively known as the Twin Cities. Minneapolis has one of the most extensive publi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Burbank–Livingston–Griggs House
The Burbank–Livingston–Griggs House is the second-oldest house on Summit Avenue in Saint Paul, Minnesota, United States. It was designed in Italianate style by architect Otis L. Wheelock of Chicago and built from 1862 to 1863. The work was commissioned by James C. Burbank, a wealthy owner of the Minnesota Stage Company. With Later, four significant local architects left their mark on the landmark structure. The building was one of the first Minnesota properties nominated to the National Register of Historic Places, in 1970. It was listed for its state-level significance in the theme of architecture. It was nominated for being one of Minnesota's most elaborate examples of mid-19th-century Italianate architecture. In 1976 it was also included as a contributing property to the Historic Hill District. Description The Burbank–Livingston–Griggs House is built of grey limestone and features arched windows, a bracketed cornice with carved pendants, and a cupola topped ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Church Of The Assumption (Saint Paul, Minnesota)
The Church of the Assumption Catholic Church was dedicated in 1874 and is the oldest existing church in Saint Paul. It is located at 51 West Seventh Street, in downtown Saint Paul. The building is listed on the National Register of Historic Places. The parish was founded in 1856 by Bishop Joseph Crétin. At that time, immigrants from Germany were arriving, and the single Catholic parish in St. Paul mainly served French and Irish settlers, with services in Latin and sermons in their own languages. The first building was a plain stone structure with a wooden steeple on West Ninth Street. The founding pastor was Father George Keller. After Fr. Keller was transferred to Faribault, Minnesota in 1858, staffing of the parish was met by priests and brothers from St. John's Abbey (Order of St. Benedict) in Collegeville, Minnesota. By 1869 the parish had outgrown the small chapel and a new building was urgently needed. The church's construction was ordered by then-Archbishop John ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alexander Ramsey House
The Alexander Ramsey House is a historic house museum in Saint Paul, Minnesota, United States; the former residence of Alexander Ramsey, who served as the first governor of Minnesota Territory and the second governor of the state of Minnesota. It was listed on the National Register of Historic Places in 1969. It is also a contributing property In the law regulating historic districts in the United States, a contributing property or contributing resource is any building, object, or structure which adds to the historical integrity or architectural qualities that make the historic distric ... to the Irvine Park Historic District. It is located at 265 Exchange Street South in the Irvine Park area, which was one of the first trendy neighborhoods in Minnesota. Designed by noted early Minnesota architect Monroe Sheire, the house is one of the nation's best-preserved Victorian homes, featuring carved walnut woodwork, marble fireplaces, crystal chandeliers, and many original f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Downtown Saint Paul
Downtown Saint Paul is the central business district of Saint Paul, Minnesota, United States. Its boundaries are the Mississippi River to the south, University Avenue to the north, US 52 to the east, and Kellogg Avenue to the west. It is bounded by the Dayton's Bluff, Summit-University, West Seventh, Frogtown, West Side, and Payne-Phalen neighborhoods. The West Side neighborhood is on the other side of the river, and can be accessed via the Robert Street Bridge or the Wabasha Street Bridge. Interstate 35E and Interstate 94 run through the north side of the neighborhood, providing a separation between the Minnesota State Capitol and other state government buildings with the rest of downtown. Government The Minnesota State Capitol is located on the northern fringe of the downtown neighborhood. Work began on the current capitol in 1896, and construction was completed in 1905. The early 1950s saw the development of the expansive mall that currently surrounds the capitol. This ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fort Snelling
Fort Snelling is a former military fortification and National Historic Landmark in the U.S. state of Minnesota on the bluffs overlooking the confluence of the Minnesota and Mississippi Rivers. The military site was initially named Fort Saint Anthony, but it was renamed Fort Snelling once its construction was completed in 1825. Before the American Civil War, the U.S. Army supported slavery at the fort by allowing its soldiers to bring their personal enslaved people. These included African Americans Dred Scott and Harriet Robinson Scott, who lived at the fort in the 1830s. In the 1840s, the Scotts sued for their freedom, arguing that having lived in "free territory" made them free, leading to the landmark United States Supreme Court case '' Dred Scott v. Sandford''. Slavery ended at the fort just before Minnesota statehood in 1858. The fort served as the primary center for U.S. government forces during the Dakota War of 1862. It also was the site of the encampment where eastern D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trilobites
Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period () and they flourished throughout the lower Paleozoic before slipping into a long decline, when, during the Devonian, all trilobite orders except the Proetida died out. The last extant trilobites finally disappeared in the mass extinction at the end of the Permian about 252 million years ago. Trilobites were among the most successful of all early animals, existing in oceans for almost 270 million years, with over 22,000 species having been described. By the time trilobites first appeared in the fossil record, they were already highly diversified and geographically dispersed. Because trilobites had wide diversity and an easily fossilized exoskeleton, they left an extensive fossil record. The stu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cephalopods
A cephalopod is any member of the molluscan class Cephalopoda (Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot. Fishers sometimes call cephalopods "inkfish", referring to their common ability to squirt ink. The study of cephalopods is a branch of malacology known as teuthology. Cephalopods became dominant during the Ordovician period, represented by primitive nautiloids. The class now contains two, only distantly related, extant subclasses: Coleoidea, which includes octopuses, squid, and cuttlefish; and Nautiloidea, represented by ''Nautilus'' and ''Allonautilus''. In the Coleoidea, the molluscan shell has been internalized or is absent, whereas in the Nautiloidea, the external shell remains. About 800 living species of cephalopods have been identified. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brachiopods
Brachiopods (), phylum Brachiopoda, are a phylum of trochozoan animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopod valves are hinged at the rear end, while the front can be opened for feeding or closed for protection. Two major categories are traditionally recognized, articulate and inarticulate brachiopods. The word "articulate" is used to describe the tooth-and-groove structures of the valve-hinge which is present in the articulate group, and absent from the inarticulate group. This is the leading diagnostic skeletal feature, by which the two main groups can be readily distinguished as fossils. Articulate brachiopods have toothed hinges and simple, vertically-oriented opening and closing muscles. Conversely, inarticulate brachiopods have weak, untoothed hinges and a more complex system of vertical and oblique (diagonal) muscles used to keep the two valves aligned. In many brachiopods, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bryozoans
Bryozoa (also known as the Polyzoa, Ectoprocta or commonly as moss animals) are a phylum of simple, aquatic invertebrate animals, nearly all living in sedentary colonies. Typically about long, they have a special feeding structure called a lophophore, a "crown" of tentacles used for filter feeding. Most marine bryozoans live in tropical waters, but a few are found in oceanic trenches and polar waters. The bryozoans are classified as the marine bryozoans (Stenolaemata), freshwater bryozoans (Phylactolaemata), and mostly-marine bryozoans (Gymnolaemata), a few members of which prefer brackish water. 5,869living species are known. At least two genera are solitary (''Aethozooides'' and '' Monobryozoon''); the rest are colonial. The terms Polyzoa and Bryozoa were introduced in 1830 and 1831, respectively. Soon after it was named, another group of animals was discovered whose filtering mechanism looked similar, so it was included in Bryozoa until 1869, when the two groups were n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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