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Susceptibility weighted imaging (SWI), originally called BOLD venographic imaging, is an MRI sequence that is exquisitely sensitive to venous blood, hemorrhage and iron storage. SWI uses a fully flow compensated, long echo, gradient recalled echo (GRE) pulse sequence to acquire images.
The geology of Missouri includes deep Precambrian basement rocks formed within the last two billion years and overlain by thick sequences of marine sedimentary rocks, interspersed with igneous rocks by periods of volcanic activity. Missouri is a leading producer of lead from minerals formed in Paleozoic dolomite. [1]
This area contains old fields, forest, cropland, prairie, and 2 small wetlands. The area features 1 designated camping area (primitive) and the 30-acre (120,000 m 2 ) Helton Prairie Natural Area, which features unique wildflower displays from mid-May until early July.
North of the airport, it flows northeast through the communities of Hazelwood, Berkeley, Florissant, Old Jamestown, Black Jack, and Spanish Lake. [2] According to St. Louis Magazine, "It runs past schools, golf courses, and soccer fields." [2] The creek terminates at the Missouri River between the Lewis Bridge and the Columbia Bottom ...
While several points have been found on the cutbank, three San Patrice and two Dalton points have been found in situ. Also found was the debitage from what appears to have been a lithic workshop, with many flakes and broken performs (Chandler 2001a; Lopinot et al. 1998:40-41; Ray et al. 1998:77-78).
The formal geological name for the Lead Belt is the "Southeastern Missouri Mississippi Valley-type Mineral District". It contains the highest concentration of galena (lead(II) sulfide) in the world [2] as well as significant economic quantities of zinc, copper and silver and currently mined sub-economic quantities of metals such as cadmium, nickel and cobalt. [2]
The Weldon Spring Conservation Area, is a 8,398-acre (33.99 km 2) conservation area that is owned and managed by the Missouri Department of Conservation and located in St. Charles County, Missouri. The area borders the Missouri River, and the Katy Trail runs through the area but is not considered part of the conservation area. [1]
The site is located on a high sand terrace above the Des Moines River floodplain off Clark County Road 188 two miles south-southeast of St. Francisville, Missouri. [6] [7] [8] A walking trail of one and a quarter miles has interpretive signage, the remains of a typical Illinois Tribe–style long house, an oxbow lake, and an example of an Illinois round house. [9]