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While Lamb's analysis assumed a straight wavefront, it has been shown [8] that the same characteristic equations apply to cylindrical plate waves (i.e. waves propagating outwards from a line source, the line lying perpendicular to the plate). The difference is that whereas the "carrier" for the straight wavefront is a sinusoid, the "carrier ...
The Lamb Site (11SC24) is an archeological site located in the central Illinois River Valley (CIRV). Excavations of this site began in the 1990s to attempt to understand the Mississippinization of the area following several generations after the intervention of the Cahokians before Columbus's discovery of America. During the eleventh and ...
Detail of Plate A headdress Emmons Mask Plate B Plate C, with reconstructed tail based on Upper Bluff Lake plate Plate E. The eight plates are designated Plates A–H. Except for Plate B, which has two heads, all of the figures face to the right. All of the plates are missing the majority of their tail sections due to being struck by Groomes' plow.
The Kincaid Mounds Historic Site (11MX2-11; 11PO2-10) [3] c. 1050–1400 CE, [4] is a Mississippian culture archaeological site located at the southern tip of present-day U.S. state of Illinois, along the Ohio River.
Plates with serials 1 through 999 had "ILL-34" at the bottom; plates with serials 1000 through 9999 had "ILLINOIS-34"; and plates with serials 10-000 and up had "ILLINOIS-1934". The latter two groups were the first plates to feature the full state name. 1935 Blue on white with border line; "ILL-35", "ILLINOIS-35" or "ILLINOIS-1935" at top none
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Rayleigh waves are a type of surface acoustic wave that travel along the surface of solids. They can be produced in materials in many ways, such as by a localized impact or by piezo-electric transduction, and are frequently used in non-destructive testing for detecting defects.
The type locality is the Mazon River (or Mazon Creek), a tributary of the Illinois River near Morris, Grundy County, Illinois. The 25 to 30 meters of shale were formed approximately , during the Pennsylvanian period. The fossiliferous concretions are usually found within the thickest deposits of the Francis Creek Shale.