Background. Aseptic meningitis is an illness characterized by serous inflammation of the linings of the brain (i.e., meninges), usually with an accompanying mononuclear pleocytosis. Clinical manifestations vary, with headache and fever predominating.
Fire and ice, in the form of volcanoes and glaciers, created Lake Superior. That happened long before Jake came here to fish. One billion years ago, molten basalt erupted from the mid-continent rift, which extended from near Thunder Bay, Ontario, to Kansas.ire and ice, in the form of volcanoes and glaciers, created Lake Superior. That happened long before Jake came here to fish. One billion years ago, molten basalt erupted from the mid-continent rift, which extended from near Thunder Bay, Ontario, to Kansas.
Mid-Continent Rift Saint Lawrence Rift These rifts are responsible for the great depths of Lakes Superior and Ontario Deep valleys formed as tectonic plates pulled apart Valleys are now deepest regions of these two lakes Midcontinent Rift 1.1 to 1.2 billion years ago two previously fused tectonic plates split apart and created the Midcontinent Rift. A valley was formed providing a basin that eventually became modern day Lake Superior. Rocks rich in copper and silver in Michiganâs UP Saint Lawrence Rift