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Beneath the ponds, the forests, and the light soil covering, however, is a story which must be told not in increments of centuries, but by millions and billions of years. The "ridge-and-trough" pattern of the rocks is the work of millions of years, pre-dating even the formation of Lake Superior and its islands. The story begins some 1.2 billion years ago with a great rift in the earth's crust which may have extended from here southward all the way to the Gulf of Mexico. As this series of cracks poured forth molten lava covering thousands of square kilometers, the land along the rift zone sank to form the Superior Basin, which has shaped all subsequent geological events in the region. The rock record of this cataclysmic happening -- the volcanics, sandstones, and conglomerates -- forms Isle Royale's bedrock today. Clues to the island's past abound. Smoothed, rounded, and even groove rock belies the crushing power of the last major glaciation, known as the Wisconsin. It ended here only a few thousand years ago.
if the long expected mega-eruption at yellowstone happened, how do you think that would react with the possibilities in your op?...
Two Seismic Zones Connect
•Centered in the Wabash River Valley, the Wabash Valley Seismic Zone straddles the state line between southeastern Illinois and southwestern Indiana and spreads into part of western Kentucky. Scientists believe that it is a branch of the New Madrid system, which extends south from Cairo, Illinois, through Missouri, Arkansas, Mississippi and parts of western Tennessee, according to the Arkansas Center for Earthquake Education and Technology Transfer.
Scientists Discover Another Fault
•The 1968 Illinois earthquake or New Madrid event, hit Illinois on November 9, 1968, and measured 5.4 on the Richter scale. It affected 23 states over an area of 580,000 square miles, causing much structural damage to buildings but no fatalities. In researching its cause, scientists discovered the Cottage Grove Fault in the Southern Illinois Basin, which is a small tear in the Earth's rock running west to east under Saline County, near Harrisburg, Illinois. It connects to the north-south running Wabash Valley Fault System at its eastern end.
The Lost River is about 85 miles (137 km) long and its name is derived from the fact that at least 23 miles (37 km) of the primary course of the river flows completely underground. The river's underground channels may in fact cover hundreds of miles, as the underground caverns have never been fully explored. The river disappears into a series of sink holes of the type that are abundant in the karstland of southern Indiana. In one square mile there are as many as 1,022 sink holes. The river slips into and out of these sink holes at various points flowing into hidden underground caverns that connect with multiple other streams, rivers, and springs. The River begins as a normal river in Washington County, but soon after rising, the river flows over and into a limestone bed (karst) for several miles until the stream bed turns dry; the water is absorbed into the limestone and sinks beneath the surface to a hidden cavern. The river then flows underground through a network of caves and channels through part of Orleans Township, Paoli Township, and part of Orangeville Township before reappearing on the surface near the village of Orangeville, Indiana. Where the river rises from surface in Orange County it produces a spring that is 165 feet (50 m) deep with the very bottom connecting to the actual underground channel. This spring is the second largest in the state known as the True Rise because many inaccurately believe the that Orangeville Rise is the main channel of the river. The Orangeville rise is a likely tributary of the underground Lost River. The river then continues its westward flow above ground. The rise in Orangeville unfortunately is not picturesque, but is little more than a gloomy pond that feeds a muddy stream.
Originally posted by ladyinwaiting
This will be one of the most selfish superficial things I have ever said, but good lord, if this happens I hope I am dead and buried when it does.
Originally posted by ladyinwaiting
And Wyn, the entire Yellowstone disaster is just too much to fathom.