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Reference.org
38th parallel structures
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<p>The 38th parallel structures, also known as the 38th parallel lineament, are a series of seven circular depressions or deformations stretching 700 kilometres (430 mi) across southern <a href="/facts/Illinois/MuPb1Ctn">Illinois</a> and <a href="/facts/Missouri/wQ3VAb99">Missouri</a> and into eastern <a href="/facts/Kansas/koenIXmE">Kansas</a>, in the United States, at a <a href="/facts/Latitude/IBYqkjhU">latitude</a> of roughly <a href="/facts/38th_parallel_north/s0j3mcq6">38 degrees north</a>. Estimated at 300 million years old, three are believed to be <a href="/facts/Impact_event/fbWu9Q4p">impact events</a> from meteorites, but other structures are possibly remnants of <a href="/facts/Volcano/c2M5upml">volcanos</a>. </p>