06/17/2026
The Midwest may have once been slammed by a super rare "serial" meteorite strike. 😲🌠🌠
For hundreds of miles, mysterious circular landforms align like cosmic footprints, tracing an invisible path across the heartland of America.
Known as the 38th parallel structures, this remarkable chain stretches for about 400 miles (643 km) from southern Illinois, through Missouri, and into eastern Kansas.
Some of these structures are estimated to be nearly 300 million years old, their original craters softened and obscured by time, sediment, and erosion.
Geologists have confirmed that at least two of the structures—Decaturville and Crooked Creek—are indeed ancient meteorite impact craters. Another, the Weaubleau-Osceola structure, may also be the scar of a colossal collision, though its origins remain hotly debated.
Others may actually have a volcanic origin, such as Hicks Dome in Illinois—one of the most dramatic of the structures.
From the surface, it looks like just another hill or bluff, but deep below the ground, the center of Hicks Dome has been thrust upward more than 4,000 feet (1,220 meters) above the rest of the formation—evidence of immense forces at work from *beneath* the surface.
Although the 38th parallel structures appear to be a mixture of impact and volcanic structures, the near-perfect alignment has sparked fascinating speculation about how they could have formed in such a straight line.
In the 1990s, scientists proposed that a serial meteorite strike—a chain of impacts similar to the 1994 Shoemaker-Levy 9 comet collision with Jupiter—could explain this unusual pattern, even though such events are considered exceptionally rare on Earth.
Whether forged by asteroid impacts or volcanic upheavals, the 38th parallel structures remain a captivating enigma—blending science, geology, and natural history into one of the Midwest's most intriguing landscapes.
Source: Wikipedia