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Impact Crater

 

 

 

The location of the Wetumpka Astrobleme —“star-wound”— originated from a cosmic event that occurred some 80 to 83 million years ago. It was confirmed only recently, after more than two years of extensive investigation and deep earth core drilling conducted on site. It is one of the few above-ground impact crater locations in the United states and one of only about six in the entire World. Even more unusual is the fact that the structure is actually exposed (as you can see from the rim evidence in these photographs). Despite the weathering that has occurred through millions of years, the crater walls are still prominent, so the rim was obviously much higher at one time. The projectile of the meteor impact was probably travelling between 10 and 20 miles per second. So this means the impact would have produced winds in excess of 500 miles per hour, and the meteor most likely struck at a 30-45 degree angle as it came from the northeast. They determined that it came from the northeast by the angle at which the rocks are slanted within the impact area which includes the current flow path of the Coosa River. This can be seen looking from both directions on the Bibb Graves Bridge.

Geologists speculate that the shock waves, the damage, and other effects of the impact explosion radiated out from the strike several hundred miles. Debris may have been thrown as far away as the present Gulf of Mexico. Geologists also theorize that the strike area would have been under a shallow sea, perhaps 300 to 400 feet of water, that covered most of southern Alabama at the time of the impact.

It is estimated that the diameter of the meteorite to be 1,100 feet and could have been as much as three to four times larger. Rock samples were obtained for laboratory analysis for evidence of “shocked quartz.” Quoting from an article in The Wetumpka Herald published on July 1, 1999, “Another piece of evidence confirming meteoritic impact was uncovered …the unusual amounts of iridium, an element relatively common in asteroids and meteorites, but relatively uncommon in the Earth’s crust. Iridium, detected in amounts of approximately 200 parts per trillion within Wetumpka drill-core samples, is considered an anomalously high concentration. This discovery is important proof that an asteroid vaporized upon impact, thus contributing some of its iridium atoms to crater-filling rocks. Discovery of iridium abundance at Wetumpka follows the February 1999 announcement of the discovery of impact-produced shocked quartz in the core samples. Shocked quartz grains are found only in impact craters, and their discovery is considered the most important means of proving meteoritic impacts of the past.

One distinctively unique feature is its horseshoe-shaped ridge of rock which is not submerged in water or covered or eroded beyond visibility. In spite of the millions of years of weathering, the crater walls are still prominent with the rim approximately three to four miles wide.

A panoramic view of the highest point on the crater rim at Bald Knob Mountain is visible from routes into town. The Coosa River flows across the western edge of the crater. From the Bibb Graves Bridge one can easily see the upturned rock tilting in the direction of the crater. Outcroppings of dramatically upturned rock formations are visible along US Highway 231.


There is a Crater Impact Commission consisting of six members—three appointed by the City of Wetumpka and three appointed by the Elmore County Commission. They will be holding public hearings regarding the future development and use of this very rare anomaly in our City, including an interpretative center located on Highway 231 in Wetumpka, AL.

 

 

 

This Town Celebrates Every New Year with a Falling Meteor

by SUSIE MURPH on JANUARY 3, 2014

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Video from YouTube User Pam Bergmann

The popular jazz tune “Stars Fell on Alabama” was inspired in part by the Leonid meteor shower in November of 1833, sometimes referred to as “the night the stars fell.” But the central region of Alabama region has a history of meteorite impacts, including a massive impact over 84 million years ago. The town of Wetumpka, Alabama sits in the middle of an ancient 8-kilometer-wide impact crater that was blasted into the bedrock, creating the unique geology of what is now Elmore County.

To celebrate this “striking” heritage, Wetumpka celebrates every New Year’s Eve with a spectacular recreation of a falling, exploding meteor.


Wetumpka Impact Crater geology. Credit: Auburn Astronomical Society

Wetumpka Impact Crater geology. Credit: Auburn Astronomical Society

Geologists have pieced together the events from millions years ago, when an asteroid nearly the size of a football stadium crashed into what was at the time a coastal basin covered with a shallow sea. The jumbled and disturbed geology of the area hadn’t made sense to local geologists since they started studying it in the 1800′s, and they had no explanations until mapping in the early 1970′s showed that the rocky layers were pointing away from a central location, which led them to suspect some sort of large impact.

However, this location wasn’t verified as an impact crater until fairly recently, when core samples drilled in 1998 confirmed the impact by detecting the presence of shocked quartz. The Wetumpka Impact Crater was officially recognized in 2002, and is now considered to be the best preserved marine impact crater ever discovered.

Meteor Drop, Wetumpka, Alabama (TripAdvisor)Credit: Peggy Blackburn The Wetumpka Herald

Meteor Drop, Wetumpka, Alabama (TripAdvisor)Credit: Peggy Blackburn The Wetumpka Herald

And so, in honor of this history, the folks of Wetumpka have been ringing in the new year by having their own ‘meteor’ streak across the sky and drop to the ground, guided by a wire and followed by fireworks. This event has been recognized as one of the top 10 unique New Year’s Celebrations in the U.S. by TripAdvisor.

You can see the preparation for the event at WSFA 12′s story here.
For more information regarding the crater, visit these sites:

Also, I was born in Wetumpka, so Happy New Year!


Susie Murph is Producer/Social Media Manager at Universe Today. Among other things, she works with the Astronomy Cast, the Weekly Space Hangout and Virtual Star Party.

 

Tagged as: impact crater, meteor


 

 

Wetumpka Impact Crater Commission: http://www.wetumpkaimpactcratercommission.com/ 
 

Earth Impact Database - Wetumpka: http://www.unb.ca/passc/ImpactDatabase/images/wetumpka.htm