Wetumpka Structure, Alabama

Steven Dutch, Natural and Applied Sciences, University of Wisconsin - Green Bay
First-time Visitors: Please visit Site Map and Disclaimer. Use "Back" to return here.


The Wetumpka Impact Structure, Alabama, is a small Tertiary structure just north of Montgomery. A casual visit will quickly show an unusual disturbance of the rocks but little obvious evidence of impact. The upturned Paleozoic rocks look at first glance like any other tectonic uplift. Brecciation is not widespread and the mapped breccia bodies are not easily accessible by road. The most obvious field evidence suggesting impact is the circular plan of the structure; laboratory petrographic studies confirm it.

Wetumpka Structure, Alabama  

Below: the structure (yellow) is just east of the town of Wetumpka on the opposite side of the Coosa River. U.S. 231 runs along the northwest margin of the structure.

Wetumpka Structure, Alabama  

Below: the northern half of the structure is clearly visible in topography and stream patterns.

Wetumpka Structure, Alabama

Wetumpka Structure, AlabamaLeft and below: Tilted Paleozoic rocks along U.S. Highway 231
Wetumpka Structure, AlabamaWetumpka Structure, Alabama
Wetumpka Structure, AlabamaTilted Paleozoic rocks along U.S. Highway 231. What appears to be an overturn at the top is actually due to the way the cut is beveled; the rocks are actually uniformly dipping.
Wetumpka Structure, AlabamaBrecciated and deformed sandstone in the interior of the structure
Wetumpka Structure, AlabamaBrecciated and deformed sandstone in the interior of the structure
Wetumpka Structure, AlabamaView northwest off the rim of the Wetumpka structure
Wetumpka Structure, AlabamaView from Wetumpka across the Coosa River to the rim of the Wetumpka structure.
Wetumpka Structure, AlabamaView from Wetumpka across the Coosa River to the rim of the Wetumpka structure.

Return to Virtual Field Trips Index
Return to Professor Dutch's Home Page

Created 14 July 2003, Last Update 01 July 2012

Not an official UW Green Bay site