Editing Weaubleau structure (section)

==Round rocks==
[[Image:Missouri round rock.jpg|thumb|200px|One of the "round rocks" found in [[Osceola, Missouri]]]]
{{see also|Weaubleau egg}}

Long thought to be a glacial remnant, these [[Conglomerate (geology)|conglomerate]] rocks are found in the area of the Weaubleau structure. They are nearly perfectly round, and are referred to locally simply as "geodes", "round rocks", "Missouri rock balls", or "Weaubleau eggs".<ref name=Evans/>

It has been suggested that the round rocks are [[chert]] [[concretion]]s or nodules. The round rocks may have formed when the impact threw [[shale]] [[clastic rock|clast]]s of the [[Northview Formation]] away from the center of the impact structure and subsequent silica-saturated waters precipitated silica around the shale clasts. The formation of the round rocks is poorly understood and requires further research.<ref name=Evans/>