The excerpt below is from an interesting article by Dana Larsen in the Storm Lake Pilot Tribune. Click on the link below to read the entire piece.
[Jason]Titcomb [at a recent meeting at the Sanford Museum in Cherokee, Iowa] revealed that he and his volunteers have discovered 13 petroglyphs - prehistoric art carved stone-on-stone - on the 61-foot-long Sioux Quartzite boulder south of Cherokee that was depositied by a glacier 20,000 years ago.
Long before white settlers used this marker to find the fertile valley where Cherokee was founded, ancient trails led Native American travelers to the landmark, which they called "Woven Stone."
The first simple petroglyph on the stone was documented in the 1930s. In 2000, an expert decided to revisit the stone to see if he could find the carved marking mentioned by the earlier explorer, and while there, recorded another artwork.
Titcomb heard about the site and decided to take students to visit, and has since documented the remainder of the works. Worn by time and weather, they can often be seen only in a 15-minute time window on an ideal day, when the lighting is at the correct angle.
Some of the markings are what is commonly referred to as "turkey tracks" (think peace symbol without the outer circle) - and have been documented on sacred stone locations elsewhere around North America.
The illustration of Ioway leader White Cloud the Younger (a.k.a. Frank White Cloud) accompanying the online article below is erroneous since he died in the mid-1800s.