This image is a well known formation visited by boat tours through the Wisconsin Dells. Called by the fanciful name Sugar Bowl, due to its rounded and tapering shape, it is an example of many such free-standing formations in the waters around the Dells.

The caption states:

Here at the Wisconsin Dells, a lavish display of sculptural wonders in their primeval state of undespoiled natural beauty are found. Traveling along the winding shores of the river one has the thrilling feeling of being transported back through thousands of timeless years when nature first began to carve mystic shapes and forms for her gigantic outdoor museum. One of these formations, the “Sugar Bowl”, stands amid the swirling waters of the stream, boldly battling with the force of erosion.

— This image is also represented in a folio posted earlier on this site. In fact, the two pictures are identical and come from the same publisher, differing only in the colorizing and sky illustration applied. The white line in the middle of the image is damage caused by the card being folded.

This image likely dates from the 1940s.