Iowa's (Lite) EarthCache Challenge. Mystery Cache

EarthCaches are a type of geocache that are listed on geocaching.com. They use additional guidelines when developed so that they provide a unique experience - a learning experience about Earth science!

An EarthCache site is a special place that people can visit to learn about a unique geoscience feature or aspect of our Earth. Visitors to EarthCache sites can see how our planet has been shaped by geological processes, how we manage the resources and how scientists gather evidence to learn about the Earth.

This Challenge cache,
which is at the posted coordinates,
will highlight EarthCaches.

In order to log this Challenge,
you must have logged 50 (fifty) EarthCaches.

You may document that you qualify for this Challenge any way you wish.
(Screen capture from your profile, bookmark, listing in log, etc).