William R Thompson wrote:

I wonder why Utah isn't in the kidney stone belt..

I was also wondering if Utah got all the salt from the glaciers (salt lake
city, salt flats)
see salt (and probably other minerals in water and earth and foods)  in the
kidney stone post

The great lakes area was known as the thyroid belt because the glaciers scraped
away the upper layers of earth containing salt (or something like that)
The Bonneville Salt Flats are a 121 km² (47 mi²) salt flat in northwestern
Utah. A remnant of the ancient Lake Bonneville of glacial times, the Salt Flats
are now public lands managed by the Bureau of Land Management.

http://www.saltinstitute.org/idd.html
here are numerous reports in the literature that demonstrate effectiveness of
iodized salt in controlling endemic goiter. Iodization of salt is known to be a
safe, efficient, and preferred prophylactic method for endemic goiter in the
U.S. (Ref. 1). In the early 1900's, goiter was prevalent in those states
bordering the Great Lakes and in the northwestern region of the United States.
Voluntary fortification of salt with iodine was introduced in 1924 and resulted
in a virtual elimination of endemic goiter in the U.S. Some notable examples
are as follows:

http://www.mountainnature.com/Geology/Glaciers.htm
Despite their immense impact on the landscape, glaciers are a relative newcomer
to the mountain scene. The first buildup of ice occurred approximately 240,000
years ago and ended 128,000 BP. It was followed by a period of warmer climate.
There were at least 5 subsequent advances that saw glaciers reclaiming their
valleys. In reality, the ice age was not something that began, and then ended.
It was a series of advances followed by warmer Interglacial Periods. The final
advance was quite recent,  beginning approximately 1200 AD, and ending at the
turn of the 20th century.

Beginning 240,000 years ago and ending 128,000 years ago, a period known as the
Great Glaciation took place. Geologists refer to this period as the Illinoian
Glaciation. This was the period of greatest accumulation, and ice flowed
eastward onto the plains. During its peak, they flowed eastward until they
encountered the large continental glacier that was rapidly expanding westward.
As this advance waned, an ice-free corridor was formed between the retreating
mountain glaciers, and the continental glaciers. During subsequent advances,
this corridor was maintained. Scientists believe it formed a travel route
allowing the ancestors of our native Indians to migrate from Asia to North
America. At the time, Alaska was joined to Siberia by a land bridge...

oh well, I'd have to see a map of glacier (movement) overlaid overtop of
current North America
J