MAPS:

MIMA MOUNDS:

Commonly referred to as Mima Mounds because Mima County Washington was one of the first places they were studied.

Some facts about the Mima Mounds also know as pimple mounds and many different names around the world.

Mima Mounds can be found on all continents except Antarctica.
Mima Mounds can be found on isolated islands such as Easter Island.
Mima Mounds appear only in the recent geological record of the last 300,000 years ago or less.
Mima Mounds have been through at least one ice age, the Wisconsin, and probably 2 or more.
By conservative estimates Mima Mounds cover about 10% of the Earth's continental surfaces at present.
It is possible that when Mima Mounds initially appeared that they covered 50% or more of the Earth's continental surfaces.
All Mima Mounds look to be of a similar age.
Most of the original Mima Mounds have been destroyed by the activities of both nature and man.
No Mima Mounds can be found in the process of being created.
No new Mima Mounds are being created.

The process that created the Mima Mounds:

happened only once in Earth's geological history.
happened recently, geologically speaking, possibly between 200,000 to 300,000 years ago.
may have covered 50% or more of the continental surfaces of the planet.
created Mima Mounds on almost every type of terrain on the planet.
created Mima Mounds from islands south of South America to islands north of the Hudson Bay.
created complete mounds and there are no mounds in the process of being constructed have ever been found.
The process has eluded science for over 150 years, though not for a lack of effort.

Surprisingly, few people even know the mounds exist.

The world map shows only a very small portion of Mima Mound locations around the world. Coverage is best in the Western U.S.

There are artificial stone decorations on the Mima Mounds of the Weed field in the southern Shasta Valley.

These decorations are very substantial.

The approach here has been to investigate the stone decorations from three directions.