Possible Geodetic Properties and Relationships of Some Monumental Earthworks in the Middle Ohio Valley.

A Preliminary Inquiry   ©2003 by James Q. Jacobs

Squier and Davis Drawings

The Obsevatory, Newark Octagon Circle  3168 x 1784 pixels

Marietta Works
Miamisburg Mound
Milford
Newark Works
Newark Gateway
Octagon Observatory
Paint Creek Works
Portsmouth Detail