Middle Proterozoic Belt Supergroup, Western Montana – Great Falls, Montana to Spokane, Washington, July 20–28, 1989, Volume T334

Published by the American Geophysical Union as part of the Field Trip Guidebooks Series, Volume 334.

The foremost wish of the three leaders is that this field trip be a forum for exchange of ideas among all participants. The three of us have differing viewpoints of the Belt basin, and each will present his own ideas. We hope the ensuing discussion will stimulate response from guest participants, whose combined experiences in these kinds of rocks probably exceed ours. We encourage participants to comment and to contribute to further understanding these curious rocks.