From time to time the question is raised as to where to draw the boundary between the Oligocene and Miocene in the United States. This is a question that has little practical importance because it does not affect in any way the local correlation of geologic formations in North America. The answer to it depends on, first, the decision as to where to draw the boundary in Germany and Belgium, where the Oligocene is typically developed, and, second, the accurate correlation of the Upper Oligocene and Lower Miocene beds of Europe with formations in North America. If there are intermediate...
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
