Structures in the Columbia River Basalt around Odessa, Washington, are interpreted as forming by downward sag and foundering of the crust of a partly solidified flow, and upward escape of lava from the fluid interior along outward-dipping concentric dikes. The resulting structure, herein termed a sag flowout structure, is described in the belief that similar structures will be found elsewhere in flood basalts.

First Page Preview

First page PDF preview
You do not currently have access to this article.