Geologic Analysis of the Northern Margin of the Boulder Batholith II : Geologic Map of the Esmerelda Hills Quadrangle

Abstract

Southwest Montana experienced large-scale magmatism and regional contraction during the Late Cretaceous. Understanding the genetic linkages between these geologic processes is important for understanding the causes of mountain-building in the Cordillera. Our analysis of the field relationships between the Boulder magmatic system and the folded Paleozoic rocks constrain the sequence of events that shaped the tectonomagmatic evolution of the Helena salient.