Report on the geology of the Henry Mountains

"Report on the Geology of the Henry Mountains" by Grove Karl Gilbert is a scientific publication written in the late 19th century. This work focuses on the geological structure of the Henry Mountains, located in Southern Utah, and is based on field studies conducted during the years 1875 and 1876. It delves deep into the geological formations, rock series, and the intricate processes of geological uplift and erosion that characterize this unique mountain range. At the start of the report, Gilbert discusses the historical context of the Henry Mountains, explaining how they were largely unexplored up until the late 19th century. He notes the contributions of earlier explorers, including Professor John Wesley Powell, who named the mountains. Gilbert describes his thorough examination of the region's structure, highlighting the unique features of each individual mountain within the range and introducing the concept of laccolites—masses of igneous rock that intrude into other rock layers—describing their significance in understanding the geological history of the area. The opening portions set the stage for an in-depth scientific exploration, revealing the importance of the region for geological study and the complexities of its formations.