Tekla a harms (2 resultados)

Soft cover. Condición: New. The Tobacco Root Mountains occupy a unique niche in the Archean Wyoming province of North America. Located near the northwestern margin of the province, the Precambrian rocks of the Tobacco Root Mountains were subjected to an intense tectonothermal event (Big Sky Orogeny) during the collision of the Wyoming and Hearne provinces in the Early Proterozoic. This event overprinted earlier periods of deformation and metamorphism, but the unique lithologic packages present in the Tobacco Root Mountains aid in unraveling early from later events and in detailing many results stemming from this Early Proterozoic collision. Several papers in this volume review the geochemistry and petrology of the four major Precambrian rock sequences present in the Tobacco Root Mountains, focusing on what each rock suite represents in terms of original protolith and providing the foundation for understanding the extensive petrological and geochronological information that follows. Another paper considers the meta-ultramafic rocks that are dispersed throughout all Precambrian exposures in the Tobacco Root Mountains. Petrologic observations from all four rock suites are interpreted in terms of a metamorphic history and a pressure-temperature path for the Tobacco Root Mountains during the Proterozoic event. Numerous and extensive radiometric age determinations from all four major rock suites are presented subsequent papers. Taken together, the papers provide a solid base for understanding the timing of the tectonothermal events that affected these rock suites and for separating the effects of the last major event in the Early Proterozoic. Finally, two papers examine the structures and fabrics present in the Precambrian rocks and synthesize observed field relations, structures and fabrics with age determinations and metamorphic history into a sequence of events by which the rocks of the Tobacco Root Mountains evolved, placing Tobacco Root geology into the context of the northern Wyoming province. …

Paperback. Condición: New. Orra White Hitchcock brings to light the little-known art of one of the Connecticut River Valley's earliest female artists and a leading scientific illustrator of her generation, from her lyrical images of flora, to her massive classroom wall charts and her picturesque lithographs of the Connecticut and Deerfield Rivers. Robert L. Herbert and Daria D'Arienzo illuminate Hitchcock's life and art and reveal new discoveries and previously unknown drawings. Additionally, Elizabeth Farnsworth contributes an analysis of Hitchcock's watercolors of flowers and grasses from the vantage point of her own work as a botanical illustrator, while geologist Tekla Harms describes how the artist's large classroom drawings supplemented observable phenomena with representations of unseen geological structures crucial to geologic education. This generously illustrated catalogue, produced in conjunction with an exhibition at Amherst College's Mead Art Museum, celebrates the memorable art of a gifted American woman.Catalog complements the exhibit at the Mead Art Museum at Amherst College, Amherst, Massachusetts between January 28-May 29, 2011.…