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SUMMARY:Special Online Presentation—Minerals of Georgia with Julian Gray
DESCRIPTION:When: May 16\, 2023\, 7pm\nThe meeting will be broadcast on Facebook live and to AGS members via zoom.\nSpeaker Bio: Julian Gray is a mineralogist at Focal Point Mineralogy\, LLC\n(focalpointmineralogy.com). He is former curator of Tellus Science Museum in Cartersville\, Georgia and the Rice Northwest Museum of Rocks and Minerals\, in Hillsboro\, Oregon. Julian also served as Executive director of the Rice Museum. A Georgia native\, Julian studied at Georgia State University where he earned his Bachelor of Science and Master of Science degrees in geology. He received additional training in micro-analytical techniques from the McCrone Research Institute in Chicago\, Illinois. Julian has worked with the U.S. Geological Survey and several commercial laboratories and environmental consulting firms. Julian lives in\nHillsboro\, Oregon with his wife\, Barb Epstien. \nAbstract: For the May 16th meeting\, Julian Gray\, co-author of the newest edition of the Minerals of Georgia\, will take us through the diverse mineral heritage of Georgia. The geology of Georgia encompasses a wide\nrange of rocks from Precambrian basement rocks\, Paleozoic sedimentary rocks\, igneous including pegmatites\, metamorphosed sedimentary and volcanic rock\, and unconsolidated sediments. Each of these environments host interesting mineral deposits of interest to mining and mineral collectors. To mineral collectors\, Georgia is best known for its amethyst from Jacksons Crossroads; beryl\, tourmaline\, and rose quartz from the Hogg Mine; and rutile\, lazulite\, ad iridescent hematite from Graves Mountain. But there are many active and historic mineral collecting localities in this state. For instance\, Georgia and North Carolina\nwitnessed America’s first gold rush in the early 1800s. Georgia’s famous marble mines have also produced spectacular\, but rare calcite specimens. Early in the Twentieth Century\, corundum was being actively mined\nin NE Georgia. During World War II\, Georgia’s pegmatites were exploited for beryllium and mica. Although many Georgia collecting sites are extinct or closed to collecting\, there are still many collecting sites that\nproduce minerals from lapidary material to rare micro-minerals.
URL:https://atlantageologicalsociety.org/event/special-online-presentation-minerals-of-georgia-with-julian-gray/
LOCATION:GA
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SUMMARY:AGS Monthly Meeting
DESCRIPTION:Speaker: Randall Carlson \nTopic: Ice Age Megafloods\, Hypervelocity Impacts and the Energy Paradox \nSpeaker bio: Growing up in the glacially sculpted landscapes of rural Minnesota\, Randall Carlson developed a fascination with natural history at an early age. Regular outings to places like the Wisconsin Dells and the St. Croix wild and scenic river with its collection of giant potholes stimulated an interest in geology and the forces that created such unique features. A summer after high school hiking and camping across the American west confirmed his interest in Earth history and he subsequently embarked on a lifelong avocational study of the geological sciences. Following in his father’s footsteps as a builder he learned that geological knowledge aided his professional endeavors in many ways such as understanding the properties of building stone\, groundwater hydrology\, soil properties and so on. o increase his knowledge\, Randall enrolled in Dr. Pamela Gore’s geology program at Perimeter College in the early 1990s and somehow managed to earn Outstanding Geology Student of the Year Award. After that his geological interests intensified and he spent all his spare time studying the literature and going on field excursions\, often with professionals in the field. He became especially interested in the evolving insights of catastrophic geology and traveled extensively investigating such things as megafloods\, glacial geomorphology and the effects of hypervelocity impacts. He now leads geologically oriented tours and hosts a podcast Kosmographia.com where he shares his love of Earth history. \nAbstract: Since the 1920s and the work of J Harlan Bretz\, there has been a growing realization that colossal megafloods have been part of the Earths geological story. Such floods are closely associated with the phenomenon of glaciation as rapidly melting glacial ice is the primary source for the copious volumes of water comprising these floods. Following the advent of radiocarbon dating\, it became apparent that the deglaciation processes occurred much faster than previously assumed. This led to a realization that the known energies available to effect deglaciation were inadequate and hence led to the still unresolved “energy paradox.” Since the 1980s there has been a growing realization that hypervelocity impacts of cosmic bodies have played a critically important role in Earth history. There has also been a growing awareness that the end of the most recent ice age ca. 12 to 14 thousand years ago involved catastrophic climate changes in addition to megaflooding and a severe mass extinction of late Pleistocene megafauna. The most extreme of these climatic shifts is called the Younger Dryas and for decades presented a major challenge to workers to explain. In 2007 it was proposed that a major cosmic impact event occurred at the lower Younger Dryas boundary ca 12\,900 BP\, and since then a considerable amount of evidence has continued to accumulate supporting this interpretation. In this lecture and presentation Randall will present updated evidence that a major impact event occurred\, likely involving multiple pieces of a fragmenting comet and that at least several of these pieces impacted the great ice sheets of both North America and northern Europe directly\, with calamitous consequences.
URL:https://atlantageologicalsociety.org/event/ags-monthly-meeting-15/
LOCATION:Fernbank Museum\, 767 Clifton Rd\, Atlanta\, GA\, 30307\, United States
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