SATURDAY AT 1 PM
Lectures are FREE for museum members — $5.00 for non-members.
MARCH 24TH: Buzzsaws, Scissors, and Blades: Unraveling the evolution of unusual shark dentition in the fossil record. By Jesse Pruitt (Idaho Museum of Natural History)
MARCH 25TH: Meteors and Meteorites – History, Mystery, and Magic by Patrick Cavanaugh (IMMG)
APRIL 28TH: A Natural History of Basalt by Terry Maley P.G.
Basalt is one of the most recognizable and common rocks in the Earth’s crust. It originates in the mantle and makes up a 1- to 2-mile-thick layer of pillow lavas and sheeted dikes in the oceanic crust. Most of the seamounts and islands in the ocean basins consist of basalt, including some of the largest volcanoes on Earth. The Large Igneous Provinces, including the Columbia River Basalt, are all composed of basalt. Basalt has a wide range of compositions, textures, distinctive structures and landforms. Most significantly, basalt plays an important role in the origin of rhyolite and granitic rocks.
MAY 12TH: Putting it back the way we found it: Mine Site Remediation and Restoration by Historian Troy Lambert
We were all taught in kindergarten to put things back where they belonged and when we were done playing with something we were taught to put it back the way we found it. While modern mining is clean and well regulated, it wasn’t always that way. So while we can’t go back in time, we can re-mediate old mine sites and restore the area around it. Who is financially responsible for these actions? How do we go about them? What are the best solutions going forward? This talk will answer these questions and more.
JUNE 9th: Why is it that color? by Terry Panhorst (University of Mississippi)
Color is one of the first properties noticed about rocks and minerals. Gemstones are often identified and classified by their color. Few minerals, however, actually have a characteristic color, and many minerals can occur in a large range of colors. Visible light, a form of electromagnetic energy, is what our eyes perceive as color, and within our population there is a range in color perception. The color of any particular mineral is the combinations of light wavelengths not absorbed when white light, which is the combination of all wavelengths, is reflected or transmitted through the mineral. Examples will be shown where mineral color is determined by the presence of particular elements, the electron charge of those elements, and how atoms are positioned within the crystalline structure. Variations in color can also be caused by defects in the crystalline structure or by chemical impurities in the mineral.