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RL Hanna Radiometric Dating Calculate the ages of the samples from the info given below. Compare your answers to those presented on the USGS webpage http://pubs.usgs.gov/gip/geotime/radiometric.html no=amount of parent material left n t = amount of parent material at the beginning Calc Age Years Sample 14 14 Cloth wrappings from a mummified bull P-D C -N Samples taken from a pyramid in Dashur, Egypt. This date agrees with Y=no/nt = 0.7803719661 the age of the pyramid as estimated from historical records Charcoal P-D C14-N14 Sample, recovered from bed of ash near Crater Lake, Oregon, is from a tree burned in the violent eruption of Mount Mazama which created Crater Lake. This eruption blanketed several States with ash, providing Y=no/nt = 0.447880803 geologists with an excellent time zone. Charcoal Sample collected from the "Marmes Man" site in southeastern Washington. This rock shelter is believed to be among the oldest known inhabited sites in North America Spruce wood Sample from the Two Creeks forest bed near Milwaukee, Wisconsin, dates one of the last advances of the continental ice sheet into the United States. Bishop Tuff Samples collected from volcanic ash and pumice that overlie glacial debris in Owens Valley, California. This volcanic episode provides an important reference datum in the glacial history of North America. Volcanic ash Samples collected from strata in Olduvai Gorge, East Africa, which sandwich the fossil remains of Zinjanthropus and Homo habilis -possible precursors of modern man. Monzonite Samples of copper-bearing rock from vast open-pit mine at Bingham Canyon. Utah. Quartz monzonite Samples collected from Half Dome, Yosemite National Park, California. Conway Granite Samples collected from Redstone Quarry in the White Mountains of New Hampshire. Rhyolite Samples collected from Mount Rogers, the highest point in Virginia. Pikes Peak Granite Samples collected on top of Pikes Peak, Colorado. Gneiss Samples from outcrops in the Karelian area of eastern Finland are believed to represent the oldest rocks in the Baltic region. The Old Granite Samples from outcrops in the Transvaal, South Africa. These rocks intrude even older rocks that have not been dated. Morton Granite Samples from outcrops in southwestern Minnesota are believed to represent some of the oldest rocks in North America. ? ? 14 14 P-D C -N Y=no/nt = 0.293638225 ? 14 14 P-D C -N Y=no/nt = 0.244615273 ? P-D Ur235 -Pb207 Y=no/nt = 0.999311029 ? P-D K40-Ar40 Y=no/nt = 0.999030065 ? P-D K40-Ar40 Y=no/nt = 0.979420298 ? P-D K40-Ar40 Y=no/nt = 0.956608158 40 ? 40 P-D K -Ar Y=no/nt = 0.905006463 238 ? 206 P-D Ur -Pb Y=no/nt = 0.880597595 238 206 P-D Ur -Pb Y=no/nt = 0.85238372 P-D Th 232 -Pb208 Y=no/nt = 0.874871391 ? ? ? P-D Th 232 -Pb208 Y=no/nt = 0.853479598 87 ? 87 P-D Rb -Sr Y=no/nt = 0.9501515238 ? RL Hanna Radiometric Dating Answers Sample Cloth wrappings from a mummified bull P-D C14-N14 Samples taken from a pyramid in Dashur, Egypt. This date agrees with Y=no/nt = 0.7803719661 the age of the pyramid as estimated from historical records Charcoal P-D C14-N14 Sample, recovered from bed of ash near Crater Lake, Oregon, is from a tree burned in the violent eruption of Mount Mazama which created Y=no/nt = 0.447880803 Crater Lake. This eruption blanketed several States with ash, providing Charcoal Sample collected from the "Marmes Man" site in southeastern Washington. This rock shelter is believed to be among the oldest known inhabited sites in North America Spruce wood Sample from the Two Creeks forest bed near Milwaukee, Wisconsin, dates one of the last advances of the continental ice sheet into the United States. Bishop Tuff debris in Owens Valley, California. This volcanic episode provides an Volcanic ash Samples collected from strata in Olduvai Gorge, East Africa, which sandwich the fossil remains of Zinjanthropus and Homo habilis -possible precursors of modern man. Monzonite Samples of copper-bearing rock from vast open-pit mine at Bingham Canyon. Utah. Quartz monzonite Samples collected from Half Dome, Yosemite National Park, California. Conway Granite Samples collected from Redstone Quarry in the White Mountains of New Hampshire. Rhyolite Samples collected from Mount Rogers, the highest point in Virginia. Pikes Peak Granite Samples collected on top of Pikes Peak, Colorado. Gneiss Samples from outcrops in the Karelian area of eastern Finland are believed to represent the oldest rocks in the Baltic region. The Old Granite Samples from outcrops in the Transvaal, South Africa. These rocks intrude even older rocks that have not been dated. Morton Granite Samples from outcrops in southwestern Minnesota are believed to represent some of the oldest rocks in North America. Calc Age Years 2,050 6,640 P-D C14-N14 Y=no/nt = 0.293638225 10,130 P-D C14-N14 Y=no/nt = 0.244615273 235 11,640 207 P-D Ur -Pb Y=no/nt = 0.999311029 P-D K40-Ar40 Y=no/nt = 0.999030065 700,000 1,750,000 P-D K40-Ar40 Y=no/nt = 0.979420298 37,500,000 P-D K40-Ar40 Y=no/nt = 0.956608158 40 80,000,000 40 P-D K -Ar Y=no/nt = 0.905006463 P-D Y=no/nt = P-D Y=no/nt = P-D 238 180,000,000 206 Ur -Pb 0.880597595 Ur238 -Pb206 0.85238372 232 208 Th -Pb Y=no/nt = 0.874871391 820,000,000 1,030,000,000 2,700,000,000 P-D Th 232 -Pb208 Y=no/nt = 0.853479598 3,200,000,000 P-D Rb87-Sr87 Y=no/nt = 0.9501515238 3,600,000,000