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Lucas is a city in Collin County, Texas, United States. As of the 2010 census the population was 5,166, up from 2,890 at the 2000 census.
Geochronology is the science of determining the age of rocks, fossils, and sediments using signatures inherent in the rocks themselves. Absolute geochronology can be accomplished through radioactive isotopes, whereas relative geochronology is provided by tools such as palaeomagnetism and stable isotope ratios. By combining multiple geochronological indicators the precision of the recovered age can be improved.
High School 1327, formerly known as Sir Francis Drake High School is a secondary school located in San Anselmo, California. It was named after the English naval officer Sir Francis Drake, who purportedly landed in the area in 1579. The school's mascot is a pirate named Petey.
Argon–argondating is a radiometric dating method invented to supersede potassium-argon (K/Ar) dating in accuracy. The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of argon isotopes. 40Ar/39Ar dating relies on neutron irradiation from a nuclear reactor to convert a stable form of potassium (39[K) into the radioactive 39Ar. As long as a standard of known age is co-irradiated with unknown samples, it is possible to use a single measurement of argon isotopes to calculate the 40K/40Ar* ratio, and thus to calculate the age of the unknown sample. 40Ar* refers to the radiogenic 40Ar, i.e. the 40Ar produced from radioactive decay of 40K. 40Ar* does not include atmospheric argon adsorbed to the surface or inherited through diffusion and its calculated value is derived from measuring the 36Ar and assuming that 40Ar is found in a constant ratio to 36Ar in atmospheric gases.
Mark George Yudof is an American law professor and academic administrator. He is a former president of the University of California (2008-2013), former chancellor of the University of Texas System (2002–2008), and former president of the University of Minnesota (1997–2002).
Carrizozo volcanic field is a monogenetic volcanic field located in New Mexico, US. The volcanic field consists of two lava flows, the Broken Back flow and the Carrizozo lava flow, the second youngest in New Mexico. Both lava flows originated from groups of cinder cones. The Broken Back flow is approximately 16 kilometres (10 mi) long and the Carrizozo, one of the largest in the world, is 68 kilometres (42 mi) long, covering 328 square kilometres (127 sq mi) with a volume of 4.2 cubic kilometres (1.0 cu mi).
The Cretaceous–Paleogene (K–Pg) boundary, formerly known as the Cretaceous–Tertiary (K-T) boundary, is a geological signature, usually a thin band of rock. The K–Pg boundary marks the end of the Cretaceous Period, the last period of the Mesozoic Era, and marks the beginning of the Paleogene Period, the first period of the Cenozoic Era. Its age is usually estimated at around 66 Ma, with radiometric dating yielding a more precise age of 66.043 ± 0.011 Ma.
Miño Volcano is a symmetrical cone-shaped stratovolcano located in El Loa Province, Antofagasta Region, Chile. It lies a few kilometres northwest of Aucanquilcha volcano and at its foot originates Loa River. The major settlement in its vicinity is Ollagüe. The volcano has erupted mafic andesite. Potassium-argon dating has yielded ages of 3.59±0.11 and 3.27±0.40 million years ago for Miño. This volcano is usually considered part of Aucanquilcha, and lava flows appear to originate from the summit.
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The Berkeley Geochronology Center (BGC) is a non-profit geochronology research institute in Berkeley, California. It was originally a research group in the laboratory of University of California Berkeley geophysicist and geochronologist Garniss Curtis, now professor emeritus. The group is now an independent scientific research institute directed by the geologist and geochronologist Paul Renne, Professor in Residence in the Department of Earth & Planetary Science at UC Berkeley.
Garniss H. Curtis, was a professor of geology at the University of California, Berkeley, geochronologist, volcanologist, geophysicist, and founder of the Berkeley Geochronology Center. In 1960, Curtis and fellow UC Berkeley geophysicist Jack Evernden used potassium-argon dating methods developed by UC Berkeley physicist John Reynolds on minerals found in tephra deposits collected by Evernden to date Mary Leakey's 1959 Olduvai Gorge Bed I hominin Zinjanthropus to 1.89 to 1.57 Mya. The great age of the fossil hominid and associated stone tools in the bed pushed back the then accepted age of the Pleistocene another million years, causing a stir in the geology community. The dating of these fossil finds is considered a starting point for the collaboration of paleoanthropology and geochronology.
Pilot Rock is a prominent volcanic plug located in the western Cascade Range near the east end of the Siskiyou Mountains, just east of the Siskiyou Summit near Ashland, Oregon. Rising thousands of feet above the Shasta and Rogue valleys, it is a landmark distinguishable from over 40 miles (64 km) away. At 25.6 million years old, it is one of the oldest formations of the Cascade Range. The rock is protected by the Cascade–Siskiyou National Monument and the Soda Mountain Wilderness. Several trails pass near Pilot Rock, including the Pacific Crest Trail.
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Penelope J. Boston is a speleologist. She is associate director of the National Cave and Karst Research Institute in Carlsbad, New Mexico, and founder and director of the Cave and Karst Studies Program at New Mexico Institute of Mining and Technology in Socorro. Among her research interests are geomicrobiology of caves and mines, extraterrestrial speleogenesis, and space exploration and astrobiology generally.
Ryan Gabrielson is an American investigative journalist. He won a George Polk Award, and Pulitzer Prize for Local Reporting.
Donald James DePaolo is an American professor of geochemistry in the Department of Earth and Planetary Science at the University of California, Berkeley and Associate Laboratory Director for Energy and Environmental Sciences at the Lawrence Berkeley National Laboratory.
Elena Aprile is an Italian-American experimental particle physicist. She has been a professor of physics at Columbia University since 1986. She is the founder and spokesperson of the XENON Dark Matter Experiment. Aprile is well known for her work with noble liquid detectors and for her contributions to particle astrophysics in the search for dark matter.
Kunchithapadam Gopalan is an Indian geochronologist and an emeritus scientist at National Geophysical Research Institute. He is known for his studies on the chronologies of critical rock suites of the Indian subcontinent and is an elected fellow of the Indian Academy of Sciences, Indian National Science Academy, Indian Geophysical Union and the National Academy of Sciences, India. The Council of Scientific and Industrial Research, the apex agency of the Government of India for scientific research, awarded him the Shanti Swarup Bhatnagar Prize for Science and Technology, one of the highest Indian science awards for his contributions to earth, atmosphere, ocean and planetary sciences in 1982.
References
- 1 2 Berkeley Geochronology Center. "Paul R. Renne" . Retrieved 2009-02-08.CS1 maint: discouraged parameter (link)
- ↑ Ludwig, Kenneth R.; Paul R. Renne (2000). "Geochronology on the paleoanthropological time scale". Evolutionary Anthropology: Issues, News, and Reviews. 9 (2): 101–110. doi:10.1002/(SICI)1520-6505(2000)9:2<101::AID-EVAN4>3.0.CO;2-W.
- ↑ Farley, Kenneth A. (December 2005). "Renne Receives 2005 N. L. Bowen Award". Archived from the original on October 11, 2008. Retrieved 2009-02-08.CS1 maint: discouraged parameter (link)
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