Researchers zero in on date of early hominids
...what made Erk-el-Ahmar difficult to date. "Carbon dating is good only back to about 50,000 years, and it de...rganic material," he pointed out. "Potassium-Argon dating can be used from about 10,000 years to more than a billion years, depending on the rock, but it requ...African bone tool discovery has important implications for evolution of human behavior
...age, making the bone tools somewhat older. Direct dating of these sterile yellow dune sediments and of burnt stone from the same layers as the bone tools using thermoluminescence methods is well advanced and the results are expected to be released shortly. According to Marean, bone tools have been seen as ...... Based on stored blood samples and medical records dating as far back as the late 1950s, the correlative study in this month's Archives of General Psychiatry is the first to compare direct laboratory evidence of specific maternal infections with the development of psychosis in children. "The evidence shows...Paradox of groundwater age has implications for hydrology
...lications in groundwater hydrology. Like carbon-14 dating of artifacts, scientists can use radioactive isotopes to age-date groundwater. If a sample proves to be very old, we might conclude that it has been migrating very slowly through the aquifer, Johnson said. However, the water may have migrated quick...Beware of leap year when predicting climate change, warns researcher
...Tanana River. After examining Ice Classic archives dating back 84 years, Sagarin concluded that, on average,...erated the advance of spring, others using records dating back two or three centuries underestimated its arrival. "All of the phenological studies I reviewed ...Rutgers helping Finns explore arctic microbes
...est Research Institute with forest ecology records dating back more than a century. "We thus have an excellent information resource on which to build using new methods for exploring microbial activities," noted Haggblom. Unlocking the secrets of the microbes' unique cold-loving biochemical processes thei...Antarctic mud reveals ancient evidence of global climate change
...the shells of microscopic creatures called diatoms dating back some 10,000 years to the beginning of the Holocene - the most recent geologic epoch. "The Antarctic Peninsula is an ideal region to investigate climate change at decadal to millennial time scales due to its location in one of the Earth`s most d...Counterintuitively, after extreme droughts, wading birds flourish
...stery using Everglades climate and nesting records dating back decades. They identified two spans of years, 1931-1946 and 1974-1998, when there were good records of consecutive years of nesting data. Within these periods, they identified eight severe droughts, when there was little or no water during the Ja...Centuries-old lotus seeds germinated by UCLA scientists
...geologic record as early as 135 million years ago, dating from a time when dinosaurs roamed the Earth, Shen-Miller said. In China, it has been grown for at least 4,000 years. Shen-Miller said she would share her remaining ancient lotus seeds with other interested biologists....UAF biologist tracking extinct bears published in Science
...e better understood with help from the radiocarbon dating of bone specimens found in nearly pristine condition preserved in Alaskas permafrost. Ancient DNA studies conducted on these specimens are the subject of an article in the March 21 issue of the journal, "Science" titled, "Dynamics of Pleistocene Popu...April GEOLOGY and GSA TODAY media highlights
...ombination of experimental petrology and 40Ar/39Ar dating of crystals from the tuff. The authors found that some crystals present in the magma do not crystallize experimentally from the magma at known temperatures and pressures. Those same crystals are also not in isotopic equilibrium with others that do ...Scientists push back primate origins from 65 million to 85 million years ago
.... "This view reflects the common procedure of dating the origin of a group according to the estimated stratigraphic age of the first fossil representative, and then adding a few million years," Dr. Martin explains. "This doesn't work well for primates because so few fossils have been found, many of the...DuPont to launch soybeans into space
... in July, has a long history of space initiatives, dating back to NASAs origination 33 years ago. For example, when Neil Armstrong walked on the moon in 1969, he wore 25 separate layers 23 of those layers were DuPont materials. In 1984, Pioneer corn seeds were on board a Challenger shuttle launch. The s...Science editor explores the role of environmental change on global security
... cores from Greenland and various sediment records dating back thousands of years. The data revealed that, in the recent past, the Earth experienced periods of extreme climate change during which average temperatures rose and fell as much as 10 degrees Celsius in a matter of decades. The last cold snap ende...DNA shows genetic variability of the nene lost more than 500 years ago, not during the 20th century
...00 years ago; and bones from paleontological sites dating from 500 to 2540 radiocarbon years before the pres... the precipitous drop much earlier, in the samples dating from between 500 and 850 years ago, coincident with the expansion of human settlements on the island...Study of fossils found in arctic shows plants more developed at earlier time
...el Hill scientist has discovered fossils of plants dating back some 420 million years. The discovery, made o...ls of scorpions, millipedes and related arthropods dating back almost 400 million years. Those creatures, which predated dinosaurs and other reptiles by some ...Frozen 'lake' beneath Antarctica ideal to test sterile drilling techniques
...ica and Europe, may be 10 or 20 million years old, dating from before the Antarctic continent was covered by a sheet of ice. Since any contamination introduced by drilling into the permafrost would not travel far, the site would make a good place to test such techniques in preparation for drilling into Lake...Rare childhood bone disorder linked to gene deletion in two Navajo patients
...o patients likely share a common ancestor, perhaps dating back a century. "In a way, this also is a sociology story," says Whyte. "Our findings appear to represent the emergence of a "founder effect" in this population that underwent a "bottleneck" constriction years ago. The Navajo Nation decreased from a...November GEOLOGY and GSA TODAY media highlights
...drill core data from Antarctica suggesting precise dating of the Oligocene-Miocene boundary; and new techniq...4.0 million years using an integration of multiple dating methods. This age provides an important new calibration point for the geological time scale. It is p...... DuPont has a rich tradition of space initiatives, dating to NASA's origination 33 years ago. For example, when Neil Armstrong walked on the moon in 1969, he wore 25 separate layers 23 of those layers were DuPont materials. In 1984, Pioneer corn seeds were on board a Challenger shuttle launch. The seeds...