To constrain the timing of magma emplacement and eruption of volcanic rocks at Mt. Halla, Jeju Island, South Korea, a range of dating techniques (U-Pb, U-Th disequilibrium, and (U-Th)/He dating of zircon, and 40Ar/39Ar dating of groundmass) were applied to one trachyandesite sample ...
Paleontologists routinely sample anoxic sediments because untouched layers of sediments allow dating of layers by radiometric methods. Biologists often make surveys, e.g., along coasts, and interpret differences in cyst occurrences as differences in production or accumulation, not as differences in ...