ab urbe condita absolute dating achondrite adsorption air pollution amino acid dating anno domini anno mundi archaeology archaeomagnetic dating astronomical chronology astronomical year numbering astronomy basalt before present calendar cambridge university press canon of kings carbon carbon dioxide chemical element chinese era name chondrite chronicle chronology chronostratigraphy circa common era continental crust cosmic calendar cosmic ray crystal deep time dendrochronology earth egyptian chronology environmental isotopes ephemeris era escape velocity floruit fluid inclusions forensic science galactic year geochemistry geochronology geologic time scale geological history of earth geology glottochronology gregorian calendar groundwater half-life harzburgite helium hindu units of measurement history iso week date ice core incremental dating islamic calendar isochron dating isotopic signature japanese era name julian calendar korean era name law of superposition lead lichenometry limmu lithium lunar calendar lunisolar calendar magma metonic cycle milankovitch cycles molecular clock neodymium new chronology noble gas old style and new style dates optical dating ore genesis osmium paleomagnetism paleontology periodization proleptic gregorian calendar proleptic julian calendar protactinium radioactive decay radiocarbon dating radiogenic radiometric dating regnal year relative dating revised julian calendar rhenium roman calendar samarium samarium-neodymium dating seleucid era sexagenary cycle solar calendar sothic cycle southern ocean spallation spanish era stable isotope subduction sulfide synchronoptic view tephrochronology thermohaline circulation thermoluminescence dating thorium time timeline tritium university of ottawa uranium uranium-lead dating volatiles volcano water year zero