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Quaternary period
(Encyclopedia) Quaternary periodQuaternary periodkwətûrˈnərē [key], younger of the two geologic periods of the Cenozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table)…sidereal period
(Encyclopedia) sidereal period, in astronomy, length of time a body takes to complete an orbit relative to the fixed stars. See sidereal time.Silurian period
(Encyclopedia) Silurian periodSilurian periodsĭl&oobreve;rˈēən, sī– [key] [from the Silures, ancient tribe of S Wales, where the period was first studied; named by the British geologist R. I.…Ordovician period
(Encyclopedia) Ordovician periodOrdovician periodôrdəvĭshˈən [key] [from the Ordovices, ancient tribe of N Wales], second period of the Paleozoic era of geologic time (see Geologic Timescale,…Paleolithic period
(Encyclopedia) Paleolithic periodPaleolithic periodpāˌlēəlĭthˈĭk, –lēō–, pălˌ– [key] or Old Stone Age, the earliest period of human development and the longest phase of mankind's history. It is…Pennsylvanian period
(Encyclopedia) Pennsylvanian period: see Carboniferous period.Tertiary period
(Encyclopedia) Tertiary periodTertiary periodtûrˈshēĕrˌē [key], name for the major portion of the Cenozoic era, the most recent of the geologic eras (see Geologic Timescale, tablegeologic timescale,…Cambrian period
(Encyclopedia) Cambrian period [Lat. Cambria=Wales], first period of the Paleozoic geologic era (see Geologic Timescale, tablegeologic timescale, table) extending from approximately 570 to 505…Carboniferous period
(Encyclopedia) Carboniferous periodCarboniferous periodkärbənĭfˈərəs [key], fifth period of the Paleozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table), from 350 to…synodic period
(Encyclopedia) synodic periodsynodic periodsĭnŏdˈĭk [key], in astronomy, length of time during which a body in the solar system makes one orbit of the sun relative to the earth, i.e., returns to the…Trending
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