User:DCDuring/Geology

Eras

 * Portlandian- (Portland Group (geology)) (GW) (See below.) (Tithonic ⇒ + (GW)  (See below.)
 * - (GW-) (See Bolonia (Spain))
 * - (GW-) (See Sequani.) (which also has other meanings) "upper Oxfordian", Upper Oxfordian/upper Oxfordian
 * - (GW-) (See Rauracian Republic.) ~Jura Mountains
 * - (GW) (See below.)
 * + (GW) (See below.)
 * + (GW) (See below.) (- (GW) (See Urgonian Limestone Formation (See below.))
 * + (GW) (See below.)
 * + (GW) (See below.)(+ (GW-) (See Purbeckian Group.)
 * - (GW-) (See Argovian Formation, Aargau.)
 * - (GW-) ⇒ (GW) ⇒ + (GW) (See below.)
 * + (GW) (See below.)
 * + (GW) (See below.)
 * (GW-) (See Bunter (geology) (See below.)
 * (GW)
 * - (GW) (See below.)
 * - (GW) (See Dogger (stratigraphy)) (See below.)
 * - (GW) (See below.)
 * - (GW-) (See Germanic Trias.)
 * + (GW) (See below.)/ - (GW) (See below.)
 * - (GW-) (See Capitanian, Saxothuringian Zone.)
 * - (GW-) (See below.)- (GW) (See Stephanian (stage).) (See below.)
 * + (GW) (See below.) (- (GW-)))
 * + (GW) (See below.)
 * + (GW) (See below.)
 * (GW-)
 * - (GW) (See Becraft Formation, Rhenohercynian Zone.)
 * - (GW-)
 * - (GW-) (See Ouargla Province.)
 * (GW) (See Cambrian.) (See below.)
 * - (GW) (See below.)
 * - (GW-) (Precambrian) (See below.)
 * + (GW)
 * (GW-) (See below.) (See Flandrian interglacial.)
 * (GW) (See Tyrrhenian (stage).) (See below.)
 * - (GW) (See below.)
 * + (GW-) (See below.)( (GW) (See Calabrian (stage))
 * (GW)
 * - (GW-) (See Piacenzian) (See below.)
 * - (GW-) (- (GW-) (See below.))
 * - (GW-) (See Vindobona.)
 * (GW) (See Aquitanian (stage)
 * - (GW) (See below.)
 * - (GW-) (See Sannois.)
 * - (GW-) (See below.)
 * (GW-)
 * ⇒ (GW)


 * GW: in Geowhen Database
 * GW-: NOT in Geowhen Database

=From WP=

Comparative terms in chronostratigraphy and geochronology
Segments of rock (strata) in chronostratigraphy 	Time spans in geochronology 	Notes to geochronological units
 * eonothem eon 4 total, half a billion years or more
 * erathem era 14 total, several hundred million years
 * system period - -
 * series epoch -	tens of millions of years
 * stage age - millions of years
 * chronozone chron - -