| Stage | Age (Ma) GTS 2020 | GSSP Location | Latitude, Longitude | Boundary Level | Correlation Events |  | Status | Reference | 
            
                
          | Quaternary System | 
        
          | Holocene Series | 
        
           | Meghalayan Stage | 0.00425 | Mawmluh Cave, Meghalaya,India | 25.2622°N 91.7150°E | Mawmluh Cave speleothem dated at 4250yr bk2 (before AD2000) | Stable isotope profile shows a shift to heavier isotopic values, |   | Ratified 2018 | Episodes  41/4, 2018 | 
        
           | Northgrippian Stage | 0.008236 | borehole NGRIP1 in the central Greenland ice sheet | 75.1000°N 42.3200°W | 1228.67 m depth in NGRIP 1 ice core | Climatic cooling following a period of generally rising temperatures 
during the 
Early Holocene |   | Ratified 2018 | Episodes  41/4, 2018 | 
        
           | Greenlandian Stage | 0.0118 | NorthGRIP ice core, central Greenland | 75.1000°N 42.3200°W | 1492.45m depth in Borehole NGRIP2 | Climatic -- End of the Younger Dryas cold spell, which is   reflected
in a shift in deuterium excess values |   | Ratified 2008 | Episodes 31/2, 2008; J. Quaternary Sci., Vol. 24 pp. 3-17, 2009; Episodes  41/4, 2018 | 
        
          | Pleistocene Series | 
        
           | Upper Pleistocene Stage | 0.126 | Taranto, Italy | 0.0000°N 0.0000°E | 63.5 m below surface | Climatic -- Base of the Eemian interglacial stage (= base of marine
isotope stage 5e) before final glacial episode of Pleistocene. |  |  | Episodes 31/2, 2008 | 
        
           | Chibanian | 0.78 | Chiba, Japan |  | Base of Byk-E tephra bed | Byk-E tephra; 1.1 m below directional midpoint of Brunhes–Matuyama 
magnetic 
reversal (base of Chron 1n) |   | Ratified 2019 |  | 
        
           | Calabrian Stage | 1.8 | Vrica, Italy | 39.0385°N 17.1348°E | base of the marine claystone overlying the sapropelic marker Bed
'e' (Mediterranean Precession Related Sapropel, MPRS 176) | top of Olduvai magnetic subchron is about 8 m above the GSSP |   | Ratified 1985 | Episodes 8/2, p. 116 - 120, 1985; Episodes 35/3, p. 388 - 397, 2012 | 
        
           | Gelasian Stage | 2.58 | Monte San Nicola, Sicily, Italy | 37.1469°N 14.2035°E | base of marly layer overlying sapropel MPRS 250 | Magnetic -- Matuyama/Gauss boundary (C2r/C2An) is 1m below GSSP. GSSP
level is within Marine Isotope Stage 103. |   | Definition as base of Quaternary and Pleistocene ratified 2009 | Episodes 21/2, p. 82-87, 1998 | 
            
                
          | Neogene System | 
        
          | Pliocene Series | 
        
           | Piacenzian Stage | 3.6 | Punta Piccola, Sicily, Italy | 37.2889°N 13.4933°E | base of the beige marl bed of small-scale carbonate cycle 77 (MPRS
347) | Magnetic -- Gauss/Gilbert (C2An/C2Ar) magnetic reversal is recorded
immediately above the GSSP |   | Ratified 1997 | Episodes 21/2, p. 88-93, 1998 | 
        
           | Zanclean Stage | 5.333 | Eraclea Minoa, Sicily, Italy | 37.3917°N 13.2806°E | base of the Trubi Formation which corresponds to Insolation cycle 510 | Magnetic -- base of the Thvera magnetic event (C3n.4n) is
only 96 kyr (5 precession cycles) younger than the GSSP. |   | Ratified 2000 | Episodes 23/3, p. 179 - 187, 2000 | 
        
          | Miocene Series | 
        
           | Messinian Stage | 7.25 | Oued Akrech, Morocco | 33.9369°N 6.8125°W | reddish layer of sedimentary cycle number 15 | Planktonic foraminifer first regular occurrence of  Globorotalia
miotumida, and calcareous nannofossil FAD 
Amaurolithus delicatus |   | Ratified 2000 | Episodes 23/3, p. 172 - 178, 2000 | 
        
           | Tortonian Stage | 11.63 | Monte dei Corvi Beach, near Ancona, Italy | 43.5867°N 13.5694°E | mid-point of sapropel layer of basic cycle number 76. | Calcareous   nannofossil last common occurrence of Discoaster
kugleri |   | Ratified 2003 | Episodes 28/1, p. 6 - 17,  2005 | 
        
           | Serravallian Stage | 13.82 | Ras il Pellegrin section, Fomm Ir-Rih Bay, west   coast of Malta | 35.9139°N 14.3361°E | formation boundary between the Globigerina Limestone and Blue Clay
Formation | Oxygen-isotopic event (global cooling episode) Mi3b; near calcareous
nannofossil LAD ofSphenolithus heteromorphus |   | Ratified 2007 | Episodes, 32/3, 152 - 166, 2009 | 
        
           | Langhian Stage | 15.99 | St. Peter's Pool, Malta or La Vedova,Italy |  |  | Base of magnetic polarity chron C5Br |  |  |  | 
        
           | Burdigalian Stage | 20.45 | Potentially in astronomically-tuned ODP core |  |  | Near FAD of  calcareous nannofossil Helicosphaera ampliaperta |  |  |  | 
        
           | Aquitanian Stage | 23.04 | Lemme-Carrioso Section, Allessandria Province, Italy | 44.6589°N 8.8364°E | 35m from the top of the section | Magnetic -- base of Chron C6Cn.2n; planktonic
foraminifer FAD of Paragloborotalia kugleri; 
calcareous nannofossil near LAD Reticulofenestra bisecta (base
Zone  NN1); Oxygen isotopic event Mi-1. |   | Ratified 1996 | Episodes 20/1, p. 23 - 28, 1997 | 
            
                
          | Paleogene System | 
        
          | Oligocene Series | 
        
           | Chattian Stage | 27.3 | Monte Cagnero, Umbria-Marche region, Italy | 43.6466°N 12.4677°E | at meter level 197 | HCO  (highest common occurrence) of planktonic foraminifer
Chiloguembelina cubensis |   | Ratified 2016 | Episodes 41/1, p. 17-32, 2018 | 
        
           | Rupelian Stage | 33.9 | Massignano, near Ancona, Italy | 43.5328°N 13.6011°E | base of a 0.5m thick greenish-grey marl bed 19m   above base of section | Foraminifer LAD Hantkenina and Cribrohantkenina |   | Ratified 1992 | Episodes 16/3, p.379 - 382, 1993 | 
        
          | Eocene Series | 
        
           | Priabonian Stage | 37.7 | Alano di Piave section, NE Italy | 45.9142°N 11.9180°E | Tiziano Bed at 63.57m | Foraminifer LAD of Morozovelloides, Calcareous nannofossil acme 
of 
Cribrocentrum erbae |   | Ratified 2020 | Episodes 44/2, p.151-173, 2021 | 
        
           | Bartonian Stage | 41 | Contessa highway section near Gubio, Central   Apennines, Italy |  |  | provisional: base of magnetic polarity chronozone C18r |  |  |  | 
        
           | Lutetian Stage | 48.1 | Gorrondatxe sea-cliff section,Basque Country, northern Spain | 43.3796°N 3.0143°W | at 167.85 metres in the Gorrondatxe section at a dark marly level | Calcareous nannofossil FAD of Blackites inflatus |   | Ratified 2011 | Episodes 34/2, p. 86 - 108 2011 | 
        
           | Ypresian Stage | 56 | Dababiya, near Luxor, Egypt | 25.5000°N 32.5311°E | base of Bed 1 in DBH subsection | Carbon Isotope Excursion base, initiation of basal Eocene Thermal
maximum ("PETM") |   | Ratified 2003 | Micropaleontology 49/1, p.41 - 59, 2003; Episodes 30/4, p. 271 - 286, 2007 | 
        
          | Paleocene Series | 
        
           | Thanetian Stage | 59.2 | Zumaia section, northern Spain | 43.2996°N 2.2609°W | About 78 m above the Cretaceous/ Paleogene boundary; 6.5m above the
base of Member B of the Itzurun Formation | Magnetic -- Base of Chron C26n |   | Ratified 2008 | Episodes 34/4,p. 220-243, 2011 | 
        
           | Selandian Stage | 61.7 | Zumaia   section, northern Spain | 43.2992°N 2.2610°W | base of the red marls of Itzurun Formation | Onset of a carbon isotope shift and sea-level drop, 30 precession
cycles (~630 kyr) above the top of magnetic polarity Chron 27n |   | Ratified 2008 | Episodes 34/4,p. 220-243, 2011 | 
        
           | Danian Stage | 66 | Oued Djerfane, west of El Kef, Tunisia | 36.1537°N 8.6486°E | reddish layer at the base of the 50cm thick, dark   boundary clay | Iridium geochemical anomaly. Associated with a major   extinction
horizon (dinosaurs, ammonites, foraminifers, etc.) |   | Ratified 1991 | Episodes 29/4, p. 263 - 278, 2006 |