0 TimeScale Creator 2012 chart Calca reous Marine Macrofossils Nann Standard Chronostratigraphy Geomagnetic (Mesozoic-Paleozoic) ofossil Polarity Tethyan Ammonoids s Ma Period Epoch Age/Stage Substage M17 CC2 Cretaceous Early Berriasian E M18 CC1 145 Berriasella jacobi M19 NJT1 M20 7b 146 Lt M21 Durangites NJT1 M22 7a 147 M22A Micracanthoceras microcanthum NJT1 M23 6b 148 Micracanthoceras ponti / M24 Burckhardticeras peroni NJT1 Tithonian M24A 6a 149 M24B Semiformiceras fallauxi NJT15 M25 b E 150 M25A Semiformiceras semiforme NJT1 M26 Semiformiceras darwini 5a 151 lt-Oxf N M-Sequence Hybonoticeras hybonotum 152 lt-Oxf R Hybonoticeras beckeri 153 m- Lt Oxf N Aulacostephanus eudoxus 154 m- NJT14 Late Aspidoceras acanthicum Oxf R Kimmeridgian Crussoliceras divisum 155 Card- N Ataxioceras hypselocyclum 156 E e-Oxf Sutneria platynota R Idoceras planula 157 Cal- Oxf N Epipeltoceras bimammatum 158 lt- Lt Callo v R NJT13 159 Perisphinctes bifurcatus lt- Gregoryceras transversarium b Callo Perisphinctes plicatilis 160 v R Oxfordian M Cardioceras cordatum lt- 161 Quenstedtoceras mariae Callo Quenstedtoceras lamberti v N Oxfordian composite Peltocoeras athleta 162 m- NJT13 E Erymnoceras coronatum Callo a Reineckeia anceps 163 v R e- Macrocephalites gracilis Lt Bullatimorphites bullatus 164 Callo M v N Clydoniceras discus Callovian Hecticoceras retrocostatum 165 Bat- NJT12 E Cal R Cadomites bremeri Morrisiceras morrisi 166 lt- Lt Bath Tulites subcontractus N Procerites progracilis 167 M Bathonian m- England-Burgundy-Swabia Procerites aurigerus NJT11 Bath Zigzagiceras zigzag 168 E R Parkinsonia parkinsoni NJT1 e- Garantiana garantiana 0b 169 Middle Lt Bath Strenoceras niortense Bajocian s. Spain NJT1 N Stephanoceras 0a 170 E Baj- humphriesianum NJT9 Lt Bat R Sonninia propinquans NJT8 171 lt- Witchellia laeviuscula c M Bajo Hyperlioceras discites 172 N Aalenian Graphoceras concavum m- Brasilia bradfordensis NJT8b Bajo S. Switz. 173 Jurassic E Ludwigia murchisonae R Leioceras opalinum e- NJT8 174 Pleydellia aalensis Bajo a Dumortieria pseudoradiosa N 175 Phlyseogrammoceras lt-Aal dispansum R 176 Lt Grammoceras thouarsense m-Aal NJT7b N 177 mid- Haugia variabilis Aal R 178 Toar- Toarcian Aal N 179 Toar- Hildoceras bifrons NJT7a Aal N 180 m- Toarcian composite E Toar 181 R Harpoceras serpentinum NJT6 e- Toar 182 Dactylioceras tenuicostatum NJ5b N 183 Pl- Emaciaticeras emaciatum Toar s. Spain R 184 NJT5a lt- Arieticeras algovianum 185 Plien s. Switz. Lt (Domerian) N m- 186 Plien Fuciniceras lavinianum Pliensbachian R 187 m- NJT4b Early Plien 188 R Prodactylioceras davoei e- Paris Basin and Switz. Tragophylloceras ibex 189 E (Carixian) Plien N NJT4a 190 e- Uptonia jamesoni Plien 191 R Si-Pl NJT3b 192 N Echioceras raricostatum Si-Pl N 193 Lt (Lotharingian) lt-Sin Oxynoticeras oxynotum R 194 lt-Sin N Paris Basin core (generalized) Asteroceras obtusum 195 Sinemurian NJT3a Caenisites turneri 196 m-Sin R 197 Arnioceras semicostatum E 198 e-Sin mixe NJT2b d Arietites bucklandi 199 Newark and Hartford series NJT2 Schlotheimia angulata a 200 Hett-N Alsatites liasicus Hettangian NJT1 Psiloceras planorbis 201 Psiloceras spelae Triassic Late Rhaetian NT2b E23 Newark series Choristoceras marshi.