Ammonite Zonation - Boreal
18International timescale
Mesozoic
Cretaceous
Late Cretaceous
Early Cretaceous
Jurassic
Late Jurassic
Middle Jurassic
Early Jurassic
Triassic
Late Triassic
Middle Triassic
Early Triassic
Paleozoic
Permian
Lopingian
Ammonite Zonation - Boreal
Mantelliceras dixoni
Mantelliceras mantelli
Arrhaphoceras briacensis
Mortoniceras perinflatum
Mortoniceras rostratum
Mortoniceras fallax
Mortoniceras inflatum
Mortoniceras pricei
Diploceras cristatum
Euhoplites lautus
Euhoplites loricatus
Hoplites dentatus
Douvilleiceras mammillatum
Leymeriella schrammeni
Hypacanthoplites jacobi
Parahoplites nutfieldiensis
Epicheloniceras martinoides
Tropaeum bowerbanki
Deshayesites deshayesi
Deshayesites forbesi
Parancyloceras bidentatum/Parancyloceras scalare
Simanocyloceras stolleyi
Ancyloceras inexum/S. pingue
Paracrioceras denckmanni
Paracrioceras elegans
Haplocrioceras fissicostatum
Paracrioceras rarocinctum
Simbirskites variabilis
Simbirskites marginatus
Craspedodiscus gottschei
Milanowskia speetonensis
Speetoniceras inversum
Endemoceras regale
Endemoceras noricum
Endemoceras amblygonium
Eleniceras paucinodum
Stolcoceras tuberulatum
Dichotomites
Prodichotomites
Polyptychites
Paratollia/Platylenticeras
Peregrinoceras albidum
Surites stenomphalus
Surites icenii
Hectoroceras kochi
Runctonia runctoni
Subcraspedites lamplughi
Subcraspedites preplicomphalus
Subcraspedites primitivus
Paracraspedites oppressus
Titanites anguiformes
Galbanites kerberus
Galbanites okusensis
Glaucolithites glaucolithus
Progalbanites albani
Virgatopavlovia fittoni
Pavlovia rotunda
Pavlovia pallasioides
Pectinatites hudlestoni
Pectinatites wheatleyensis
Pectinatites scitulus
Pectinatites elegans
Aulacostephanus autissiodorensis
Aulacostephanus eudoxus
Aulacostephanus mutabilis
Rasenia cymodoce
Pictonia baylei
Ringsteadia pseudocordata
Perisphinctes cautisnigrae
Perisphinctes pumilus
Perisphinctes plicatilis
Cardioceras cordatum
Quenstedtoceras mariae
Quenstedtoceras lamberti
Peltoceras athleta
Erymnoceras coronatum
Kosmoceras jason
Sigloceras calloviense
Prolanulites koenigi
Macrocephalites herveyi
Clydoniceras discus
Oxycerites orbis
Procerites hodsoni
Morrisiceras morrisi
Tulites subcontractus
Procerites progracilis
Zigzagiceras zigzag
Parkinsonia parkinsoni
Garantiana garantiana
Strenoceras niortense
Stephanoceras humphriesianum
Witchellia laeviuscula
Hyperlioceras discites
Graphoceras concavum
Brasilia bradfordensis
Ludwigia murchisonae
Leioceras opalinum
Pleydellia aalensis
Dumortieria levesquei
Grammoceras thouarsense
Haugia variabilis
Hildoceras bifrons
Harpoceras falciferum
Dactylioceras tenuicostatum
Pleuroceras spinatum
Amaltheus margaritatus
Prodactylioceras davoei
Tragophylloceras ibex
Uptonia jamesoni
Echinoceras raricostatum
Oxynoticeras oxynotum
Asteroceras obtusum
Caenisites turneri
Arnioceras semicostatum
Arietites bucklandi
Schlotheimia angulata
Alsatites liasicus
Psiloceras planorbis
Choristoceras crickmayi
Chochloceras amoenum
Gnomohalorites cordilleranus
Mesohimavatites columbianus
Drepanites rutherfordi
Juvavites magnus
Malayites dawsoni
Stikinoceras kerri
Klamathites macrolobatus
Tropites welleri
Tropites dilleri
Sirenites nanseni
Austrotrachyceras obesum
Tachyceras desatoyense
Daxatina canadensis
Frankites sutherlandi
Macl. maclearni
Meginoceras meginae
Tuchodiceras poseidon
Eoprotrachyceras matutinum
Frechites chischa
Eogymnotoceras deleeni
Anagymnotoceras varium
Lenotropites caurus
Siberlingites mulleri
Olenikites pilaticus
Bajarunia eumphala
Anawasatchites tardus
Euflemingites romunderi
Hedenstroemia hedenstroemi
Vavilovites sverdrupi
Proptychites candidus
Proptychites rosenkrantzi strigatus
Ophiceras commune
upper Otoceras boreale
lower Otoceras boreale
Zone
Mantelliceras dixoniMantelliceras mantelliArrhaphoceras briacensisMortoniceras perinflatumMortoniceras rostratumMortoniceras fallaxMortoniceras inflatumMortoniceras priceiDiploceras cristatumEuhoplites lautusEuhoplites loricatusHoplites dentatusDouvilleiceras mammillatumLeymeriella schrammeniHypacanthoplites jacobiParahoplites nutfieldiensisEpicheloniceras martinoidesTropaeum bowerbankiDeshayesites deshayesiDeshayesites forbesiParancyloceras bidentatum/Parancyloceras scalareSimanocyloceras stolleyiAncyloceras inexum/S. pingueParacrioceras denckmanniParacrioceras elegansHaplocrioceras fissicostatumParacrioceras rarocinctumSimbirskites variabilisSimbirskites marginatusCraspedodiscus gottscheiMilanowskia speetonensisSpeetoniceras inversumEndemoceras regaleEndemoceras noricumEndemoceras amblygoniumEleniceras paucinodumStolcoceras tuberulatumDichotomitesProdichotomitesPolyptychitesParatollia/PlatylenticerasPeregrinoceras albidumSurites stenomphalusSurites iceniiHectoroceras kochiRunctonia runctoniSubcraspedites lamplughiSubcraspedites preplicomphalusSubcraspedites primitivusParacraspedites oppressusTitanites anguiformesGalbanites kerberusGalbanites okusensisGlaucolithites glaucolithusProgalbanites albaniVirgatopavlovia fittoniPavlovia rotundaPavlovia pallasioidesPectinatites hudlestoniPectinatites wheatleyensisPectinatites scitulusPectinatites elegansAulacostephanus autissiodorensisAulacostephanus eudoxusAulacostephanus mutabilisRasenia cymodocePictonia bayleiRingsteadia pseudocordataPerisphinctes cautisnigraePerisphinctes pumilusPerisphinctes plicatilisCardioceras cordatumQuenstedtoceras mariaeQuenstedtoceras lambertiPeltoceras athletaErymnoceras coronatumKosmoceras jasonSigloceras callovienseProlanulites koenigiMacrocephalites herveyiClydoniceras discusOxycerites orbisProcerites hodsoniMorrisiceras morrisiTulites subcontractusProcerites progracilisZigzagiceras zigzagParkinsonia parkinsoniGarantiana garantianaStrenoceras niortenseStephanoceras humphriesianumWitchellia laeviusculaHyperlioceras discitesGraphoceras concavumBrasilia bradfordensisLudwigia murchisonaeLeioceras opalinumPleydellia aalensisDumortieria levesqueiGrammoceras thouarsenseHaugia variabilisHildoceras bifronsHarpoceras falciferumDactylioceras tenuicostatumPleuroceras spinatumAmaltheus margaritatusProdactylioceras davoeiTragophylloceras ibexUptonia jamesoniEchinoceras raricostatumOxynoticeras oxynotumAsteroceras obtusumCaenisites turneriArnioceras semicostatumArietites bucklandiSchlotheimia angulataAlsatites liasicusPsiloceras planorbisChoristoceras crickmayiChochloceras amoenumGnomohalorites cordilleranusMesohimavatites columbianusDrepanites rutherfordiJuvavites magnusMalayites dawsoniStikinoceras kerriKlamathites macrolobatusTropites welleriTropites dilleriSirenites nanseniAustrotrachyceras obesumTachyceras desatoyenseDaxatina canadensisFrankites sutherlandiMacl. maclearniMeginoceras meginaeTuchodiceras poseidonEoprotrachyceras matutinumFrechites chischaEogymnotoceras deleeniAnagymnotoceras variumLenotropites caurusSiberlingites mulleriOlenikites pilaticusBajarunia eumphalaAnawasatchites tardusEuflemingites romunderiHedenstroemia hedenstroemiVavilovites sverdrupiProptychites candidusProptychites rosenkrantzi strigatusOphiceras communeupper Otoceras borealelower Otoceras boreale
