Taxobox image Squalicorax and Ptychodus.jpg image caption Ptychodus janewayii teeth bottom row from Cope 1874 fossil range fossilrange 99.6 61.7 small Cretaceous to Paleogene small regnum Animal ia phylum Chordata classis Chondrichthyes subclassis Elasmobranchii superordo Selachimorpha ordo Hybodontiformes superfamilia Hybodontoidea familia Ptychodontidae genus authority subdivision ranks Genera subdivision Ptychodus Portal box Sharks Palaeontology Ptychodontidae is a Family biology family of extinct Hybodontiformes hybodontiform shark s which lived from the Cretaceous to the Paleogene . ref name PBDB http www.paleodb.org cgi bin bridge.pl?action checkTaxonInfo&taxon no 124928&is real user 1 The paleobioloy Database Ptychodontidae entry accessed on 8 23 09 ref References Reflist Category Cartilaginous fish Category Prehistoric fish Category Cretaceous fish Paleo fish stub ... more details
Use dmy dates date September 2011 Paleogene The Bartonian is, in the International Commission on Stratigraphy ICS s geological timescale , a stage stratigraphy stage or age geology age in the middle Eocene epoch geology epoch or series stratigraphy series . The Bartonian age spans the time between val 40.4 0.2 and val 37.2 0.2 ul Ma . It is preceded by the Lutetian and is followed by the Priabonian age. ref Gradstein et al. 2004 ref Stratigraphic definition The Bartonian stage was introduced by Switzerland Swiss stratigrapher Karl Mayer Eymar in 1857. The name derives from the coastal village Barton on Sea part of New Milton in southern England. The Barton Group , a lithostratigraphy lithostratigraphic unit from the south English Hampshire Basin , is of Bartonian age. The distinction between group stratigraphy group and stage was made in the second part of the 20th century, when stratigraphers saw the need to distinguish between litho and chronostratigraphy . The base of the Bartonian is at the first appearance of the calcareous nannoplankton species Reticulofenestra Reticulofenestra reticulata . In 2009, an official reference profile GSSP for the base of the Bartonian had not yet been established. The top of the Bartonian stage the base of the Priabonian is at the first appearance of calcareous nannoplankton species Chiasmolithus Chiasmolithus oamaruensis which forms the base of nannoplankton biozone NP18 . The Bartonian stage overlaps part of the upper Robiacian European Land Mammal Mega Zone it spans the Mammal Paleogene zones Mammal Paleogene zone 16 ref name MP cite web last Alroy first John page The Paleobiology Database title Mammal Paleogene zones url http paleodb.org ... Database Bartonian http stratigraphy.science.purdue.edu charts Timeslices 2 Paleogene.pdf Paleogene ... timescale Fig19.1 Pal bio colA.pdf Stratigraphic chart of the Paleogene , at the website of Norges Network of offshore records of geology and stratigraphy Paleogene Footer Geological history ... more details
Paleogene The Rupelian is, in the geologic timescale , the older of two age geology ages or the lower of two stage stratigraphy stages of the Oligocene epoch geology epoch series stratigraphy series . It spans the time between val 33.9 0.1 and val 28.4 0.1 ul Ma . It is preceded by the Priabonian stage part of the Eocene and is followed by the Chattian stage. ref Gradstein et al. 2004 ref Name The stage is named after the small river Rupel in Belgium , a tributary to the Scheldt . The Belgian Rupel Group derives its name from the same source. The name Rupelian was introduced in scientific literature by Belgian geologist Andr Hubert Dumont in 1850. The separation between the group stratigraphy group and the stage was made in the second half of the 20th century, when stratigraphers saw the need to distinguish between lithostratigraphy lithostratigraphic and chronostratigraphy chronostratigraphic names. Stratigraphic definition The base of the Rupelian stage which is also the base of the Oligocene series is at the extinction of foram genus Hantkenina . An official GSSP had not yet been assigned to the Rupelian in 2009. The top of the Rupelian stage the base of the Chattian is at the extinction of the foram genus Chiloguembelina which is also the base of foram biozone P21b . The Rupelian overlaps the Orellan , Whitneyan and lower Arikareean North American Land Mammal Ages , the upper ... Arvernian European Land Mammal Mega Zone s the Rupelian spans the Mammal Paleogene zones 21 ... title Mammal Paleogene zones url http paleodb.org cgi bin bridge.pl?action processViewScale&scale no 125 ... charts Timeslices 1 Neogene.pdf Neogene timescale including the upper Paleogene and http stratigraphy.science.purdue.edu charts Timeslices 2 Paleogene.pdf Paleogene timescale , at the website of the subcommission ... colA.pdf Stratigraphic chart of the Paleogene , at the website of Norges Network of offshore records of geology and stratigraphy Paleogene Footer Geological history p c Category Oligocene 1 ast Rupelianu ... more details
Italic title Taxobox name Eopululo wigmorei fossil range fossil range Late Eocene Recent image regnum Animal ia phylum Chordata ordo Rodent ia infraordo Hystricognathi familia Erethizontidae genus Eopululo species E. wigmorei binomial Eopululo wigmorei binomial authority Eopululo is the oldest known genus of New World porcupine s Erethizontidae . It is known only from the possibly late Eocene Santa Rosa local fauna of eastern Peru. There is only one species in the genus, Eopululo wigmorei . It was described in 2004 ref Frailey, C.D., and Campbell, K.E. 2004. Paleogene Rodents from Amazonian Peru The Santa Rosa Local Fauna. In The Paleogene Mammalian Fauna of Santa Rosa, Amazonian Peru. Natural History Museum of Los Angeles County, Science Series, 40 71 130. ref , and it is a member of one the oldest rodent faunas known from South America. ref http www.nhm.org site sites default files pdf contrib science SS 40.pdf The Paleogene Mammalian Fauna of Santa Rosa, Amazonian Peru ref References references Category Erethizontidae rodent stub ... more details
The Gashatan is an Asian Land Mammal Age , a large biozone which corresponds to ages between 58.7 55.8 Mya unit Ma for finds of fossil mammal s in Asia . This zone lies within the Thanetian stage stratigraphy stage of the Paleocene series stratigraphy series . It precedes the Bumbanian . ref http paleodb.org cgi bin bridge.pl?action displayInterval&interval no 1007 Paleo Database Gashatan ref reflist Category Paleocene Paleogene Footer geochronology stub ... more details
The Bumbanian is an Asian Land Mammal Age ALMA , a large biozone which corresponds to ages between 55.8 46.8 Mya unit Ma for finds of fossil mammal s in Asia . This zone lies within the Ypresian stage stratigraphy stage of the Eocene series stratigraphy series . It follows the Gashatan ALMA and precedes the Arshantan ALMA. ref http paleodb.org cgi bin bridge.pl?action displayInterval&interval no 1006 Paleo Database Bumbanian ref reflist Category Eocene Paleogene Footer geochronology stub ... more details
Paleogene The Danian is the oldest age geology age or lowermost stage stratigraphy stage of the Paleocene epoch geology epoch or series stratigraphy series , the Paleogene period geology period or system stratigraphy system and the Cenozoic era or erathem . The beginning of the Danian age and the end of the precessing Maastrichtian age is at the Cretaceous Paleogene extinction event val 65.5 0.3 ul Ma . The age ended val 61.7 0.2 u Ma , being followed by the Selandian age. ref See Gradstein et al. 2004 for the official geologic timescale ref Stratigraphic definitions The Danian was introduced in scientific literature by Germany German Switzerland Swiss geologist Pierre Jean douard Desor in 1847. It is named after the Latin name for Denmark . The Montian stage from Belgium Belgian stratigraphy named after the city of Mons is now considered a junior synonym and is no longer in use. The base of the Danian is defined at the iridium anomaly which characterized the K T boundary Cretaceous Paleogene boundary in stratigraphic sections worldwide. A section in El Kef , Tunisia was appointed as a reference profile GSSP for this important boundary. ref The GSSP for the Danian stage was established by Molina et al. 2006 ref The Danian is the oldest age of the Paleocene, defined at its base by the K ... of the Paleogene is the Globigerina eugubina, which is used to define the base of the Danian ... ages . It includes the oldest Mammal Paleogene zones , all included in the 1 5 group. ref name MP cite web last Alroy first John page The Paleobiology Database title Mammal Paleogene zones url http ..., Paleogene, Tertiary , Cenozoic at El Kef, Tunisia original definition and revision , Episodes ... charts Timeslices 2 Paleogene.pdf Paleogene timescale , at the website of the subcommission for stratigraphic ... chart of the Paleogene , at the website of Norges Network of offshore records of geology and stratigraphy Paleogene Footer Geological history p c Category Paleocene geochronology stub ast Danianu ... more details
The Thulean Plateau also known as the Thulean Province , was a great basalt ic lava plain that existed during the Paleogene Period, ref http www3.interscience.wiley.com cgi bin abstract 61005289 ABSTRACT Brittle tectonism in relation to the Palaeogene evolution of the Thulean NE Atlantic domain a study in Ulster Retrieved on 2007 11 10 ref which possibly extended over 1,800,000 km sup 2 sup 700,000 sq mi in the northern Atlantic Ocean region. The plateau was broken up during the formation of the Atlantic Ocean leaving remnants existing in Northern Ireland , bits of northwestern Scotland , the Faroe Islands , bits of northwestern Iceland , eastern Greenland and western Norway . It is the origin of the Giant s Causeway and Fingal s Cave . References reflist Category Oceanic plateaus Category Volcanic plateaus Category Paleogene volcanism Category Geology of Greenland Category Geology of the United Kingdom Category Geology of Norway Category Environment of Iceland regional geology stub he ... more details
Paleogene The Lutetian is, in the geologic timescale , a stage stratigraphy stage or age geology age in the Eocene . It spans the time between val 48.6 0.2 and val 40.4 0.2 ul Ma . The Lutetian is preceded by the Ypresian and is followed by the Bartonian . ref Gradstein et al. 2004 ref Together with the Bartonian it is sometimes referred to as the Middle Eocene subepoch. Less often, the Middle Eocene is not used and the Lutetian is united with the Ypresian in the Early Eocene. Stratigraphic definition The Lutetian was named after Lutetia , the Latin language Latin name for the city of Paris . The Lutetian stage was introduced in scientific literature by French geologist Albert de Lapparent in 1883. The base of the Lutetian stage is at the first appearance of the foram genus Hantkenina . An official reference profile GSSP for the base of the Lutetian had in 2009 not yet been established. Two candidates are located in Spain . ref See the http wzar.unizar.es perso emolina ypresian.html potential website of Eustoquio Molina for these candidates ref The top of the Lutetian the base of the Bartonian is at the first appearance of calcareous nannoplankton species Reticulofenestra Reticulofenestra reticulata . The Lutetian overlaps with the Geiseltalian and lower Robiacian European Land Mammal Mega Zone s The Lutetian stage spans the Mammal Paleogene zones 11 through 15. ref name MP cite web last Alroy first John page The Paleobiology Database title Mammal Paleogene zones url http paleodb.org cgi bin bridge.pl?action processViewScale&scale no 125 accessdate 15 July 2009 ref , the upper Bridgerian and Uintan North American Land Mammal Ages , the upper Arshantan and Irdinmanhan Asian ... 2 Paleogene.pdf Paleogene timescale , at the website of the subcommission for stratigraphic information of the ICS http norges.uio.no timescale Fig19.1 Pal bio colA.pdf Stratigraphic chart of the Paleogene , at the website of Norges Network of offshore records of geology and stratigraphy Paleogene ... more details
Paleogene The Priabonian is, in the International Commission on Stratigraphy ICS s geologic timescale , the latest age geology age or the upper stage stratigraphy stage of the Eocene epoch geology epoch or series stratigraphy series . It spans the time between val 37.2 0.1 and val 33.9 0.1 ul Ma . The Priabonian is preceded by the Bartonian and is followed by the Rupelian , the lowest stage of the Oligocene . ref Gradstein et al. 2004 ref Stratigraphic definition The Priabonian stage was introduced in scientific literature by Ernest Munier Chalmas and Albert de Lapparent in 1893. The stage is named afted the small hamlet of Priabona in the community of Monte di Malo , in the Veneto region of northern Italy . The base of the Priabonian stage is at the first appearance of calcareous nannoplankton species Chiasmolithus Chiasmolithus oamaruensis which forms the base of nannoplankton biozone NP18 . An official GSSP had in 2009 not yet been assigned. The top of the Priabonian stage the base of the Rupelian stage and Oligocene series is at the extinction of foram genus Hantkenina . Sometimes local rock strata cannot be correlation geology correlated in sufficient detail with the ICS timescale, and stratigraphers often use regional timescales as alternatives to the ICS timescale. The Priabonian overlaps for example the upper Johannian and lower Aldingan stages of the Australia n timescale or the upper Nanzian and lower Refugian stages of the California n timescale. Other regional stages ... detail with the Mammal Paleogene zones 17A through 20 ref name MP cite web last Alroy first John page The Paleobiology Database title Mammal Paleogene zones url http paleodb.org cgi bin bridge.pl ... Priabonian http stratigraphy.science.purdue.edu charts Timeslices 2 Paleogene.pdf Paleogene timescale ... timescale Fig19.1 Pal bio colA.pdf Stratigraphic chart of the Paleogene , at the website of Norges Network of offshore records of geology and stratigraphy Paleogene Footer Geological history p c Category ... more details
Paleogene The Thanetian is, in the International Commission on Stratigraphy ICS Geologic timescale , the latest age geology age or uppermost stage stratigraphy stratigraphic stage of the Paleocene epoch geology Epoch or series stratigraphy series . It spans the time between val 58.7 0.2 and val 55.8 0.2 ul Ma . The Thanetian is preceded by the Selandian age and followed by the Ypresian age part of the Eocene . ref Gradstein et al. 2004 ref The Thanetian is sometimes referred to as the Late Paleocene sub epoch. Stratigraphic definition The Thanetian was established by Switzerland Swiss geologist Eug ne Renevier in 1873. The Thanetian is named after the area of Kent southern England known as the Isle of Thanet . It shares this name with the Thanet Sand Formation , the oldest Cenozoic deposit of the London Basin . The base of the Thanetian stage is laid at the base of magnetic chronozone C26n. The references profile Global Boundary Stratotype Section and Point is in the Zumaia section 43 18 N, 2 16 W at the beach of Itzurun , Pais Vasco , northern Spain . ref Proposed by Dinar s Turell et al. 2007 , ratified by the IUGS in 2008 ref The top of the Thanetian stage the base of the Ypresian is defined at a strong negative anomaly in sup 13 sup C values at the Paleocene Eocene Thermal Maximum global thermal maximum at the Paleocene Eocene boundary . The Thanetian stage is coeval the lower Neustrian European land mammal age it spans the Mammal Paleogene zones Mammal Paleogene zone 6 and part of zones 1 through 5. ref name MP cite web last Alroy first John page The Paleobiology Database title Mammal Paleogene zones url http paleodb.org cgi bin bridge.pl?action processViewScale&scale ... 2 Paleogene.pdf Paleogene timescale , at the website of the subcommission for stratigraphic information of the ICS http norges.uio.no timescale Fig19.1 Pal bio colB.pdf Stratigraphic chart of the Paleogene , at the website of Norges Network of offshore records of geology and stratigraphy Paleogene ... more details
Paleogene In the geologic timescale the Ypresian is the oldest age geology age or lowest stage stratigraphy stratigraphic stage of the Eocene . It spans the time between val 55.8 0.2 and val 48.6 0.2 ul Ma , is preceded by the Thanetian age part of the Paleocene and is followed by the Eocene Lutetian age. The Ypresian is sometimes included with the Lutetian in an Early Eocene subepoch. Events The Ypresian age begins during the throes of the Paleocene Eocene Thermal Maximum PETM . The Messel shales in Germany are from this age. Stratigraphic definition The Ypresian stage was introduced in scientific literature by Belgium Belgian geologist Andr Hubert Dumont in 1850. The Ypresian is named after Ypres , the French language French name of the Belgian Flanders Flemish city of Ieper . The definitions of the original stage were totally different from the modern ones. ref Steurbaut 2006 ref The Ypresian shares its name with the Belgian Ieper Group French Group d Ypres , which has an Ypresian age. The base of the Ypresian stage is defined at a strong negative anomaly in sup 13 sup C values at the PETM. which suggests...? The official reference profile GSSP for the base of the Ypresian is the Dababiya profile near the Egypt ian city of Luxor . ref The GSSP was established by Dupuis et al. 2003 ref Its original type section was located in the vicinity of Ieper. The top of the Ypresian the base of the Lutetian is identified by the first appearance of the foram genus Hantkenina in the fossil ... Mammal Mega Zone s it spans the Mammal Paleogene zones 7 through 10. ref name MP cite web last Alroy first John page The Paleobiology Database title Mammal Paleogene zones url http paleodb.org cgi bin ... charts Timeslices 2 Paleogene.pdf Paleogene timescale , at the website of the subcommission ... bio colB.pdf Stratigraphic chart of the Paleogene , at the website of Norges Network of offshore records of geology and stratigraphy Paleogene Footer Geological history p c Category Eocene ast Ypresianu ... more details
Paleogene The Chattian is, in the geologic timescale , the youngest of two age geology ages or upper of two stage stratigraphy stages of the Oligocene epoch geology epoch Series stratigraphy series . It spans the time between val 28.4 0.1 and val 23.03 0.05 ul Ma . The Chattian is preceded by the Rupelian and is followed by the Aquitanian stage Aquitanian the lowest stage of the Miocene . ref Gradstein et al. 2004 ref Stratigraphic definition The Chattian was introduced by Austria n palaeontologist Theodor Fuchs in 1894. Fuchs named the stage after the Chatti , a Germanic peoples Germanic tribe. The original type locality geology type locality was near the Germany German city of Kassel . The base of the Chattian is at the extinction of the foram genus Chiloguembelina which is also the base of foram biozone P21b . An official GSSP for the Chattian stage had not been established yet in 2009. The top of the Chattian stage which is the base of the Aquitanian stage, Miocene series and Neogene system stratigraphy system is at the first appearance of foram species Paragloborotalia Paragloborotalia kugleri , the extinction of calcareous nannoplankton species Reticulofenestra Reticulofenestra bisecta which forms the base of nannoplankton biozone NN1 , and the base of magnetic chronozone C6Cn.2n. The Chattian is coeval with regionally used stages or zones like the upper Avernian European Land Mammal Mega Zone European mammal zone it spans the Mammal Paleogene zones 30 through 26 and part of 25. ref name MP cite web last Alroy first John page The Paleobiology Database title Mammal Paleogene zones url http paleodb.org cgi bin bridge.pl?action processViewScale&scale no 125 accessdate 15 ... charts Timeslices 1 Neogene.pdf Neogene timescale including the upper Paleogene ... timescale Fig19.1 Pal bio colA.pdf Stratigraphic chart of the Paleogene , at the website of Norges Network of offshore records of geology and stratigraphy Paleogene Footer Geological history p c Category ... more details
taxobox name Zhylgaia status Fossil fossil range Late Cretaceous regnum Animal ia phylum Chordate Chordata classis Bird Aves subclassis Neornithes infraclassis Neognathae genus Zhylgaia genus authority Lev Alexandrovich Nesov Nesov , 1988 species binomial Zhylgaia aestiflua binomial authority Nesov, 1988 Zhylgaia is a genus of bird s known only from fossils . Its remains have been recovered from a Late Cretaceous or Paleogene deposit in Central Asia . The relationships of this form are unknown it was initially placed in the Presbyornithidae , which at that time were believed to be some sort of transitional shorebird . Recognizing that the presbyornithids were actually a prehistoric lineage of fairly advanced waterfowl , Zhylgaia was assigned to the form taxon Graculavidae , an assemblage of Late Cretaceous and Paleocene shorebirds which are not a natural clade but merely an assemblage of outwardly similar birds. All that can be said about this taxon is that it was a Neornithes modern bird , in all probability a Neognathae neognathe . References Nesov , L. A. 1988 New Birds from the Cretaceous and Paleogene of Central Asia and Kazakhstan and Natural Conditions in Their Habitats . Trudy Zoologicheskogo Instituta Akademii Nauk SSSR 182 116 123. Article in Russian Category Cretaceous birds Category Genera of birds paleo bird stub ... more details
italictitle Automatic taxobox name Megaleptictis fossil range fossil range Late Eocene authority Meehan & Martin, 2012 in paleontology 2012 subdivision ranks Species subdivision extinction M. altidens small Meehan & Martin, 2012 type species type small Megaleptictis meaning large Leptictis is an extinct genus of large insectivore mammal from Late Paleogene latest Eocene Chadronian NALMA , but may be earliest Oligocene Orellan NALMA deposits of Custer County, South Dakota Custer County , South Dakota . It is known from the holotype Kansas University Vertebrate Paleontology KUVP 2568 a nearly complete skull including the mandible s. It was collected in an 1894 Kansas University expedition from the tan siltstone of the White River Group . It was first named by Tj Meehan and Larry D. Martin in 2011 in paleontology 2011 and the type species is Megaleptictis altidens . ref name Megaleptictis cite journal authors Tj Meehan and Larry D. Martin year 2011 title New large leptictid insectivore from the Late Paleogene of South Dakota, USA url http www.app.pan.pl archive published app56 app20110035 acc.pdf journal Acta Palaeontologica Polonica volume in press issue pages doi 10.4202 app.2011.0035 ref References reflist paleo mammal stub Category Leptictids Category Eocene mammals Category Prehistoric mammals of North America Category White River Fauna Category Fossil taxa described in 2011 ... more details
Coriops is a genus of prehistoric fish. Its fossils are found in Campanian Mesa Verde Formation , Maastrichtian Hell Creek Formation , and possibly Paleocene also Hell Creek age deposits. This chronological distribution means that the genus may have survived the Cretaceous Paleogene extinction event that killed the dinosaur s. Classification Sepkoski s compendium of marine fossil genera has it classified as an eel , but it has been classified in the Elopiformes and the Osteoglossomorpha . Species Coriops amnicolus See also Flora and fauna of the Maastrichtian stage List of prehistoric bony fish Category Cretaceous fish paleo fish stub Cretaceous stub ... more details
Taxobox fossil range Fossil range 93.5 55.8 image image caption regnum Animal ia phylum Chordata classis Chondrichthyes subclassis Elasmobranchii superordo Batoidea ordo incertae sedis subordo Sclerorhynchoidea familia Sclerorhynchidae genus Ischyrhiza genus authority Leidy, 1856 subdivision ranks Species subdivision I. antiquus I. avonicola I. marrocanus I. mira I. stromeri I. texana Ischyrhiza is an extinct genus of cartilaginous fish from the Cretaceous and Paleogene belonging to the primitive Batoidea family Sclerorhynchidae . Sources Fossils Smithsonian Handbooks by David Ward Page 205 http www.paleodb.org cgi bin bridge.pl?action checkTaxonInfo&taxon no 34688&is real user 1 The Paleobiology Database accessed on 8 21 09 Category Prehistoric fish paleo fish stub ... more details
Italic title Taxobox name Eoalligator fossil range Paleocene image EoalligatorHuiningensis PaleozoologicalMuseumOfChina May23 08.jpg image width 250px image caption Partial skull and jaw of Eoalligator huiningensis , on display at the Paleozoological Museum of China . regnum Animal ia phylum Chordata subphylum Vertebrate Vertebrata classis Reptile Sauropsida subclassis Diapsida infraclassis Archosauria ordo Crocodilia familia Alligatoridae genus Eoalligator genus authority Young, 1964 Eoalligator is an extinct genus of crocodilian which lived during the Paleocene . First described by Chinese paleontology paleontologist C.C. Young in 1964, two species have been named Eoalligator chunyii and Eoalligator huiningensis . External links http www.helsinki.fi mhaaramo metazoa deuterostoma chordata archosauria crocodylia alligatoroidea.html Alligatoroidea , Mikko s Phylogeny Archive Category Paleogene crocodylomorpha paleo archosaur stub ... more details
italic title Taxobox name Oreinotherium fossil range Fossil range Eocene regnum Animal ia phylum Chordate Chordata classis Mammal ia ordo Perissodactyla familia Brontotheriidae genus Oreinotherium Oreinotherium is a genus of brontothere . According to one source ref Mihlbachler, M.C. 2004. Phylogenetic Systematics of the Brontotheriidae Mammalia, Perissodactyla . Ph.D. Dissertation, Columbia University. 757 pp. ref , the species of Oreinotherium are merged into the genus Megacerops . References reflist Mihlbachler, M.C. , S.G. Lucas, and R.J, Emry. 2004a. The holotype specimen of Menodus giganteus , and the insoluble problem of Chadronian brontothere taxonomy. In S.G. Lucas, K. Zeigler, and P. E. Kondrashov eds. , Paleogene Mammals. Bulletin of the New Mexico Museum of Natural History 26 129 136. portal Paleontology Category Brontotheres paleo oddtoedungulate stub ... more details
The Whitneyan North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology NALMA , typically set from 33,300,000 to 30,800,000 years Before Present BP , a period of Mya 33.3 30.8 million years ref http paleodb.org cgi bin bridge.pl?action displayInterval&interval no 225 Paleobiology Database, Whitneyan ref . It is usually considered to fall within the Early Oligocene . The Whitneyan is preceded by the Orellan and followed by the Arikareean NALMA stages. The Whitneyan is interchangeable with the Rupelian age. ref http paleodb.org cgi bin bridge.pl?action displayInterval&interval no 105 Paleobiology Database, Rupelian ref Paleogene Footer References reflist Category Oligocene ... more details
The Orellan North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology NALMA , typically set from 33,900,000 to 33,300,000 years Before Present BP , a period of Mya 33.9 33.3 million years ref http paleodb.org cgi bin bridge.pl?action displayInterval&interval no 226 Paleobiology Database, Orellan ref . It is usually considered to fall within the Early Oligocene . The Orellan is preceded by the Whitneyan and followed by the Chadronian NALMA stages. The Orellan is contained within Rupelian and shares the lower boundary. Paleogene Footer References reflist Category Oligocene ... more details
The Duchesnean North American Stage on the geologic timescale is a North American Land Mammal Ages North American Land Mammal Age NALMA , with an age from 42 to 38 million years Before Present BP , representing Mya 42 38 million years ref http paleodb.org cgi bin bridge.pl?action displayInterval&interval no 228 Paleobiology Database, Duchesnean ref . It falls within the Eocene epoch. The Duchesnean is preceded by the Uintan and followed by the Chadronian NALMA. The Duchesnean falls within the Bartonian age geology age of the geologic timescale . Paleogene Footer References reflist Category Eocene ... more details
The Uintan North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology NALMA , typically set from 46,200,000 to 42,000,000 years Before Present BP lasting Mya 46.2 42 million years ref http paleodb.org cgi bin bridge.pl?action displayInterval&interval no 229 Paleobiology Database, Uintan ref . It is usually considered to fall within the Eocene epoch. The Uintan is preceded by the Bridgerian and followed by the Duchesnean NALMA stages. The Uintan is considered to be contained within the Lutetian sharing the upper boundary and contains the following substages Late Upper Uintan. Lower boundary source of the base of the Uintan approximate . Early Lower Uintan. Upper boundary source of the base of the Duchesnean approximate Paleogene Footer References reflist Category Eocene ... more details
The Puercan North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology NALMA , typically set from 65,000,000 to 63,300,000 years Before Present BP lasting Mya 65 63.3 million years ref http paleodb.org cgi bin bridge.pl?action displayInterval&interval no 236 Paleobiology Database, Puercan ref . It is usually considered to be within the Paleocene . The Puercan is followed by the Torrejonian NALMA stage. The Puercan is considered to contain the following substages Pu3 Lower boundary source of the base of the Puercan approximate . Pu2 Lower boundary source of the base of Puercan approximate and upper boundary source of the base of the Torrejonian approximate . Pu1 Lower boundary source of the base of the Puercan approximate and upper boundary source of the base of the Torrejonian approximate . Paleogene Footer References reflist Category Paleocene ... more details
Automatic taxobox fossil range Paleocene authority George Gaylord Simpson Simpson , 1937 in paleontology 1937 type species extinct N. ionensis type species authority Simpson, 1937 Necrosuchus is an extinct genus of caiman from the Paleocene . ref name CBA11 cite journal last Brochu first C.A. year 2011 title Phylogenetic relationships of Necrosuchus ionensis Simpson, 1937 and the early history of caimanines journal Zoological Journal of the Linnean Society volume 163 pages S228 S256 doi 10.1111 j.1096 3642.2011.00716.x ref References reflist portal Paleontology Category Alligatoridae Category Paleogene crocodylomorpha paleo archosaur stub ... more details
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