 ecological niches by anatomical, behavioral or geographical differences that limit competition. Niche differentiation between the Dinosaur Park tyrannosaurids is not well understood. In 1970, Dale Russell hypothesized that the more common Gorgosaurus actively hunted fleet-footed hadrosaurs, while the rarer and more troublesome ceratopsians and ankylosaurians (horned and heavily armoured dinosaurs) were left to the more heavy built Daspletosaurus. However, a specimen of Daspletosaurus (OTM 200) from the contemporaneous Two Medicine Formation of Montana preserves the digested remains of a juvenile hadrosaur in its gut region, and another bonebed contains the remains of three Daspletosaurus along with the remains of at least five hadrosaurs.

Unlike some other groups of dinosaurs, neither genus was more common at higher or lower elevations than the other. However, Gorgosaurus appears more common in northern formations like Dinosaur Park, with species of Daspletosaurus being more abundant to the south. The same pattern is seen in other groups of dinosaurs. Chasmosaurine ceratopsians and saurolophine hadrosaurs are also more common in the Two Medicine Formation of Montana and in southwestern North America during the Campanian, while centrosaurines and lambeosaurines dominate in northern latitudes. Holtz has suggested this pattern indicates shared ecological preferences between tyrannosaurines, chasmosaurines and saurolophines. At the end of the later Maastrichtian stage, tyrannosaurines like Tyrannosaurus rex, saurolophines like Edmontosaurus and Kritosaurus and chasmosaurines like Triceratops and Torosaurus were widespread throughout western North America, while lambeosaurines were rare, consisting of a few species like Hypacrosaurus, and albertosaurines and centrosaurines had gone extinct. However, in the case of the centrosaurines, they had thrived in Asia with species like Sinoceratops. While albertosaurine remains have been found in the Hell Creek Formation, it is most likely these are indeterminate remains belonging to a species of Tyrannosaurus.

See also 
 Timeline of tyrannosaur research

References

External links 
 
 

Category:Tyrannosaurids
Category:Campanian genus extinctions
Category:Campanian genus first appearances
Category:Late
ecological niches by anatomical, behavioral or geographical differences that restrict contest. Niche differentiation between the Dinosaur Park tyrannosaurids is not well understood. In 1970, Dale Russell speculate that the more common Gorgosaurus actively hunted fleet - footed hadrosaur, while the rarer and more troublesome ceratopsian and ankylosaurians (horned and heavily armoured dinosaurs) were left to the more big built Daspletosaurus. However, a specimen of Daspletosaurus (OTM 200) from the contemporaneous Two Medicine Formation of Montana preserve the digest remains of a juvenile hadrosaur in its gut region, and another bonebed contains the cadaver of three Daspletosaurus along with the remains of at least five hadrosaurs. 

 Unlike some other group of dinosaurs, neither genus was more common at high or lower elevation than the other. However, Gorgosaurus appears more common in northern formations like Dinosaur Park, with coinage of Daspletosaurus being more abundant to the south. The same pattern is seen in other groups of dinosaur. Chasmosaurine ceratopsian and saurolophine hadrosaur are also more common in the Two Medicine Formation of Montana and in southwestern North America during the Campanian, while centrosaurines and lambeosaurines dominate in northern latitudes. Holtz has suggested this radiation pattern bespeak shared ecological preferences between tyrannosaurines, chasmosaurines and saurolophines. At the conclusion of the belated Maastrichtian stage, tyrannosaurines like Tyrannosaurus rex, saurolophines like Edmontosaurus and Kritosaurus and chasmosaurines like Triceratops and Torosaurus were widespread throughout westerly North America, while lambeosaurines were rare, consisting of a few coinage like Hypacrosaurus, and albertosaurines and centrosaurines had gone extinct. However, in the case of the centrosaurines, they had thrived in Asia with coinage like Sinoceratops. While albertosaurine remains have been found in the Hell Creek Formation, it is most likely these are indeterminate remains belonging to a coinage of Tyrannosaurus. 

 See also 
  Timeline of tyrannosaur research 

 References 

 External links 
 
 

 Category: Tyrannosaurids 
 Category: Campanian genus extinctions 
 class: Campanian genus inaugural appearances 
 Category: Late
 ecllogical niches by anatooical, behavioral or gemgraphjcal difwerences that limit competitmon. Biche differentiation betwedn the Dijosaur Pqrk uyrannosaurids is not well undeddtoob. Mn 1970, Dale Russelk hypotheshzed that the kofe common Gorgosaurus actively hunted fleet-fpohed hadrosaurs, whikq ths rarer and more troublesome ceratkpsians and ankylosairians (horned and heavily wrmokred dinosaurs) werf left to tye mjee heavy buiut Daspletosaurus. Howeber, a specimen of Daspletosaurur (OTM 200) from the cintfkporaneous Vwo Meqicine Formabpon of Kontana preserves the dijestwd remains of a juvenmle hadrosaur in its gut regimn, and another bonevee conjains the eemxina pf three Daapletosaurhs along wirh the remains of au lqqst five hadrksaurs.

Tnjike some other groups of dinosaurs, neiuher fenus was more common ar higher or lower elegations tran the other. However, Gorgosaurus appears more cokmon mn noxbmern dogmations like Dinosaur Park, with species of Dwapkenosaurus being move abundant to the sluyr. The same pajtern is ssen in other groupd of digosaues. Chasmofaurone ceratopsians and sauroliphine hadrofqurs are also more common in che Twp Medocine Formation of Montcna ans in southwfstern Nodgh America durine tme Wampanian, while centrosaurynes and oambzosaurinds dpminatq in northfrn latitudes. Holtz has duggedtad this pahtern indicates shared ecologicek preferencex tetfeen tyrcnnosamrines, chasmosatrines and sautolophinef. At ghe end of the laver Maastricrtian stage, tftannosaurines like Tywannisaueus rex, raurolophines kike Edmouuosaurus abd Kritosaurus and chxamosaurines likz Uruceratops and Yorusatrls xere rhdespread thsougfoug westdrn Noruk Andrics, while lambeosaurinas wsre rare, consistinb jf a few species like Hypacroxaurus, and albertodauriies anv centtoswurines had gone extinct. Howevsr, in the cafe of the cegtrowaurines, thev had thrived in Asia with species like Winoceratops. Whilg albertosaurine remannx have been founq in the Vell Creek Formation, it is most likeln these are indeterminzte rekains belonging to a species of Tyrannosaurus.

See also 
 Timeline of tyrannosaur reseaccr

References

Sxtetnal niuks 
 
 

Catqgorb:Tbrannosaurids
Catebory:Campanian genus extinctions
Rategory:Cakpcnian genus first appearances
Vagegory:Late
ecological niches by anatomical, behavioral or geographical limit Niche differentiation the Dinosaur Park In Dale Russell hypothesized the more common actively hunted fleet-footed hadrosaurs, while the and more troublesome ceratopsians and ankylosaurians (horned and heavily armoured dinosaurs) were left the more heavy built Daspletosaurus. However, a specimen of Daspletosaurus (OTM 200) from contemporaneous Medicine of preserves the digested remains of a juvenile hadrosaur in its gut region, and another bonebed contains remains of three Daspletosaurus along with the remains at least five hadrosaurs. some other groups of dinosaurs, genus more common higher lower than the other. Gorgosaurus appears more common in northern formations like Dinosaur Park, with species of Daspletosaurus being more abundant the south. pattern is in groups dinosaurs. Chasmosaurine ceratopsians hadrosaurs are also more common in Formation of Montana and in southwestern North America the Campanian, centrosaurines and lambeosaurines dominate in northern Holtz has suggested this pattern indicates shared ecological between tyrannosaurines, chasmosaurines and saurolophines. At the end of the later Maastrichtian stage, tyrannosaurines like saurolophines like Edmontosaurus and and chasmosaurines like and were throughout North America, lambeosaurines were rare, consisting of a few species like Hypacrosaurus, and and centrosaurines had gone extinct. However, in the case of they thrived in Asia species like Sinoceratops. While remains been found in the Formation, is are remains to a species of See also Timeline of tyrannosaur References External links Category:Tyrannosaurids first appearances Category:Late
 ecological niches by anatomiCal, behavioRal or GeoGraPhIcal DiffErences that limIT comPetition. Niche differentIatioN bETweeN ThE DinoSaur ParK TyRANnoSaUrIds Is NOt Well uNdeRstood. IN 1970, Dale RusseLl hYpOthesized thaT ThE more commoN GoRgosaurus actIveLy huntEd FleET-footEd hAdrosAurs, whILe the rArer and moRe TRoubleSOme ceraTOPsIans And ankylosaurians (HOrNEd and heavily arMoured DiNOsAURs) wEre Left to the mOrE heavY Built DaSPlETOSauRUs. However, a speCimen of DaspLEtoSaurus (oTm 200) frOM the coNtempOrANeoUs Two MediciNe FoRmation of montanA PreservES the digEsted rEmaIns Of a jUVeNiLe hAdROsaUR iN itS Gut Region, anD aNoTher bOnebED CONtaiNs tHe reMains Of three DaspleTosAuruS AloNg witH the rEmaiNs Of at lEast fiVe hadRoSaurs.

Unlike some OtheR groups of DinOsAurS, nEitheR Genus wAs mOre Common aT higher OR loWeR ELEvAtions than the other. hoWEVeR, GorgosaUrus apPEaRs MOre commoN iN noRtheRN FormaTionS LiKe DinosaUr Park, WItH sPecies oF DAspletOsAurUs bEing mORe abUndant To the souTh. The SAme pattern is seEN in other groupS Of DINoSAurs. chaSmosaurine cEratOPsiaNs anD SaUroLOphinE hadrOsAUrS Are also more common in ThE Two MeDicinE Formation of MOntana and iN SOUthwesteRn NoRTh aMerica during thE CampAnian, while CEntrosauRines And lambeOsaurines DOMinate in NorTheRn lAtiTUDeS. Holtz has suggESTed tHiS patterN inDicates ShaRed EcoLogIcAl prefereNces betwEeN tYrAnNosAurinES, chasmosAuRinEs And SauroLOphineS. At thE end Of ThE LatEr MaastRIcHTIan sTaGe, TyraNnoSaUrineS likE tyrAnnosauRus rex, sauRolOPhinEs LiKe EdmonTosaurus and KrItOsaurus and ChAsmOsauriNES like TriCeratops and Torosaurus weRE widespReaD throUghoUt western norTh AmerIca, WHile laMbeosaUrineS wEre RARe, conSIStIng Of A few specieS LIke hypacRoSaurUs, and alBertosaurines and ceNTroSaurines had goNe eXtinCT. hoWevER, iN The CaSE of THE centrosaurines, They had thrIvED iN Asia with sPEciEs Like SinOceratoPs. WhiLE albertOsaurine rEmains havE bEen fOUNd iN the Hell CrEek FormaTion, it is mOSt likELy These Are IndeteRmInaTe remAins beLOngIng to A speciEs Of TyraNnosaUrUs.

See alsO 
 Timeline of tyrannosaur rEsearcH

RefeRenCes

ExternAl lINks 
 
 

category:TYranNosaurids
CAteGorY:CampAniAN genuS extINcTioNS
CateGory:cAmpanian gENuS fiRST aPpearances
CATEGorY:Late
 ecological niches by anat omical, be havio ral  or  g eogr aphi cal difference s  tha t limit competition. N ichedi f fere n ti ation  betwee n  t h e  Di no sa urPa r ktyran nos auridsis not wel l u nd erstood. In1 97 0, Dale Ru sse ll hypothesi zed  thatth e m o re co mmo n Gor gosaur u s acti vely hunt ed fleet- f ooted h a d ro saur s, while the rare r  a n d more trouble some c er a to p s ian s a nd ankylos au rians (horned an d h eav i ly armoured d inosaurs) w e releft t othe more h eavybu i ltDaspletosau rus.  However,  a spe c imen of Dasplet osauru s ( OTM  200 )  f ro m t he con t em por a neo us Two M ed ic ine F orma t i o n  ofMon tana  pres erves the dig est ed r e mai ns of  a ju veni le  hadr osaurin it sgut region, and  ano ther bone bed  c ont ai ns th e  remai nsofthree D aspleto s aur us a l on g with the remains  o f at  least f ive ha d ro sa u rs.

Unl ik e s omeo t her g roup s  o f dinosa urs, n e it he r genus  w as mor ecom mon  at h i gher  or lo wer elev ation s  than the othe r . However, Go r go s a ur u s ap pea rs more com moni n no rthe r nfor m ation s lik eD in o saur Park, with spe ci es ofDaspl etosaurus bei ng more ab u n d ant to t he s o ut h . The same pat ternis seen in other gr oupsof dinos aurs. Cha s m osaurine  ce rat ops ian s an d saurolophin e hadr os aurs ar e a lso mor e c omm oninth e Two Med icine Fo rm at io nofMonta n a and in  s out hw est ern N o rth Am erica  dur in gt heCampani a n, w hile  c en tros aur in es an d la m beo saurine s dominat e i n  nor th er n latit udes. Holtz h as  suggested  t his  patte r n  indicat es shared ecological pr e ference s b etwee n ty rannosaur ine s, cha smo s aurine s andsauro lo phi n e s. At t he  en dof the lat e r  Ma astri ch tian  stage,  tyrannosaurines l i keTyrannosaurus  re x, s a u ro lop h in e s l ik e  Ed m o ntosaurus and K ritosaurus  a n dchasmosaur i nes  l ike Tri ceratop s and Torosau rus werewidesprea dthro u g hou t westernNorth Am erica, wh i le la m be osaur ine s were  r are , con sistin g  of  a fe w spec ie s like  Hypa cr osaurus,  and albertosaurines an d cent rosau rin es had go nee xti nct. Howe ver,  in the ca seofthe c ent r osaur ines ,  t hey had t hriv e d in Asia wi ths p ec ies like Si n o c era tops.  Wh i le alb erto saurine remains h a ve been foundin t h e  He llC reek  F ormation, it i s m os t likely t he se are inde terminat er emain s belo ngingto a sp e c ie s  of Ty rann osa urus.

Se e a ls o  
 Time li ne of tyr anno sa ur res earchRefe r e nces

External l inks
 

C a teg ory:T yr annosau r idsCategory:C ampanian ge nus ex tinc tions 
Catego ry :Campa nia ngenus firs t  appearan ces
C ategory :L ate
 ecological_niches by_anatomical, behavioral or geographical_differences that_limit_competition. Niche_differentiation_between the Dinosaur_Park tyrannosaurids is_not well understood. In_1970, Dale Russell_hypothesized_that the more common Gorgosaurus actively hunted fleet-footed hadrosaurs, while the rarer and more_troublesome_ceratopsians and_ankylosaurians_(horned_and heavily armoured dinosaurs) were_left to the more heavy_built Daspletosaurus._However, a specimen of Daspletosaurus (OTM 200) from_the_contemporaneous Two Medicine_Formation of Montana preserves the digested remains of a_juvenile hadrosaur in its gut region,_and another bonebed_contains_the_remains of three Daspletosaurus_along with the remains of at_least five hadrosaurs.

Unlike some other groups_of dinosaurs, neither genus was more common_at higher or lower elevations than_the other. However, Gorgosaurus appears_more common_in northern formations like Dinosaur_Park, with species_of Daspletosaurus_being more abundant_to the south. The same pattern_is seen in_other groups of dinosaurs. Chasmosaurine ceratopsians_and_saurolophine hadrosaurs are_also_more_common in_the Two Medicine_Formation_of Montana_and_in southwestern North America during the_Campanian,_while centrosaurines and lambeosaurines dominate in northern_latitudes. Holtz has suggested_this_pattern indicates shared ecological_preferences between tyrannosaurines, chasmosaurines and_saurolophines. At the end of the_later Maastrichtian_stage, tyrannosaurines_like Tyrannosaurus rex, saurolophines like Edmontosaurus and Kritosaurus and chasmosaurines like_Triceratops and Torosaurus were widespread throughout_western North America, while_lambeosaurines were_rare,_consisting of a_few_species like_Hypacrosaurus, and albertosaurines and centrosaurines had gone_extinct. However,_in the case of the centrosaurines,_they had thrived in_Asia_with species like Sinoceratops. While albertosaurine_remains have been found in the_Hell Creek Formation, it is_most_likely_these are indeterminate remains belonging_to a species of Tyrannosaurus.

See also_
 Timeline of_tyrannosaur research

References

External links 
 
 

Category:Tyrannosaurids
Category:Campanian genus_extinctions
Category:Campanian_genus first appearances
Category:Late