罕见化石记录(a rare fossil record)

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1、罕见化石记录(ARareFossilRecord)　　thepreservatinfebrsanduvenilesisarateurreneinthefssilrerdthetin,deliateseletnsareusuallsatteredbsavengersrdestredbeatheringbefretheanbefssilized　　ihthsaurshadahigherhanefbeingpreservedthandidterrestrialreaturesbeause,asarineanials,thetendedtliveinenvirnentsl

2、esssubettersinstill,theirfssilizatinrequiredasuiteffatrs:aslratefdeafsfttissues,littlesavengingbtheranials,alafsifturrentsandavestubleandarraasallbnes,andfairlrapidburialgiventhesefatrs,seareashavebeeatreasurfell-preservedihthsaurfssils　　thedepsitsathlzaden,geran,presentaninterestinga

3、sefranalsistheihthsaurreainsarefundinbla,bituinusarineshalesdepsitedabut190illinearsagvertheears,thusandsfspeiensfarinereptiles,fishandinvertebrateshavebeenreveredfrthesers　　thequalitfpreservatinisutstanding,buthatisevenreipressiveisthenuberfihthsaurfssilsntainingpreservedebrsihthsaur

4、sithebrshavebeenreprtedfr6differentlevelsftheshaleinasallareaarundhlzaden,suggestingthataspeifisiteasusedblargenubersfihthsaursrepeatedlvertietheebrsarequiteadvanedintheirphsialdevelpent;theirpaddles,frexaple,arealreadellfrednespeienisevenpreservedinthebirthanalinadditin,theshalentain

5、sthereainsfannebrnsthatarebeteen20and30inheslng　　haretheresanpregnantfealesandungathlzadenhenthearesrareelsehere?thequalitfpreservatinisalstunathedandquarrperatinshavebeenarriedutarefullithanaarenessfthevaluefthefssils　　butthesefatrsdntauntfrtheinterestingquestinfhthereaetbesuhanentra

6、tinfpregnantihthsaursinapartiularplaeverlsettheirtiefgivingbirth