Arkadelphia Marl

The Arkadelphia Marl, also called the Arkadelphia Formation, is a geologic formation in Arkansas in Clark, Nevada, and Hempstead counties. It preserves fossils dating back to the late Maastrichtian stage of the Cretaceous period.

Paleofauna Bony fish Bony fish reported from the Arkadelphia Formation Genus Species Presence Material Notes ImagesAlbulidae indet.IndeterminateCabot, Arkansas.4 small, eroded otoliths.A bonefish.AmpheristusA. cf. A. americanusCabot, Arkansas.6 otoliths.An ophidiiform.AnguillaA.? chickasawaeCabot, Arkansas.6 otoliths.An eel.ApateodusA. crenellatus?Cabot, Arkansas.3 otoliths.An aulopiform.AriusA.? subtilisCabot, Arkansas.A well-preserved otolith (DMNH 2021-09-11).A catfish.Clupeiformes? indeterminateIndeterminateCabot, Arkansas.An eroded, broken otolith (DMNH 2021-09-10).A clupeiform.EchiophisE. aff. E. semisphaeroidesCabot, Arkansas.11 otoliths.An eel.ElopothrissusE. sp.Cabot, Arkansas.One otolith (DMNH 2021-09-03).A bonefish.ElopsE. sp.Cabot, Arkansas.A small, broken otolith (DMNH 2021-09-01).A ladyfish.EutawichthysE. maastrichtiensisCabot, Arkansas.21 otoliths.A beryciform.E. cf. E. stringeriCabot, Arkansas.48 otoliths.A beryciform.E. zidekiCabot, Arkansas.287 otoliths.A beryciform.Gadiformes indeterminateIndeterminateCabot, Arkansas.11 very small or broken otoliths.A gadiform.GenartinaG. sp. 1Cabot, Arkansas.One otolith (DMNH 2021-09-04).KokenichthysK. navisCabot, Arkansas.2 eroded otoliths.An osteoglossiform.Lapillus type 1IndeterminateCabot, Arkansas.A small, slightly eroded otolith (DMNH 2021-09-31).An unidentified fish otolith.MuraenanguillaM.? sp.Cabot, Arkansas.2 worn, broken otoliths.An eel.OsmeroidesO. sp.Cabot, Arkansas.3 otoliths.PalaeogadusP.? belliCabot, Arkansas.Multiple otoliths.A gadiform.P. cf. P. weltoniCabot, Arkansas.A small, slightly eroded otolith (DMNH 2021-09-23).A gadiform.ProtobythitesP. brzobohatyiCabot, Arkansas.4 otoliths.An ophidiiform.TippahaT. mythicaCabot, Arkansas.8 otoliths.A holocentriform.VorishiaV. vulpesCabot, Arkansas.1,537 otoliths.A catfish.

Rays Rays reported from the Arkadelphia Formation Genus Species Presence Material Notes ImagesDasyatisD. sp.Ouachita River northwest of Malvern, Arkansas.3 oral teeth (AMNH 20194-20196) A stingray.IschyrhizaI. avonicolaOuachita River northwest of Malvern, Arkansas.8 teeth (AMNH 20164-20171).A sawskate.I. miraOuachita River northwest of Malvern, Arkansas.3 oral teeth (AMNH 20172-20174).A sawskate.PtychotrygonP. cf. P. vermiculataOuachita River northwest of Malvern, Arkansas.4 oral teeth (AMNH 20183-20186).A sawskate.RajaR. farishiOuachita River northwest of Malvern, Arkansas.3 oral teeth (AMNH 20187-20189).A skate.RhinobatosR. casieriOuachita River northwest of Malvern, Arkansas.4 oral teeth (AMNH 20160-20163).A guitarfish.RhombodusR. binkhorstiOuachita River northwest of Malvern, Arkansas.4 oral teeth (AMNH 20190-20193) A rajiforme.SchizorhizaS. cf. S. stromeriOuachita River northwest of Malvern, Arkansas.5 rostral teeth (AMNH 20178-20182).A sawskate.SclerorhynchusS. sp.Ouachita River northwest of Malvern, Arkansas.3 rostral teeth (AMNH 20175-20177).A sawskate.

Sharks Sharks reported from the Arkadelphia Formation Genus Species Presence Material Notes ImagesCarchariasC. cf. C. holmdelensisOuachita River northwest of Malvern, Arkansas.5 anterior teeth (AMNH 20139-20143).A sand shark.GaleorhinusG. girardotiOuachita River northwest of Malvern, Arkansas.4 lateral teeth (AMNH 20156-20159).A houndshark.GinglymostomaG. lehneriOuachita River northwest of Malvern, Arkansas.4 lateral teeth (AMNH 20132-20135).A carpet shark.OdontaspisO. aculeatusOuachita River northwest of Malvern, Arkansas.2 lateral teeth (AMNH 20137 & 20138).A sand shark.PlicatoscylliumP. cf. P. derameeiOuachita River northwest of Malvern, Arkansas.Lateroanterior tooth (AMNH 20136).A carpet shark.SerratolamnaS. serrataOuachita River northwest of Malvern, Arkansas.6 teeth (AMNH 20144-20149).A mackerel shark.SqualicoraxS. kaupiOuachita River northwest of Malvern, Arkansas.6 lateral teeth (AMNH 20150-10155).A mackerel shark.SquatinaS. hasseiOuachita River northwest of Malvern, Arkansas.4 lateral teeth (AMNH 20128-20131).An angelshark.

Arkadelphia Marl

Bron en licentie