Lane's Little Jaw Site (Cretaceous of the United States)

Also known as LLJS Quarry; LACM 7942

Where: Powder River County, Montana (45.7° N, 105.1° W: paleocoordinates 52.3° N, 78.3° W)

• coordinate estimated from map

When: Hell Creek Formation, Maastrichtian (72.1 - 66.0 Ma)

• upper Hell Creek Formation

Environment/lithology: fluvial; sandstone and claystone

• "The fossiliferous horizon at the quarry occurs in a distinctive layer along the base of the channel cut. This layer is characterized by yellowish-buff, fine-grained sandstone matrix with numerous rounded claystone clasts and occasional pebble clasts."

Size classes: macrofossils, mesofossils

Reposited in the LACM

Primary reference: T. S. Kelly. 2014. Preliminary report on the mammals form Lane's Little Jaw Site Quarry: a latest Cretaceous (earliest Puercan?) local fauna, Hell Creek Formation, southeastern Montana. Paludicola 10(1):50-91 [P. Holroyd/P. Holroyd]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 183109: authorized by Patricia Holroyd, entered by Patricia Holroyd on 01.12.2016

Creative Commons license: CC BY (attribution)

Taxonomic list

Chondrichthyes
 Hybodontiformes - Lonchidiidae
Lonchidion selachos Estes 1964 elasmobranch
 Sclerorhynchiformes - Sclerorhynchidae
Ischyrhiza sp. Leidy 1856 elasmobranch
 Myliobatiformes - Dasyatidae
Myledaphus bipartitus Cope 1876 whiptail stingray
 Orectolobiformes -
Brachaelurus estesi carpet shark
 Orectolobiformes - Orectolobidae
Squatirhina americana Estes 1964 wobbegong
Actinopteri
 Albuliformes - Albulidae
Coriops amnicolus Estes 1969 bonefish
 Amiiformes - Amiidae
Amiidae indet. Huxley 1861 bowfin
 Lepisosteiformes - Lepisosteidae
Lepisosteus sp. Agassiz 1843 gar
Osteichthyes
 Temnospondyli - Albanerpetontidae
Albanerpeton nexuosus Estes 1981 tetrapod
Reptilia
 Testudines - Trionychidae
cf. Axestemys sp. Hay 1899 softshell turtle
 Avetheropoda - Dromaeosauridae
cf. Richardoestesia isosceles Sankey 2001 coelurosaur
cf. Saurornitholestes sp. Sues 1978 coelurosaur
cf. Dromaeosaurus sp. Matthew and Brown 1922 coelurosaur
 Avetheropoda - Troodontidae
cf. Pectinodon sp. Carpenter 1982 coelurosaur
 Avetheropoda -
cf. Paronychodon sp. Cope 1876 coelurosaur
 Avetheropoda - Tyrannosauridae
Tyrannosaurus rex Osborn 1905 tyrant lizard king
 Neornithischia - Ceratopsidae
cf. Triceratops sp. Marsh 1889 ceratopsid
 Neornithischia - Hadrosauridae
cf. Edmontosaurus sp. Lambe 1917 hadrosaurine
 Crocodylia -
cf. Borealosuchus sp. Brochu 1997 crocodilian
 Choristodera -
Champsosaurus sp. Cope 1876 choristodere
Mammalia
 Cimolesta - Cimolestidae
Cimolestes sp. Marsh 1889 eutherian
Procerberus sp. Sloan and Van Valen 1965 eutherian
(large
? Procerberus sp. Sloan and Van Valen 1965 eutherian
(small
 Tribosphenida - Arctocyonidae
Baioconodon cf. nordicus Jepsen 1930 condylarth
 Ungulata - Periptychidae
Paleoungulatum hooleyi n. gen. n. sp.
Paleoungulatum hooleyi n. gen. n. sp. Kelly 2014 condylarth
 Theriiformes - Peradectidae
Protolambda mcgilli n. sp. Kelly 2014 metatherian
Pediomys elegans Marsh 1889 metatherian
? Leptalestes sp. Davis 2007 metatherian
? Leptalestes cooki Clemens 1966 metatherian
 Didelphimorphia - Alphadontidae
Turgidodon rhaister Clemens 1966 marsupial
 Didelphimorphia - Glasbiidae
Glasbius twitchelli Archibald 1982 marsupial
 Didelphimorphia - Stagodontidae
Didelphodon vorax Marsh 1889 marsupial
cf. Eodelphis sp. Matthew 1916 marsupial
 Multituberculata - Cimolomyidae
Meniscoessus robustus Marsh 1889 multituberculate
 Multituberculata - Neoplagiaulacidae
Mesodma sp. Jepsen 1940 multituberculate
more than one species
 Multituberculata - Cimolodontidae
? Cimolodon sp. Marsh 1889 multituberculate