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 52.1° N, 78.9° W)

• coordinate estimated from map

When: Hell Creek Formation, Late/Upper Maastrichtian (70.6 - 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

Show authors, comments, and common names
Mammalia
 Theriamorpha - Stagodontidae
cf. Eodelphis sp., Didelphodon vorax
cf. Eodelphis sp. Matthew 1916 metatherian
Didelphodon vorax Marsh 1889 metatherian
 Polydolopimorphia - Glasbiidae
Glasbius twitchelli
Glasbius twitchelli Archibald 1982 metatherian
 Theriamorpha - Pediomyidae
Pediomys elegans, ? Leptalestes sp., ? Leptalestes cooki, Protolambda mcgilli n. sp.
Pediomys elegans Marsh 1889 metatherian
? Leptalestes sp. Davis 2007 metatherian
? Leptalestes cooki Clemens 1966 metatherian
Protolambda mcgilli n. sp. Kelly 2014 metatherian
 Theriamorpha - Alphadontidae
Turgidodon rhaister
Turgidodon rhaister Clemens 1966 metatherian
 Theriamorpha - Periptychidae
Paleoungulatum hooleyi n. gen. n. sp.
Paleoungulatum hooleyi n. gen. n. sp. Kelly 2014 condylarth
 Procreodi - Arctocyonidae
Baioconodon cf. nordicus
Baioconodon cf. nordicus Jepsen 1930 condylarth
 Cimolesta - Cimolestidae
Procerberus sp., ? Procerberus sp., Cimolestes sp.
Procerberus sp. Sloan and Van Valen 1965 eutherian
(large
? Procerberus sp. Sloan and Van Valen 1965 eutherian
(small
Cimolestes sp. Marsh 1889 eutherian
 Multituberculata - Neoplagiaulacidae
Mesodma sp.
Mesodma sp. Jepsen 1940 multituberculate
more than one species
 Multituberculata - Cimolodontidae
? Cimolodon sp.
? Cimolodon sp. Marsh 1889 multituberculate
 Multituberculata - Cimolomyidae
Meniscoessus robustus
Meniscoessus robustus Marsh 1889 multituberculate
Reptilia
 Crocodylia - Alligatoridae
Brachychampsa montanus
 Loricata -
cf. Borealosuchus sp.
cf. Borealosuchus sp. Brochu 1997 crocodilian
 Ornithischia - Hadrosauridae
cf. Edmontosaurus sp.
cf. Edmontosaurus sp. Lambe 1917 hadrosaurine
 Ornithischia - Ceratopsidae
cf. Triceratops sp.
cf. Triceratops sp. Marsh 1889 ceratopsid
 Theropoda - Troodontidae
cf. Pectinodon sp.
cf. Pectinodon sp. Carpenter 1982 maniraptoran
 Theropoda - Dromaeosauridae
cf. Richardoestesia isosceles, cf. Dromaeosaurus sp., cf. Saurornitholestes sp.
cf. Richardoestesia isosceles Sankey 2001 maniraptoran
cf. Dromaeosaurus sp. Matthew and Brown 1922 maniraptoran
cf. Saurornitholestes sp. Sues 1978 maniraptoran
 Theropoda -
cf. Paronychodon sp.
cf. Paronychodon sp. Cope 1876 maniraptoran
 Theropoda - Tyrannosauridae
Tyrannosaurus rex
Tyrannosaurus rex Osborn 1905 tyrant lizard king
 Choristodera -
Champsosaurus sp.
Champsosaurus sp. Cope 1876 choristodere
 Testudines - Trionychidae
cf. Axestemys sp.
cf. Axestemys sp. Hay 1899 softshell turtle
Amphibia
 Temnospondyli - Albanerpetontidae
Albanerpeton nexuosus
Albanerpeton nexuosus Estes 1981 tetrapod
Actinopteri
 Albuliformes - Albulidae
Coriops amnicolus
Coriops amnicolus Estes 1969 bonefish
 Lepisosteiformes - Lepisosteidae
Lepisosteus sp.
Lepisosteus sp. Agassiz 1843 gar
 Amiiformes - Amiidae
Amiidae indet.
Amiidae indet. Huxley 1861 bowfin
Chondrichthyes
 Hybodontiformes - Lonchidiidae
Lonchidion selachos
Lonchidion selachos Estes 1964 elasmobranch
 Orectolobiformes - Orectolobidae
"Squatirhina americana" = Restesia americana
"Squatirhina americana" = Restesia americana Estes 1964 wobbegong
 Orectolobiformes - Brachaeluridae
Brachaelurus estesi
Brachaelurus estesi Herman 1977 carpet shark
 Rajiformes - Sclerorhynchidae
Ischyrhiza sp.
Ischyrhiza sp. Leidy 1856 ray
 Rajiformes - Rhinobatidae
Myledaphus bipartitus
Myledaphus bipartitus Cope 1876 guitarfish