Species: browni SIMPSON, 1927
Etymology:

Holotype: AMNH 14410

Locality: “Near the head of the east fork of Crooked Creek”, Dawson County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Lower M2.

Referred material:

YPM 14907: ?Left LM2.

 

ARCHIBALD, 1982

Locality: V73083, Flat Creek 1, Garfield County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UCMP 108967: Left maxillary fragment with UM1 and part of alveoli for UM1.

UCMP 108965: Left LM2.

 

Locality: V73087, Flat Creek 5, Garfield County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UCMP 109025: Fragment of UM1.

UCMP 116979: Fragment of UM1.

 

Locality: V73076, Engdahal Anthills 2, Garfield County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UCMP 116980: Fragment of Left UM1.

UCMP 116981: Fragment of left UM2.

 

 

Locality: V76138, Clam Hollow, Garfield County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UCMP 120397: Left maxillary fragment with alveolus and root of UP3, broken and worn UP4, and UM1-2.

 

Locality: V77130, Hauso 1, Garfield County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UCMP 120393: RUM1.

UCMP 120396: RLM1.

UCMP 120391: Fragmentary dentary with left LM1.

 

Locality: Bug Creek Anthills, McCone County, Montana.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

MCZ 19982: Fragment of right LM2.

CM 37160: Left UM2.

Numbers: Not given: And various other isolated teeth.

 

Locality: Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

YPM 34527: RLM1.

USNM 215120: LUM2.

USNM 244198: LUM2.

 

ARMSTRONG-ZIEGLER, 1978

Locality: 50 km southwest of Farmington, San Juan Basin, New Mexico.

Horizon: Fruitland Formation.

Biostratigraphy:

Age: Kirtlandian Age, Late Campanian Stage, Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

Number: Not given:

 

BOYD, PERSON & BARNES, 2017

Locality: NDGS L226 (= PTRM V98027), Slope County, southwestern North Dakota.

Horizon: Hell Creek Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

NDBS 1792: Right dentary with m1.

DONOHUE, WILSON, & BREITHAUPT, 2013

Locality: UCMP V-84215 (= UW V-79032), Black Butte Station fossil localitys, eastern flank of the Rock Springs uplift, Sweetwater County, Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UW 15122: Left dentary fragment containing m1.

UW 17374: Isolated right m1 fragment.

UW 25151: Isolated right m2.

UW 20073: Isolated left M2.

= ?Essodon browni

UCMP 197657: Left p4.

FOX, 1989

Locality: Wounded Knee local fauna, a roadcut along Rte. 37, approximately 34 km south of Shaunavon, Saskatchewan Province, Canada.

Horizon: Frenchman Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UALVP 22675: Maxillary fragment containing UM1.

 

LEHMAN, 1984

Locality: University of New Mexico locality BUNM77-675, San Juan Basin, New Mexico.

Horizon: Naashoibito Member, Latest Kirtland Formation.

Biostratigraphy:

Age: Kirtlandian age, uppermost Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

UNM FKK-020: Left LM1.