Hogback South, MNA Locality A (Cretaceous of the United States)

Also known as Fruitland Formation vertebrates, UCMP V-72090, MNA #16, HW#24

Where: San Juan County, New Mexico (36.5° N, 108.5° W: paleocoordinates 43.8° N, 79.8° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Fruitland Formation, Late/Upper Campanian (83.5 - 70.6 Ma)

• within the upper 15.2 m of the Fruitland

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; silty mudstone and lenticular, calcareous sandstone

Size classes: macrofossils, mesofossils

Reposited in the UCMP

Collection methods: bulk, anthill, chemical, sieve,

• MNA locality #16, used tandem screen boxes, with 1/16 inch mesh size and 1/25 inch mesh. Some samples were disaggregated using Amine 220 and Methyl Amyl Alcohol.

Primary reference: J. G. Armstrong-Ziegler. 1978. An aniliid snake and associated vertebrates from the Campanian of New Mexico. Journal of Paleontology 52(2):480-483 [J. Alroy/E. Leckey/E. Leckey]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 36449: authorized by John Alroy, entered by Erin Leckey on 29.01.2004, edited by Matthew Carrano, John Alroy and Roger Benson

Creative Commons license: CC BY (attribution)

Taxonomic list

• JA: mammals listed by Armstrong-Ziegler are incorporated into the Lower Hunter Wash list of Flynn 1986 (collection 14498)
Bivalvia
 Pholadida - Pholadidae
Chondrichthyes
 Myliobatiformes - Dasyatidae
Myledaphus bipartitus Cope 1876 whiptail stingray
Actinopteri
 Acipenseriformes - Acipenseridae
Acipenser eruciferus Cope 1876 sturgeon
 Elopiformes - Phyllodontidae
Paralbula casei Estes 1969
 Amiiformes - Amiidae
Amia fragosa Jordan 1927 bowfin
 Lepisosteiformes - Lepisosteidae
Osteichthyes
 Proteida - Batrachosauroididae
Prodesmodon ? copei Estes 1964 tetrapod
fragmentary ?cervical vertebra
 Salientia -
Scotiophryne pustulosa Estes 1969 frog
fragmentary posterior portion of left maxilla
Reptilia
 Testudines - Trionychidae
Trionychidae indet.1 Gray 1825 softshell turtle
plastron and carapace fragments
 Testudines - Compsemydidae
Compsemys sp. Leidy 1856 turtle
carapace fragment
 Testudines -
Cryptodira indet.4 Cope 1868 turtle
 Testudines - Nanhsiungchelyidae
? Basilemys sp. Hay 1902 turtle
shell fragments
 Testudines - Adocidae
Adocus sp. Cope 1868 turtle
isolated carapace and plastron fragments
 Avetheropoda -
Paronychodon lacustris3 Cope 1876 coelurosaur
isolated teeth
Deinodon horridus Leidy 1856 coelurosaur
isolated teeth
 Avetheropoda - Dromaeosauridae
? Dromaeosauridae indet. Colbert and Russell 1969 coelurosaur
isolated teeth
 Avetheropoda - Coeluridae
? Coeluridae indet. Marsh 1881 coelurid
isolated teeth
 Loricata -
Crocodylia indet.2 crocodilian
isolated teeth
 Crocodylia - Alligatoridae
Brachychampsa sp. Gilmore 1911 crocodilian
isolated teeth
 Crocodylia -
? Thoracosaurus sp. Leidy 1852 crocodilian
isolated teeth
 Squamata - Teiidae
Teiidae indet.5 Gray 1827 lizard
fragment of dentary (MNA Pl. 1613)
 Squamata -
Coniophis cosgriffi n. sp. Armstrong-Ziegler 1978 snake