San Jon (Basal Tucumcari Formation) (Cretaceous of the United States)

Where: Quay County, New Mexico (35.1° N, 103.3° W: paleocoordinates 33.7° N, 62.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Tucumcari Formation, Albian (113.0 - 100.5 Ma)

• 1.2 m part of section including several beds

• group of beds-level stratigraphic resolution

Environment/lithology: shoreface; gray, conglomeratic shale and conglomeratic, calcareous sandstone

• "open bay to lower to upper shoreface environments"
• "in ascending order... gray to grayish-brown shale containing rounded quartzite pebbles and cobbles up to 5 cm in diameter, highly fissile dark gray shale, and an upper interval consisting of interbedded dark gray shale and three thin, calcareous, locally conglomeratic, sandstone ledges"

Size class: macrofossils

Primary reference: B. S. Kues. 1997. New bivalve taxa from the Tucumcari Formation (Cretaceous, Albian), New Mexico, and the biostratigraphic significance of the basal Tucumcari fauna. Journal of Paleontology 71(5):820-839 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 37561: authorized by John Alroy, entered by John Alroy on 16.03.2004, edited by Mihaela Krause

Creative Commons license: CC BY (attribution)

Taxonomic list

Textulariina
 Hormosinacea - Cribratinidae
Polychaeta
 Sabellida - Serpulidae
Bivalvia
 Myalinida - Inoceramidae
 Pectinida - Pectinoidae
 Pectinida - Limidae
Lima wacoensis file clam
Lima utahensis file clam
Lima sp. Bruguière 1797 file clam
 Pectinida - Plicatulidae
Plicatula quayensis n. sp. Kues 1997 scallop
 Ostreida - Gryphaeidae
Gyrostrea hinchada n. sp. Kues 1997 oyster
"Ceratostreon texanum" = Amphidonte (Ceratostreon) oyster
 Ostreida - Ostreidae
Peilinia levicostata n. gen. Kues 1997 oyster
 Ostreida - Pteriidae
 Ostreida - Pinnidae
 Carditida - Astartidae
 Carditida - Carditidae
 Cardiida - Glossidae
""Isocardia" aff. slatana" = Glossus
""Isocardia" aff. slatana" = Glossus clam
 Cardiida - Veneridae
? Aphrodina sp. Conrad 1869 venus clam
 Cardiida - Tellinidae
"? Linearia (Liothyris) aff. kansasensis" = Linearis
"? Linearia (Liothyris) aff. kansasensis" = Linearis tellin clam
 Cardiida - Cardiidae
 Pholadomyida - Pholadomyidae
Pholadomya sp. Sowerby 1823 clam
 Lucinida - Lucinidae
? Parvilucina sp. Dall 1901 clam
 Trigoniida - Megatrigonioidae
"Scabrotrigonia emoryi" = Pterotrigonia (Scabrotrigonia)
"Scabrotrigonia emoryi" = Pterotrigonia (Scabrotrigonia) clam
Gastropoda
 Neogastropoda - Sarganidae
 Stromboidea - Aporrhaidae
 Naticoidea - Naticidae
Euspira cragini moon snail
 Sorbeoconcha - Turritellidae
Turritella seriatimgranulata Roemer 1849 turret shell
 Seguenzioidea - Eucyclidae
 Trochoidea - Trochidae
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium (Dentalium) sp. Linnaeus 1758 tusk shell
Cephalopoda
 Ammonitida - Brancoceratidae
Mortoniceras equidistans Cobban 1987 ammonite
Gymnolaemata
 Ctenostomata - Vinellidae
Vinella sp. Ulrich 1890
Chondrichthyes
 Lamniformes - Cretoxyrhinidae
aff. Cretodus sp. Sokolov 1965 mackerel shark
Actinopteri
 Pycnodontiformes - Pycnodontidae
Coelodus sp. Haeckel
Echinoidea
 Spatangoida - Hemiasteridae
Anthozoa
 Scleractinia - Montastraeidae
? Montastraea sp. Blainville 1830 stony coral
 Scleractinia - Montlivaltiidae
"Rennensismilia stainbrooki" = Trochosmilia stainbrooki
"Rennensismilia stainbrooki" = Trochosmilia stainbrooki Wells 1933 stony coral
 Scleractinia - Caryophylliidae
Coelosmilia texana Conrad 1857 stony coral