USGS 22883. Muldoon Hill (Cretaceous of the United States)

Where: Colorado (38.1° N, 104.9° W: paleocoordinates 38.0° N, 67.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Conlinoceras gilberti ammonoid zone, Thatcher Limestone Member (Graneros Shale Formation), Cenomanian (100.5 - 93.9 Ma)

• formation-level stratigraphic resolution

Environment/lithology: gray limestone

• Limestone, dark-gray; weathers dark brown, very hard. Somewhat fossiliferous. Basal part locally has cone-in-cone structure. Locally thins to 6 in. in thickness. Calycoceras and other fossils mainly found at top or in upper few inches

Size class: macrofossils

Reposited in the USGS, USNM

Primary reference: W. A. Cobban and G. R. Scott. 1972. Stratigraphy and ammonite fauna and the Graneros Shale and Greenhorn Limestone near Pueblo, Colorado. United States Geological Survey Professional Paper. United States Geological Survey Professional Paper 645:1-108 [L. Bulot/L. Bulot]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 230801: authorized by Pete Wagner, entered by Pete Wagner on 21.07.2023

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Gastropoda indet.
Anthozoa
 Hexacorallia -
Scleractinia "Solitary coral"
Scleractinia "Solitary coral" Bourne 1900 stony coral
Polychaeta
 Serpulimorpha -
? Diploconcha sp.
Bivalvia
 Pectinida - Pectinoidae
"Pecten (Camptonectes) cf. cavanus" = Camptonectes
"Pecten (Camptonectes) cf. cavanus" = Camptonectes scallop
 Pectinida - Limidae
? Limatula sp.
? Limatula sp. Wood 1839 file clam
 Ostreida - Gryphaeidae
Exogyra sp.
Exogyra sp. Say 1820 oyster
 Myalinida - Inoceramidae
Inoceramus sp.
Inoceramus sp. Sowerby 1814 clam
 Arcida - Arcidae
Breviarca sp.
Breviarca sp. Conrad 1872 clam
 Nuculanida - Nuculanidae
? Nuculana sp.
? Nuculana sp. Link 1807 pointed nut clam
Scaphopoda
  -
Scaphopoda indet.
Scaphopoda indet. Bronn 1862 tusk shell
Cephalopoda
 Ammonitida - Binneyitidae
"Borissiakoceras compressum" = Borissjakoceras
"Borissiakoceras compressum" = Borissjakoceras ammonite
 Ammonitida - Turrilitidae
Turrilites (Eutiirrilites) sp.
Turrilites (Eutiirrilites) sp. Lamarck 1801 ammonite
 Ammonitida - Acanthoceratidae
"Euomphaloceras cf. cunningtoni" = Cunningtoniceras cunningtoni, Conlinoceras gilberti, "Calycoceras leonense" = Calycoceras (Gentoniceras) leonense
"Euomphaloceras cf. cunningtoni" = Cunningtoniceras cunningtoni Sharpe 1855 ammonite
Conlinoceras gilberti Cobban and Scott 1972 ammonite
"Calycoceras leonense" = Calycoceras (Gentoniceras) leonense Adkins 1928 ammonite