PBDB Collection

Trachyscaphites spiniger ammonite fauna (Cretaceous of the United States)

Also known as USGS Mesozoic locality D10154

Where: Fannin County, Texas (33.4° N, 96.0° W: paleocoordinates 38.0° N, 67.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• "ome 46 m above the base" of the Ozan Formation

•"lower upper Campanian in a north-west European sense"

• bed-level stratigraphic resolution

Environment/lithology: marine; glauconitic, phosphatic, shelly/skeletal, green marl

• "a distinctive glauconitic unit at most a few tens of centimetres thick that overlies a marked omission surface that can be traced widely in the subsurface... a red-weathering, green, glauconitic marl rich in bioclasts. The bed is crowded with black phosphate nodules [containing fossils]"

Size class: macrofossils

Preservation: original aragonite

Collected by J. P. Conlin, W. A. Cobban, R. E. Burkholder; reposited in the USNM

Primary reference: W. A. Cobban and W. J. Kennedy. 1992. Campanian Trachyscaphites spiniger ammonite fauna in north-east Texas. Palaeontology 35(1):63-93 [J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 73635: authorized by John Alroy, entered by John Alroy on 22.06.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

• "bivalves, gastropods and vertebrate debris are the commonest faunal elements" but are not identified

•many specimens are fragmentary, but this is not indicated consistently and multiple specimens are apparently unlikely to be parts of the same individual

Show authors, comments, and common names

Cephalopoda
Ammonitida - Placenticeratidae	Placenticeras sp. Placenticeras sp. Meek 1876 ammonite fragments
Ammonitida - Collignoniceratidae	Menabites (Delawarella) sp., Menabites (Delawarella) vanuxemi, Menabites (Delawarella) danei, Menabites (Delawarella) delawarensis Menabites (Delawarella) sp. Collignon 1948 ammonite Menabites (Delawarella) vanuxemi Morton 1830 ammonite Menabites (Delawarella) danei Young 1963 ammonite Menabites (Delawarella) delawarensis Morton 1830 ammonite
Ammonitida - Pachydiscidae	Pachydiscus (Pachydiscus) paulsoni, Eupachydiscus grossouvrei Pachydiscus (Pachydiscus) paulsoni Young 1963 ammonite Eupachydiscus grossouvrei Kossmat 1898 ammonite
Ammonitida - Scaphitidae	"Scaphites (Scaphites) ex gr. hippocrepis" = Scaphites hippocrepis, Trachyscaphites spiniger, Trachyscaphites densicostatus n. sp. "Scaphites (Scaphites) ex gr. hippocrepis" = Scaphites hippocrepis DeKay 1828 ammonite "group of hippocrepis": "two small fragments" Trachyscaphites spiniger Schlüter 1872 ammonite "Trachyscaphites spiniger spiniger": 18 specimens are fragments Trachyscaphites densicostatus n. sp. Cobban and Kennedy 1992 ammonite
Ammonitida - Diplomoceratidae	Glyptoxoceras sp. Glyptoxoceras sp. Spath 1925 ammonite fragments
Ammonitida - Baculitidae	Baculites ex gr. aquilaensis Baculites ex gr. aquilaensis Reeside 1927 ammonite "group of aquilaensis": "more than 100 fragments"