Chronister well (Cretaceous of the United States)

Where: Bollinger County, Missouri (37.3° N, 90.0° W: paleocoordinates 41.1° N, 65.9° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: McNairy Sand Member (Ripley Formation), Maastrichtian (72.1 - 66.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: karst; poorly lithified, black, blue claystone

• clays in a filled sink into Ordovician rocks
• "clay, blue to black, very plastic"

Size classes: macrofossils, mesofossils

Collected by D. Stewart, M. Mehl in 1940-1942, 1972; reposited in the USNM

Collection methods: core, quarrying, mechanical,

Primary reference: E. B. Branson. 1942. Dinosaur from the Cretaceous of Missouri. Bulletin of the Geological Society of America 53:1841 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 45679: authorized by Matthew Carrano, entered by Matthew Carrano on 23.11.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Hybodontiformes - Hybodontidae
Hybodontidae indet.1 Agassiz 1843 elasmobranch
 Euselachii -
 Amiiformes - Amiidae
Amiidae indet.1 Huxley 1861 bowfin
 Lepisosteiformes - Lepisosteidae
Lepisosteidae indet.1 Cuvier 1825 gar
 Testudines - Adocidae
Adocus sp.3 Cope 1868 turtle
 Testudinata - Helochelydridae
Naomichelys sp.3 Hay 1908 turtle
 Avetheropoda - Tyrannosauridae
Albertosaurus sp.3 Osborn 1905 Alberta lizard
 Neornithischia - Hadrosauridae
Hadrosauridae indet.1, "Parrosaurus missouriensis n. gen." = Neosaurus missouriensis2
Hadrosauridae indet.1 Cope 1869 hadrosaurid
"Parrosaurus missouriensis n. gen." = Neosaurus missouriensis2 Gilmore and Stewart 1945 hadrosaurid
 Loricata -
Crocodylia indet.1 crocodilian