East side of Highway 12 (Cretaceous of the United States)

Where: Plymouth County, Iowa (42.6° N, 96.5° W: paleocoordinates 42.6° N, 60.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Greenhorn Limestone Formation, Early/Lower Turonian (93.5 - 89.3 Ma)

• Bottom-most 2 m of the basal Greenhorn Limestone

• group of beds-level stratigraphic resolution

Environment/lithology: lithified limestone

Size class: macrofossils

Collection methods: chemical, acetic

• Repostory: Sternberg Museum of Natural History, Fort Hays State University (FHSM)

Primary reference: K. L. Gorman, K. Shimada, and B. J. Witzke. 2014. Late Cretaceous marine fishes from the basal Greenhorn Limestone in western Iowa. Transactions of the Kansas Academy of Science 117:91-99 [M. Clapham/M. Clapham]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 213400: authorized by Matthew Clapham, entered by Matthew Clapham on 30.08.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Actinopteri
 Pycnodontiformes - Pycnodontidae
? Hadrodus sp. Leidy 1857
 Amiiformes - Caturidae
Caturidae indet. Owen 1860 bowfin
 Teleostei -
Ichthyodectiformes indet. Bardack and Sprinkle 1969
 Crossognathiformes - Pachyrhizodontidae
Pachyrhizodus minimus Stewart 1899
 Aulopiformes - Ichthyotringidae
? Apateodus sp. Woodward 1901
 Aulopiformes - Enchodontidae
Enchodus shumardi Leidy 1856
 Tselfatiiformes - Plethodidae
Plethodidae indet. Loomis 1900
Chondrichthyes
 Hybodontiformes - Ptychodontidae
Ptychodus cf. whipplei Marcou 1858 elasmobranch
 Carcharhiniformes - Scyliorhinidae
? Pteroscyllium sp. Cappetta 1980 cat shark
 Lamniformes - Archaeolamnidae
Archaeolamna cf. kopingensis Davis 1890 mackerel shark
 Lamniformes - Anacoracidae
Squalicorax cf. falcatus Agassiz 1843 crow shark
Squalicorax cf. pawpawensis Siverson et al. 2007 crow shark
 Lamniformes - Cretoxyrhinidae
Cretoxyrhina mantelli Agassiz 1835 mackerel shark
Bivalvia
 Myalinida - Inoceramidae
Mytiloides sp. Brongniart 1822 clam