Charles Bonner Ranch (Cretaceous to of the United States)

Where: Logan County, Kansas (38.9° N, 101.2° W: paleocoordinates 44.5° N, 71.1° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Bacculites sp. (weakly ribbed) to Baculites perplexus ammonoid zone, Sharon Springs Member (Pierre Shale Formation), Early/Lower Campanian to Early/Lower Campanian (83.5 - 70.6 Ma)

• "at the base of the Pierre Shale [Sharon Springs Member, Campanian]"

•The SHaron Springs Member in Kansas ranges from Bacculites sp. (weakly ribbed) - Baculites perplexus biozones (Early-Middle Campanian)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified lithology not reported

• clearly lithified based on preservation of specimen

Size class: macrofossils

• "largely articulated skeletal remains of two plesiosaur individuals"

Collected by C. Bonner in 1987; reposited in the LACM

Collection methods: quarrying,

Primary reference: F. R. O'Keefe and L. M. Chiappe. 2011. Viviparity and K-selected life history in a Mesozoic marine Plesiosaur (Reptilia, Sauropterygia. Science 333(870):870-873 [J. Alroy/J. Alroy/R. Benson]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 114240: authorized by John Alroy, entered by John Alroy on 12.08.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

 Sauropterygia - Polycotylidae
"Polycotylus latippinus" = Polycotylus latipinnis
"Polycotylus latippinus" = Polycotylus latipinnis Cope 1869 plesiosaur
LACM 129639 consists of the largely articulated skeletal remains of two plesiosaur individuals, an adult and a juvenile displaying features at very early stages of development