Where: Sonora, Mexico (30.6° N, 112.6° W: paleocoordinates 18.3° N, 55.1° W)
• coordinate estimated from map
• local area-level geographic resolution
When: Leslei ammonoid zone, Lower Jurassic upper Member (Sierra de Santa Rosa Formation), Early/Lower Sinemurian (196.5 - 189.6 Ma)
• Sequence XI, informal unit 18
Environment/lithology: deep-water; lithified, argillaceous mudstone and lithified siltstone
Size class: macrofossils
Preservation: cast, mold/impression
Collection methods: surface (in situ)
• Estación Regional del Noroeste (ERNO), Instituto de Geología,Universidad Nacional Autónoma de México collection
Primary reference: D. Szűcs, C. M. González-León, and J. Pálfy. 2019. Ammonoid biostratigraphy and paleobiogeography of Lower Jurassic sections from Sonora (northwest Mexico) and their tectonic implications. Journal of South American Earth Sciences 93:267-282 [J. Pálfy/D. Juhász/P. Wagner]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 208240: authorized by József Pálfy, entered by Dorina Juhász on 25.03.2020
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
"Phylloceras cf. costatoradiatum" = Partschiceras tenuistriatum
"Phylloceras cf. costatoradiatum" = Partschiceras tenuistriatum Meneghini 1868 ammonite | |
Arnioceras aff. arnouldi, "Arnioceras aff. humboldti" = Arnioceras ceratitoides, Coroniceras aff. gaudryi, Coroniceras sp.
Arnioceras aff. arnouldi Dumortier 1867 ammonite
"Arnioceras aff. humboldti" = Arnioceras ceratitoides Quenstedt 1848 ammonite
Coroniceras aff. gaudryi ammonite
Coroniceras sp. Hyatt 1867 ammonite | |
Caenisites aff. brooki Sowerby 1818 ammonite |