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: Carinatum ammonoid zone, Lower Jurassic upper Member (Sierra de Santa Rosa Formation), Late/Upper Sinemurian (196.5 - 189.6 Ma)
• Sequence XII, informal unit 19
Environment/lithology: deep-water; lithified, massive mudstone
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 208244: authorized by József Pálfy, entered by Dorina Juhász on 25.03.2020
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
Epophioceras sp. Spath 1924 ammonite
Epophioceras cf. longicella Quenstedt 1885 ammonite | |
"Phylloceras cf. frondosum" = Phylloceras hebertinum
"Phylloceras cf. frondosum" = Phylloceras hebertinum Reynes 1868 ammonite |