T/V 6 (Jurassic to of Mexico)

Where: Hidalgo, Mexico (20.3° N, 98.2° W: paleocoordinates 3.7° N, 47.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Semicostatum ammonoid zone, Huayacocotla Formation, Early/Lower Sinemurian to Early/Lower Sinemurian (196.5 - 189.6 Ma)

• Ammonoid zones: from Semicostatum Zone up to Middle Raricostatum Zone

Environment/lithology: basinal (siliceous); lithified sandstone

Size class: macrofossils

Preservation: cast, mold/impression

Collection methods: surface (in situ)

• the collections of the Instituto de Geología of Mexico (UNAM).

Primary reference: C. Meister, J. Blau, J.-L. Dommergues, R. Schlatter, R. Schmidt-Effing and K. Burk. 2005. Ammonites from the Lower Jurassic (Sinemurian) of Tenango de Doria (Sierra Madre Oriental, Mexico). Part IV: Biostratigraphy, palaeobiogeography and taxonomic addendum. Revue de Paléobiologie 24(1):365-384 [J. Pálfy/D. Juhász]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 208370: authorized by József Pálfy, entered by Dorina Juhász on 01.04.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Phylloceratida - Phylloceratidae
Calliphylloceras sp. Spath 1927 ammonite
Phylloceras sp. Suess 1865 ammonite
Partschiceras sp. Fucini 1920 ammonite
 Phylloceratida - Juraphyllitidae
Juraphyllites nardii Meneghini 1853 ammonite
 Ammonitida - Eoderoceratidae
Eoderoceras sp. Spath 1925 ammonite
 Ammonitida - Lytoceratidae
Ectocentrites leslei, "Aegolytoceras sp." = Alocolytoceras
"Aegolytoceras sp." = Alocolytoceras Hyatt 1900 ammonite
 Ammonitida - Echioceratidae
 Ammonitida - Arietitidae
 Ammonitida - Oxynoticeratidae
Oxynoticeratidae sp. Hyatt 1875 ammonite