Mexcala Formation (Cretaceous of Mexico)

Where: Mexico (19.4° N, 99.1° W: paleocoordinates 21.9° N, 71.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Mexcala Formation, Coniacian (89.8 - 86.3 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; lithified limestone and lithified shale

• Thinly bedded limestones or limey siltstones that grades upwards into an upper member composed of a sequence of shale and sandstone, and minor conglomeratic beds.

Primary reference: E. Cabral-Cano, H. R. Lang, and C. G. A. Harrison. 2000. Stratigraphic Assessment of the Arcelia-Teloloapan area, Southern Mexico: Implications for Southern Mexico's Post-Neocomian Tectonic Evolution. Journal of South American Earth Science 13:443-457 [A. Miller/D. Schramm/D. Schramm]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 42274: authorized by Arnold Miller, entered by Danielle Schramm on 27.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Foraminifera
 Globigerinaceae - Globotruncanidae
Globotruncana rioensis, Globotruncana sp., Globotruncana rosseta, Marginotruncana sp.
Globotruncana sp. Cushman 1927
Tubothalamea
 Miliolida - Hauerinidae
Quinqueloculina sp.
Quinqueloculina sp. d'Orbigny 1826
 Miliolida - Miliolidae
Pyrgo cf. sp.
Pyrgo cf. sp. Defrance 1824
Foraminifera
 Globigerinina - Rotaliporidae
Rotalipora sp.
Rotalipora sp. Brotzen 1942
 Globigerinina - Hedbergellidae
Praeglobotruncana rioensis
Cephalopoda
 Ammonitida - Collignoniceratidae
Peroniceras aff. tricarinatum, Peroniceras cf. subtricarinatun, Peroniceras sp., Barroisiceras cf. alstadenense, Barroisiceras sp.
Peroniceras sp. de Grossouvre 1894 ammonite
Barroisiceras sp. de Grossouvre 1894 ammonite