Potrerillos Formation, Mexico

Potrerillos Formation
Stratigraphic range: Maastrichtian-Early Paleocene
~70–62 Ma

PreЄ

Type| Formation
Unit of| Difunta Group
Sub-units| Upper Mudstone member
Lithology
Primary| Mudstone
Other| Grainstone
Location
Coordinates|  [ ⚑ ] : 26°00′N 100°48′W﻿ / ﻿26.0°N 100.8°W﻿ / 26.0; -100.8
Paleocoordinates|  [ ⚑ ] 31°42′N 82°42′W﻿ / ﻿31.7°N 82.7°W﻿ / 31.7; -82.7
Region| Coahuila
Country| Mexico

Potrerillos Formation, Mexico (Mexico)

The Potrerillos Formation is a geologic formation in Mexico. It preserves fossils dating back to the Early Paleocene period.[1]

## Contents

* 1 Description
* 2 Fossil content
* 3 See also
* 4 References
* 4.1 Bibliography

## Description

The Potrerillos Formation was subdivided into five members by McBride (1974), with the second highest, the Upper Mudstone Member. Foraminifera in the lower members indicate a Maastrichtian age, while fossils in the upper members indicate a Paleocene age. Fossil remains are abundant and include transported remains of corals, gastropods, bivalves, shark teeth, and bone fragments.[1]

## Fossil content

The following fossils have been reported from the formation:[1]

* Bivalves
* Venericardia (Baluchicardia) francescae[2]
* Venericardia sp.[2]
* Cephalopods
* Cimomia haltomi[2]
* Elimia cf. trigemmata[2]

## See also

* List of fossiliferous stratigraphic units in Mexico

## References

1. ↑ 1.0 1.1 1.2 Potrerillos Formation at Fossilworks.org
2. ↑ 2.0 2.1 2.2 2.3 Vega & Perrilliat, 1995

### Bibliography

* Vega, F.J.; Perrilliat, M.D.C. (1995), "On some Paleocene invertebrates from the Potrerillos Formation (Difunta Group), northeastern Mexico", Journal of Paleontology 69 (5): 863–869, doi:10.1017/S0022336000035538, Bibcode: 1995JPal...69..862V

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