HOME Fossil Locations Sierra Chacaico, Argentina
Facebook Fossiel.net In English Please In het Nederlands


Contribute knowledge and information to Fossiel.net!
How can I help?

Most Popular Fossil Locations

Fossil from Fossil ID system

Opal Ethiopia middle in box
3.50 EUR

  Sierra Chacaico


Last Modified:

>> View All Locations
This location is closed or not accessible anymore !!!

Location description

The Sierra Chacaico is a moutain ridge that comprises fossil rich deposits dating from the Lower Bajocian (Middle Jurassic). These deposits are part of the Neuquén Basin, in western-central Argentian. Especially the area South of the town of Zapala is famous for the ammonite bearing deposits

A well-known locality is the eastern flank of the Charahuilla valley, where ammonite-rich deposits of the Lajas Formation of the Cuyo Group are exposed.

These days, it is no longer allowed to export fossils from Argentina.

Do you have (more) photographs of this location? Please send your photographs using the Fossil Location Photo form!


The ammonite rich outcrops can be found at the cliffs east of the small river the Arroyo Charahuilla, east of the road from Melipil to Charahuilla. 

The layered deposits of the Lajas Formation are easily recognizable from the road. To reach the outcrops one has to go down from the road by foot, cross the stream and walk up the slope on the other side.

Drag the map and zoom in or out for the best view of this locality.


The deposits of the Lajas Formation are exeptionally rich in ammonites. Especially the softer, marly layers are very rich. In the harder bed it is well worth to brake open the calcareous concretions.

Literature recommended by members

  • Dietze et al., 2012: Ammonites and stratigraphy of a Lower Bajocian (Middle Jurassic) section in the Sierra Chacaico (Neuquén Basin, Argentina).
    Zitteliana 52, 119-140
    Added by FossilDude

Do you have (more) literature suggestions for this location? Please send your suggestion using the Literature form!

Other locations in the area

No locations were found in the region. Do you know a new location? Please report Here.


Everybody using the fossil collecting location descriptions from this site has to respect the Collecting Code!
Search the Forum to find recent messages about this location.
Do you have additional info or corrections? REPORT