The strange structures, observable in these rocks, are called algal oncoids and are the result of the deposition of concentric layers of calcium carbonate around fragments of shells or rock, by cyanobacteria. These structures are still being formed today on seabeds characterized by the influence of waves or strong currents. In the Carnic Alps they are located in the Lower Permian of the Val Dolce Formation (the Austrian Grenzland Formation).
- The temporary exhibition “The Wonders of the Underworld – Ampezzo, 20th June 2020
- The Geological Museum in Ampezzo opens next Saturday
- The temporary exhibition “Fossil fish from the Friulian Alps” opens again
- Coronavirus Emergency – extraordinary closing
- Presentation conference – book “INSIDE THE CARNIC ALPS” – Udine, 25th June 2019