33Fossil sites
Halla Formation
Halla Formation in Sweden: 33 fossil sites. Typical age: 431–427 million years (Silurian).
33Fossil sites
3Finds
431–427 million yearsTypical age
SilurianMain period
Where its fossils were found
Silurian
By geological period
Silurian33
What was found
Trilobites · 3Exallaspis, Kettneraspis
Towns with the most fossil sites nearby
Other formations of the same period
Silurian
Sundre Formation 75Hamra Formation 67När Formation 65Burgsvik Formation 38Etelhem Formation 37Hemse Beds 34Högklint Formation 30Petes Formation 28Klinteberg Formation 24Lower Visby Formation 20Upper Visby Formation 19Slite Beds 18Eke Formation 18Slite Formation 16Klinteberg Beds 14Lower Visby Beds 12Hemse Formation 12Halla Beds 9Upper Visby Beds 9Mulde Formation 9Eke Beds 8Hamra Beds 8Hogklint Beds 6Burgsvik Beds 6