Early Cambrian small carbonaceous fossils (SCFs) from an impact crater in western Finland

We describe an assemblage of small carbonaceous fossils (SCFs) and acritarchs from cored siltstones of the Lappajärvi impact structure, west-central Finland. Previous studies had detected a depauperate acritarch biota ascribed to a deep Proterozoic origin—this age, however, was based on recovery of long-ranging poorly age-diagnostic sphaeromorphs. To resolve the age and provenance of these crater sediments, we applied low-manipulation processing...