However, the presence of many large schist and quartz feature stones in C1 indicates that at least some sources of bedrock were available nearby during the earlier occupation, and the low presence of smooth cortex on quartz debitage in both components indicates procurement from eroded bedrock exposures rather than smaller, weathered ventifacts
In summary, we consider the hypothesis that ventifacts
should necessarily occur in a single interval during the Early Triassic, as proposed by Cassinis et al.
Undoubtedly, as already mentioned, the occurrence of ventifacts is in tune with arid conditions and, with no fossils in the continental successions, they can be interpreted not only as climatic indicators but are also potentially suitable, on account of their stratigraphic position and correlation with other known units, for indicating their presumed age.
In spite of this, because of explaining the presence in the underlying Prato Solaro Member of ventifacts potentially spanning from Griesbachian to Smithian but generally related to the latter times, we felt constrained to invoke that this stratigraphic problem still deserves further study in central Lombardy (Cassinis et al.
in their reply, the ventifacts found in the lowermost beds of the Prato Solaro Member could have originated from this dry climatic regime.
Cassinis et al (2003) have observed scarcely reworked and even in situ ventifacts (paleoreg) in this formation, as well as an eolian dune remnant.
The Triassic succession here also seems to begin with basal conglomerates, which contain many ventifacts at several localities.
In the other western Europe peri-Tethyan basins (Table 1), the Permian-Triassic boundary corresponds to an unconformity that is overlain either by conglomerates containing ventifacts (followed by fluvial sandstones sometimes rich and sometimes totally lacking in paleosols) or directly by fluvial sandstones with the first occurrence of paleosols, and then plants debris and palynomorphs.