: The formation also contains tuff beds (volcanic ash) and porcellanites , which suggest ancient volcanic activity in the region during its deposition. 2. Oral Warty Dyskeratoma (Medicine)
: It typically appears as a small, white, nodular lesion with a central depressed area, often described as a "crater" or "crypt". : The formation also contains tuff beds (volcanic
: Researchers have identified helically coiled microfossils ( Obruchevella ) within these shales, which helps scientists estimate the age of the basin as being close to the Ediacaran or Cambrian periods. : The formation also contains tuff beds (volcanic
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