shale - student specimens of a siliceous Miocene shale, a subunit of the Monterey Formation - Unit of 5 student specimens
The Altamira Shale is a Middle Miocene mudstone found in the Monterey Shale, known for its hardness and resistance to crumbling during student examinations.
- The description claims that the Altamira Shale is more resistant to crumbling than fissile shales.
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