Definition of "tosca" []

• A name given in parts of South America, especially near the mouth of the La Plata river, and in the region of the pampas generally, to a soft concretionary limestone, having about the consistence of slightly baked clay, and of a dark-brown color. It underlies the so-called Pampean formation. (noun)

The Century Dictionary (Public Domain)

• "Where there are large cakes of "tosca" near the surface, as in many localities on the southern pampas, the vizcacha makes its burrow as best he can, and without the regular trenches."
• "Often, where the ground is soft, there are twenty or thirty or more burrows in an old vizcachera; but on stony, or "tosca" soil even an old one may have no more than four or five burrows."
• "Thanks , Mussitate , for your kind introduction - I hope that your warm blue tosca wasn't too cold !"