Portland A MYSTERIOUS CAVE FOUND.;December 27, 1896,

[jeff of pa]

http://query.nytimes.com/mem/archive-free/pdf?res=9B0DE2DE113BEE33A25754C2A9649D94679ED7CF

 

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[oregongold.net]

Sounds like a sacred place that was used by Native American Medicine Men. The Mortal and Pestle would have been used on grinding herbs, medicines or hallucinogens.