from The Century Dictionary and Cyclopedia
- n. Same as peperine.
Sorry, no etymologies found.
Vinalhaven Island in Maine ended up dealing with a lot of these types of deposits ... so, without further ado, the word is peperite!
First order conclusion: It appears that hot basaltic andesite magma interacted with wet, unconsolidated muddy sediment. peperite - magma interacting, sometimes explosively, with wet, unconsolidated sediment, producing a lava flows on the surface can form peperite deposits as well.