The mound building culture at Spiro Oklahoma left behind some wonderful art.  One of those works of art was a buffalo fish riddled with arrows.  I am using this drawing as inspiration for crafting some mound building arrows.  In the mean time I made this whelk shell art replica.  
Charcoal followed by ink.  The Spiro may have grooved their design first then inked it.  I cannot say, I have not seen a museum specimen of this type of work up close.