Joseph's journal records discovering a "Nephitish alter."
Joseph Smith, Journal, May 19, 1838, Joseph Smith Papers
We next kept up the river mostly in the timber for ten miles, untill we came to Col. Lyman Wight’s who lives at the foot of Tower Hill, a name appropriated by Prest smith, in consequence of the remains of an old Nephitish Alter an Tower, In the after where we camped for the sabath, In the after part of the day, Prest<s.> smith and Rigdon and myself, went to Wights.