They are on the roof of Thomas Jefferson's house (7 o'clock, 1776 AD). When you return the rocks to 1387 AD, go to the Timbuktu Inn (far right) where you can get the Declaration of Independence for Jefferson.
In 1776 AD, jump up on the Graff House window ledges until you get all the way to the top. The rock salt (a tan bag of white rocks) will be on the roof.
The rocks are in the viking times, and they are up blocking a cave. You have to get gunpowder from the china times, and blow open the caves. Then, you will get a torch and go through the caves.
To blast open the rock cave at 831 AD, get the barrel of gunpowder from the Great Wall of China (1593 AD, 6 o'clock on the time device). It is to the right side of the Wall.
go to the african one and if you go on the roof, you will see a man looking for his salt rocks
To the upper left, atop the building, is the owner of the rocks.
There is a bag of Salt Rocks on the roof of the house at 1776 AD. Take it to the man at the upper left in 1387 AD.
Go to 1776 AD, and climb the red house (Graff House) to the roof. In one of the chimneys is the bag of salt rocks for 1387 AD.
They go to 1387 AD (1 o'clock on the time device), to the man on the building at upper left.
Jump on the rocks.
on a roff at john adoms
The salt rocks on the roof at 1776 AD go to the guy on the roof at 1387 AD (3 o'clock on the time device). Jefferson's missing Declaration is at the Timbuktu Inn to the right side.
The Salt Rocks for 1387 AD on on top of the Graff House (Thomas Jefferson's residence) in 1776 AD. (Jefferson's Declaration is, conversely, at the Timbuktu Inn at 1387 AD.)
Thomas Jefferson is at 1776 AD on Time Tangled Island (7 o'clock on the time device). His Declaration of Independence is at the Timbuktu Inn at 1387 AD (3 o'clock on the time device). The salt rocks for 1387 AD are on the roof of Jefferson's residence.
you beat the rest what else do you do
The salt rocks for 1387 AD are on the roof of the Graff House in 1776 AD, where Thomas Jefferson is looking for his draft of the Declaration of Independence. The document is at the Timbuktu Inn at 1387 AD, making this a "direct swap" of items.