Passing the crag is Blackstone Edge Long Causeway, also known as Blackstone Edge Roman Road, a paved road originally thought to be of Roman origin.
After investigations by James Maxim it is now considered to be a 1735 turnpike or packhorse route.
The Aiggin Stone, a gritstone pillar, possibly a way-marker, stands alongside the packhorse route and marks the county boundary.
The stone has a cross and the letters I and T cut into it.
Its name is said to derive from the French aiguille for a needle or aigle for an eagle.

Much of the surrounding area was within the ancient parish of Hundersfield, although some parts lay within Butterworth township.
In the English Civil War the Parliamentarians sent 800 men to fortify Blackstone Edge; John Rosworm came from Manchester to direct the construction of defences.
It was successfully held against an attack by Royalist cavalry.
In 1660 the churchwardens of St Chad's paid 24 shillings for eight loads of "great stones from Blackstoneedge" for Rochdale church steps.

Celia Fiennes travelled over Blackstone Edge and described her journey in about 1700.
A meeting of supporters of Chartism from the surrounding industrial towns of Lancashire and Yorkshire was held in 1846, attracting up to 30,000 people.
Passing the crag is Blackstone Edge Long Causeway, also known as Blackstone Edge Roman Road, a paved road originally thought to be of Roman origin. After investigations by James Maxim it is now considered to be a 1735 turnpike or packhorse route. The Aiggin Stone, a gritstone pillar, possibly a way-marker, stands alongside the packhorse route and marks the county boundary. The stone has a cross and the letters I and T cut into it. Its name is said to derive from the French aiguille for a needle or aigle for an eagle.
Much of the surrounding area was within the ancient parish of Hundersfield, although some parts lay within Butterworth township. In the English Civil War the Parliamentarians sent 800 men to fortify Blackstone Edge; John Rosworm came from Manchester to direct the construction of defences. It was successfully held against an attack by Royalist cavalry. In 1660 the churchwardens of St Chad's paid 24 shillings for eight loads of "great stones from Blackstoneedge" for Rochdale church steps. 
Celia Fiennes travelled over Blackstone Edge and described her journey in about 1700. A meeting of supporters of Chartism from the surrounding industrial towns of Lancashire and Yorkshire was held in 1846, attracting up to 30,000 people.
Blackstone Edge