Glaciers may have moved Stonehenge Altar Stone from Scotland across Dogger Bank to Salisbury Plain

Overview

Stonehenge's Altar Stone origin and transport are analyzed through geochemistry and glacial modeling. The Altar Stone comes from the Orcadian Basin in northeast Scotland, formed from Lake Ocradie sediments, and new modeling explores a glacier-based path via Dogger Bank to Salisbury Plain.

• Altar Stone origin: Orcadian Basin, northeast Scotland
• Stone mass: about 6 tonnes, up to 4 metres long

Introduction

The Altar Stone is the largest of Stonehenge's travelled rocks, weighing around 6 tonnes and measuring about 4 metres in length. A new analysis ties its origin to the Orcadian Basin in northeast Scotland, specifically Lake Ocradie sediments, and tests the possibility that it reached Stonehenge via glacial transport.

Altar Stone origin and travel distance

Geochemical work with Anthony Clarke from the University of Curtin identifies the Altar Stone as sourced from roughly 700 kilometres away, in a region linked to glacially active landscapes. This distance places it among Stonehenge's most distant stones and prompts questions about routes and logistics in the Neolithic.

Glacial transport hypothesis

The researchers tested whether the Altar Stone could have been transported by the last ice age's glacier systems. They model the movement of rocks from the Orcadian Basin toward Dogger Bank, a large east coast topographic high that would have been a natural waypoint along the journey toward Salisbury Plain.

Modeling approach

The team used a numerical model they have been developing to predict the possible deposit locations of glacially transported rocks, or erratics. The results indicate that rocks from the Orcadian Basin could plausibly be deposited near Dogger Bank, making a multi-stage transport to Stonehenge feasible within the post-glacial landscape.

Dogger Bank and Neolithic landscapes

Dogger Bank, formed in part by a large glacial moraine, would have been a local high point in the Doggerland region as ice retreated. The landscape bears archaeological significance, suggesting Neolithic peoples might have selected stones with particular attributes and moved them through shifting environments as sea levels rose after the last glacial maximum.

Implications for Stonehenge and Neolithic mobility

If the Altar Stone traveled by ice first to an intermediate site on Dogger Bank and then 400 kilometres south to Salisbury Plains, the movement pattern for Stonehenge's stones would reflect a higher level of landscape awareness and strategic planning among Neolithic communities than previously assumed.

Conclusion and future directions

The study opens a testable, glacier-based pathway for the Altar Stone and prompts further evidence gathering to confirm intermediate sites and routes. It highlights the potential complexity of Stonehenge's construction logistics and the wider Neolithic exploitation of glacial landscapes.