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The episode title of this section of the Roman Rock Trail isn’t perfect – as we are starting in west Durham in a place called Lanchester, then returning to the Wall at Heddon – a village which owes its position to its hard sandstone bedrock resisting glacial erosion more than the surrounding area. And then onto Benwell. A place not on the current Hadrian’s Wall Trail but from what I hear it will be in the near future. As will the final stop, South Shields Fort – popularly known as Arbeia. On the way we will look at Roman water engineering and perhaps iron production, examine some well exposed sandstone, delve more into the mysteries of the exploitation of coal and finish with a more obscure use of rocks – pigments.

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This episode initially takes us from Chesters on the Wall to Hexham. South of the Wall but very much a gateway and one with some important recycled Roman rocks. Then back to close to the Wall at Fallowfield before jumping back south to Roman Corbridge – Coria or sometimes Corstopitum. The geology will be as diverse as the geography. From the rocks that made millstones to a cavalryman's tombstone,

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All of these podcasts are geological but this episode is three-quarters pure rock. First the plan is to look closely at the rock that provided the mortar for the wall – limestone – did the Romans use it to sweeten these northern soils too – they can be pretty acid. Next its more whin Sill – I am starting to wonder if there’s too much on this rock already, but it does play a huge role in the landscape and on Roman plans and they say you can’t get enough of a good thing. The Whin has a part to play in a trip to Coventinas Well too, but a subtle part. And finally we are off in search of a very modern rock – one that starts soft and goes hard and one the Romans had a very special job for.