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Since the last episode we and the river have flowed past Newbrough with its definite Roam road and indefinite Roman fort and go and on through Hexham. Both places described in previous episodes. The Tyne is now a single river. Waters meet was passed at Acomb. Hexham is worth a pause anyway. Its fine Abbey and medieval buildings – many made with robbed – sorry repurposed – Roman Stone described in series 3. from Corbridge also passed and its Roman Town Coria or Corstopitum - with its main street made of cobbles from the River Tyne - The remaining Roman stones of its immense granaries and town buildings are a fraction of what was there after those medieval builders robbed the town to construct Hexham! Riding Mill and Stocksfield are behind us as well and we are now near Mickley, Eltringham to be precise.

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We begin quite a way up the South Tyne Valley – appropriately at a place called Tynehead to try to get to the bottom of the many stories about the Romans and silver mining in the north. The metals theme continues with stops and stories at a prehistoric barrow at Kirkhaugh and a Roman fort thought by some but not all to be positioned to protect Roman state lead mining. The episode ends beside the South Tyne at Beltingham - which tells a different story about mining metals in the North Pennines.

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This is a journey from moors above the middle reaches of the River Tees near Barnard Castle to its mouth where it empties into Hartlepool Bay. Along the way the plan is to look at some prehistoric rock art at Barningham, celebrate the merits of sand and gravel and a hear a cautionary tale about flood risk, revisit the salt deposits of Teesside and in Hartlepool Bay hear about some graphic evidence of times when our coastline was very different

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The first of our journeys is along the River Tees. The Tees has its headwaters way up in the Pennines, in the Carboniferous rocks just east of Cross Fell, but downstream of Cow Green Reservoir it cuts through some of the oldest rocks in Northern England – that’s why its the first or the rivers in this series. On our way downstream we will explore some different bits of the Whin Sill and some rocks it baked, the making pencils from ancient slates and take a closer look at High and Low Force, iconic sites of the Northern landscape. But let’s head for Widdybank Fell near the dam at Cow Green.

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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.

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Time to descend into and out of one of the classic components of this frontier landscape - one of the "gaps". You have already experienced a few and today there will be a few more. But your legs need a break so we are going to deviate south of the Wall too. To see a ditch, then go find about two mineral resources that were used extensively by the Romans - coal and iron - but what do we know about them.