Blood and Honour: The Podcast
Segontium - Reading the Menai Landscape Geological Foundation Segontium sits on Ordovician volcanic rocks dating to 450 million years ago, part of the ancient Snowdonia volcanic complex. The fort was built on a natural terrace of igneous bedrock that provided excellent drainage and a stable foundation for stone buildings. The elevated position (50m above sea level) offers commanding views across the Menai Strait, a glacially-carved channel that separates mainland Wales from Anglesey. Walking the Roman Approach Routes Starting Point: Segontium Roman Fort Museum (SH485624) OS Map: Explorer OL17 Snowdon Route 1: Following the Roman Road to Caernarfon From the museum, walk southeast toward Caernarfon town centre. This route follows the approximate line of the Roman road that connected Segontium to the harbour. Look for: Elevation changes: Notice how the Roman engineers chose a gentle gradient down to the waterfront Stone walls: Many contain reused Roman masonry from Segontium Field boundaries: Several follow the Roman road alignment What to Look For: Roman masonry: In Caernarfon Castle walls - look for the distinctive red sandstone blocks with Roman tooling marks Natural terraces: The Romans built on a natural shelf in the hillside, visible as you approach from below Drainage patterns: Roman engineers diverted natural springs - you can still see stone-lined channels Route 2: The Sarn Helen Connection Walk northeast from Segontium toward Bontnewydd (1.5 miles). This section follows part of Sarn Helen, the great Roman road network across Wales. Waymarks to Identify: Raised causeway: About 800m northeast of the fort, look for a slight elevation in the field - this is the agger of Sarn Helen Straight field boundaries: Roman roads maintain their alignment even when plowed over Stone scatter: Look for dressed stone blocks in field edges - often robbed Roman road material Geological Clues Glacial erratic's: Large boulders scattered across fields show ice movement patterns that Romans had to work around Spring lines: Where water emerges from hillsides - Romans always built near reliable water sources Bedrock exposure: On clear days, you can see the geological "grain" of Snowdonia - the Romans aligned their roads to work with, not against, this natural pattern
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