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...cast in aluminium using established foundry practices. A well-made cast aluminium mould can be used to produce up to 10 000 injection mouldings in glass fibre reinforced nylon without unacceptable wear. Such a tool typically costs under £3000 compared with many times that cost for a hardened steel production tool. Moulds can alternatively be made out of low melting point...

...sand, and the rocks require close inspection. We discuss what we can see and where best to do our investigations. Those discussions are important because our resources are limited. We can pick one or two of those rocks for closer inspection, thus we spend some time discussing. We point out structures and colour changes to each other and develop a hierarchy of what is most...

...sand became sandstones, some containing pebbles, which later became conglomerates. Lapping the coast was a warm tropical sea with corals, primitive fish and some very large brachiopod shells as well as microscopic shelled animals. The shells and skeletons of these animals are found fossilised in the limestones of Fermanagh. Coastal swamps and giant fern forests later...